TY  - JOUR
AU  - Raković, Milan
AU  - Radenković, Darko
AU  - Ćoćić, Aleksandar
AU  - Lečić, Milan
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3693
AB  - In this work, numerical simulations of upward turbulent bubbly flows in vertical pipes are conducted in the Euler-Euler framework with a low-Reynolds-number (LRN) model for liquid. It is found that the existing correlation for the drag coefficient of a single bubble in a shear flow, which has been successfully used along with the high-Reynolds-number (HRN) models, cannot be used with the LRN model. The reason is that drag forces of bubbles calculated using such correlation are enormous in near-wall cells (order of 10(12) N/m(3)), which causes a divergence of numerical simulations with LRN. Therefore, a modified correlation for the drag coefficient of a single bubble in shear flow, that can be used successfully with the LRN model, has been proposed. The results of numerical simulations, performed with a new correlation for the drag coefficient, are analysed and compared to selected experimental measurements for different pipe diameters and different flow conditions of gas and liquid. It is shown that the largest effect of the application of the new correlation for the drag coefficient of a single bubble in shear flow in numerical simulations can be achieved on the reduction of the relative velocity between gas and liquid. The degree of this reduction depends on the pipe diameter and liquid volumetric flux.
PB  - Sage Publications Ltd, London
T2  - Advances in Mechanical Engineering
T1  - Euler-Euler numerical simulations of upward turbulent bubbly flows in vertical pipes with low-Reynolds-number model
IS  - 4
VL  - 14
DO  - 10.1177/16878132221094909
ER  - 

@article{
author = "Raković, Milan and Radenković, Darko and Ćoćić, Aleksandar and Lečić, Milan",
year = "2022",
abstract = "In this work, numerical simulations of upward turbulent bubbly flows in vertical pipes are conducted in the Euler-Euler framework with a low-Reynolds-number (LRN) model for liquid. It is found that the existing correlation for the drag coefficient of a single bubble in a shear flow, which has been successfully used along with the high-Reynolds-number (HRN) models, cannot be used with the LRN model. The reason is that drag forces of bubbles calculated using such correlation are enormous in near-wall cells (order of 10(12) N/m(3)), which causes a divergence of numerical simulations with LRN. Therefore, a modified correlation for the drag coefficient of a single bubble in shear flow, that can be used successfully with the LRN model, has been proposed. The results of numerical simulations, performed with a new correlation for the drag coefficient, are analysed and compared to selected experimental measurements for different pipe diameters and different flow conditions of gas and liquid. It is shown that the largest effect of the application of the new correlation for the drag coefficient of a single bubble in shear flow in numerical simulations can be achieved on the reduction of the relative velocity between gas and liquid. The degree of this reduction depends on the pipe diameter and liquid volumetric flux.",
publisher = "Sage Publications Ltd, London",
journal = "Advances in Mechanical Engineering",
title = "Euler-Euler numerical simulations of upward turbulent bubbly flows in vertical pipes with low-Reynolds-number model",
number = "4",
volume = "14",
doi = "10.1177/16878132221094909"
}

Raković, M., Radenković, D., Ćoćić, A.,& Lečić, M.. (2022). Euler-Euler numerical simulations of upward turbulent bubbly flows in vertical pipes with low-Reynolds-number model. in Advances in Mechanical Engineering
Sage Publications Ltd, London., 14(4).
https://doi.org/10.1177/16878132221094909

Raković M, Radenković D, Ćoćić A, Lečić M. Euler-Euler numerical simulations of upward turbulent bubbly flows in vertical pipes with low-Reynolds-number model. in Advances in Mechanical Engineering. 2022;14(4).
doi:10.1177/16878132221094909 .

Raković, Milan, Radenković, Darko, Ćoćić, Aleksandar, Lečić, Milan, "Euler-Euler numerical simulations of upward turbulent bubbly flows in vertical pipes with low-Reynolds-number model" in Advances in Mechanical Engineering, 14, no. 4 (2022),
https://doi.org/10.1177/16878132221094909 . .

TY  - CONF
AU  - Raković, Milan
AU  - Radenković, Darko
AU  - Ćoćić, Aleksandar
AU  - Lečić, Milan
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6219
AB  - Numerical simulations of upward turbulent bubbly flows in vertical pipes are carried
out in the Euler-Euler framework with a low-Reynolds-number (LRN) model for liquid for
various flow conditions. It is found that the correlation for the drag coefficient of a single
bubble in a shear flow, which has been successfully used in numerical simulations with
the high-Reynolds-number (HRN) models, cannot be used with the LRN model. The
reason is an excessive value of drag coefficient of a single bubble in the near-wall cells.
Therefore, a new correlation for the drag coefficient of a single bubble in shear flow has
been proposed. The results of numerical simulations are analysed and compared to
selected experiment results. It is shown that the largest effect of the application of the
new correlation for the drag coefficient of a single bubble in shear flow can be achieved
on the reduction of the relative velocity between gas and liquid. Overall, the results of
numerical simulations agree well with the experimental results.
C3  - ICAS 2022 Book of abstracts
T1  - Influence of the drag coefficient of a single bubble in vertical upward turbulent bubbly flows
SP  - 85
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6219
ER  - 

@conference{
author = "Raković, Milan and Radenković, Darko and Ćoćić, Aleksandar and Lečić, Milan",
year = "2022",
abstract = "Numerical simulations of upward turbulent bubbly flows in vertical pipes are carried
out in the Euler-Euler framework with a low-Reynolds-number (LRN) model for liquid for
various flow conditions. It is found that the correlation for the drag coefficient of a single
bubble in a shear flow, which has been successfully used in numerical simulations with
the high-Reynolds-number (HRN) models, cannot be used with the LRN model. The
reason is an excessive value of drag coefficient of a single bubble in the near-wall cells.
Therefore, a new correlation for the drag coefficient of a single bubble in shear flow has
been proposed. The results of numerical simulations are analysed and compared to
selected experiment results. It is shown that the largest effect of the application of the
new correlation for the drag coefficient of a single bubble in shear flow can be achieved
on the reduction of the relative velocity between gas and liquid. Overall, the results of
numerical simulations agree well with the experimental results.",
journal = "ICAS 2022 Book of abstracts",
title = "Influence of the drag coefficient of a single bubble in vertical upward turbulent bubbly flows",
pages = "85",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6219"
}

Raković, M., Radenković, D., Ćoćić, A.,& Lečić, M.. (2022). Influence of the drag coefficient of a single bubble in vertical upward turbulent bubbly flows. in ICAS 2022 Book of abstracts, 85.
https://hdl.handle.net/21.15107/rcub_machinery_6219

Raković M, Radenković D, Ćoćić A, Lečić M. Influence of the drag coefficient of a single bubble in vertical upward turbulent bubbly flows. in ICAS 2022 Book of abstracts. 2022;:85.
https://hdl.handle.net/21.15107/rcub_machinery_6219 .

Raković, Milan, Radenković, Darko, Ćoćić, Aleksandar, Lečić, Milan, "Influence of the drag coefficient of a single bubble in vertical upward turbulent bubbly flows" in ICAS 2022 Book of abstracts (2022):85,
https://hdl.handle.net/21.15107/rcub_machinery_6219 .

TY  - JOUR
AU  - Burazer, Jela M.
AU  - Novković, Đorđe 
AU  - Ćoćić, Aleksandar
AU  - Bukurov, M.
AU  - Lečić, Milan
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3713
AB  - Vortex tube is a device without moving parts with ability to separate pressurized gas into two streams: cold and hot. This is a consequence of the Eckert-Wiese effect, which is responsible for spontaneous redistribution of total energy within the flow domain. In order for vortex tubes to work properly, there are some constraints which have to be fulfilled. The most important constraint in that sense is the L/D ratio. One part of this paper is dedicated to the research of the influence of L/D ratio on the energy separation in a vortex tube, i.e. to the values of total temperatures on cold and hot outlets of the device. On the other hand, experimental research of the inner flow is quite challenging since vortex tube is a device of small dimensions. Hence, we are relaying on numerical computations. One of important quantities that has to be prescribed in these computations is the turbulent Prandtl number Pr-T. Because of that, the other part of this paper is dedicated to research of the influence of Pr-T on the results of numerical computations. The research is conducted using open-source software OpenFOAM. Turbulence is modelled using two-equation and RST models. For small L/D ratios there is a secondary circulation that acts as a refrigeration cycle, and for greater L/D ratios distribution of velocity and temperature inside the vortex tube remains the same, regardless of the stagnation point presence. It is not justified to increase the length of the vortex tube beyond 20D since the change in cold total temperature inside the vortex tube as well at the cold outlet is practically null. For L/D variation from 1.8 to 10, the cold outlet temperature changes from 270.9 K to 266.8 K, and then rises to its final value of 270.5 K. For L/D ratio from 20 to 60, the total temperature at cold end remains unchanged at 271.3 K. We obtained good results with the unit value of turbulent Prandtl number, and demonstrated that increasing the Pr-T beyond unit value is not necessary in order to numerically obtain the energy separation inside the vortex tube.
PB  - Isfahan Univ Technology, Isfahan
T2  - Journal of Applied Fluid Mechanics
T1  - Numerical Study of the L/D Ratio and Turbulent Prandtl Number Effect on Energy Separation in a Counter-Flow Vortex Tube
EP  - 1511
IS  - 5
SP  - 1503
VL  - 15
DO  - 10.47176/jafm.15.05.1168
ER  - 

@article{
author = "Burazer, Jela M. and Novković, Đorđe  and Ćoćić, Aleksandar and Bukurov, M. and Lečić, Milan",
year = "2022",
abstract = "Vortex tube is a device without moving parts with ability to separate pressurized gas into two streams: cold and hot. This is a consequence of the Eckert-Wiese effect, which is responsible for spontaneous redistribution of total energy within the flow domain. In order for vortex tubes to work properly, there are some constraints which have to be fulfilled. The most important constraint in that sense is the L/D ratio. One part of this paper is dedicated to the research of the influence of L/D ratio on the energy separation in a vortex tube, i.e. to the values of total temperatures on cold and hot outlets of the device. On the other hand, experimental research of the inner flow is quite challenging since vortex tube is a device of small dimensions. Hence, we are relaying on numerical computations. One of important quantities that has to be prescribed in these computations is the turbulent Prandtl number Pr-T. Because of that, the other part of this paper is dedicated to research of the influence of Pr-T on the results of numerical computations. The research is conducted using open-source software OpenFOAM. Turbulence is modelled using two-equation and RST models. For small L/D ratios there is a secondary circulation that acts as a refrigeration cycle, and for greater L/D ratios distribution of velocity and temperature inside the vortex tube remains the same, regardless of the stagnation point presence. It is not justified to increase the length of the vortex tube beyond 20D since the change in cold total temperature inside the vortex tube as well at the cold outlet is practically null. For L/D variation from 1.8 to 10, the cold outlet temperature changes from 270.9 K to 266.8 K, and then rises to its final value of 270.5 K. For L/D ratio from 20 to 60, the total temperature at cold end remains unchanged at 271.3 K. We obtained good results with the unit value of turbulent Prandtl number, and demonstrated that increasing the Pr-T beyond unit value is not necessary in order to numerically obtain the energy separation inside the vortex tube.",
publisher = "Isfahan Univ Technology, Isfahan",
journal = "Journal of Applied Fluid Mechanics",
title = "Numerical Study of the L/D Ratio and Turbulent Prandtl Number Effect on Energy Separation in a Counter-Flow Vortex Tube",
pages = "1511-1503",
number = "5",
volume = "15",
doi = "10.47176/jafm.15.05.1168"
}

Burazer, J. M., Novković, Đ., Ćoćić, A., Bukurov, M.,& Lečić, M.. (2022). Numerical Study of the L/D Ratio and Turbulent Prandtl Number Effect on Energy Separation in a Counter-Flow Vortex Tube. in Journal of Applied Fluid Mechanics
Isfahan Univ Technology, Isfahan., 15(5), 1503-1511.
https://doi.org/10.47176/jafm.15.05.1168

Burazer JM, Novković Đ, Ćoćić A, Bukurov M, Lečić M. Numerical Study of the L/D Ratio and Turbulent Prandtl Number Effect on Energy Separation in a Counter-Flow Vortex Tube. in Journal of Applied Fluid Mechanics. 2022;15(5):1503-1511.
doi:10.47176/jafm.15.05.1168 .

Burazer, Jela M., Novković, Đorđe , Ćoćić, Aleksandar, Bukurov, M., Lečić, Milan, "Numerical Study of the L/D Ratio and Turbulent Prandtl Number Effect on Energy Separation in a Counter-Flow Vortex Tube" in Journal of Applied Fluid Mechanics, 15, no. 5 (2022):1503-1511,
https://doi.org/10.47176/jafm.15.05.1168 . .

TY  - JOUR
AU  - Burazer, Jela
AU  - Skoko, Dragiša
AU  - Novković, Đorđe 
AU  - Lečić, Milan
AU  - Vorotović, Goran
AU  - Januzović, Miloš
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6241
AB  - Back-pressure air gauging is an effective and practical way of controlling
machine parts in large-scale production. It is a non-contact measuring
technique based on the flapper-nozzle effect. The proper functioning of a
differential pneumatic comparator depends on several geometric para–
meters as well as flow conditions inside the device. The main problems of
this controlling technique are the fouling of the measuring nozzle head and
changes in the accuracy of the comparator. This paper examines the
influence of the supply pressure, the diameter of the orifice in the
measuring branch, and the axial distance in the flapper-nozzle area on
pneumatic comparator performance. In a way, we are trying to optimize
the performance of a given pneumatic comparator with respect to the
tolerance field for which it is intended. The size, strength, and position of
the vacuum in the flapper-nozzle area depend on the supply pressure and
the axial distance between the measuring nozzle outlet cross-section and
the workpiece surface. For a certain combination of these two parameters,
we can influence the vacuum quantities. A pneumatic sensitivity of a
comparator can be increased by increasing the supply pressure. The
greater accuracy of the back pressure air gauge, the smaller the
application range, i.e. the tolerance field that we can control with a given
device.
T2  - FME Transactions
T1  - On some important quantities influencing proper functioning of the differential pneumatic comparator
EP  - 700
IS  - 4
SP  - 693
VL  - 50
DO  - doi: 10.5937/fme2204693B
ER  - 

@article{
author = "Burazer, Jela and Skoko, Dragiša and Novković, Đorđe  and Lečić, Milan and Vorotović, Goran and Januzović, Miloš",
year = "2022",
abstract = "Back-pressure air gauging is an effective and practical way of controlling
machine parts in large-scale production. It is a non-contact measuring
technique based on the flapper-nozzle effect. The proper functioning of a
differential pneumatic comparator depends on several geometric para–
meters as well as flow conditions inside the device. The main problems of
this controlling technique are the fouling of the measuring nozzle head and
changes in the accuracy of the comparator. This paper examines the
influence of the supply pressure, the diameter of the orifice in the
measuring branch, and the axial distance in the flapper-nozzle area on
pneumatic comparator performance. In a way, we are trying to optimize
the performance of a given pneumatic comparator with respect to the
tolerance field for which it is intended. The size, strength, and position of
the vacuum in the flapper-nozzle area depend on the supply pressure and
the axial distance between the measuring nozzle outlet cross-section and
the workpiece surface. For a certain combination of these two parameters,
we can influence the vacuum quantities. A pneumatic sensitivity of a
comparator can be increased by increasing the supply pressure. The
greater accuracy of the back pressure air gauge, the smaller the
application range, i.e. the tolerance field that we can control with a given
device.",
journal = "FME Transactions",
title = "On some important quantities influencing proper functioning of the differential pneumatic comparator",
pages = "700-693",
number = "4",
volume = "50",
doi = "doi: 10.5937/fme2204693B"
}

Burazer, J., Skoko, D., Novković, Đ., Lečić, M., Vorotović, G.,& Januzović, M.. (2022). On some important quantities influencing proper functioning of the differential pneumatic comparator. in FME Transactions, 50(4), 693-700.
https://doi.org/doi: 10.5937/fme2204693B

Burazer J, Skoko D, Novković Đ, Lečić M, Vorotović G, Januzović M. On some important quantities influencing proper functioning of the differential pneumatic comparator. in FME Transactions. 2022;50(4):693-700.
doi:doi: 10.5937/fme2204693B .

Burazer, Jela, Skoko, Dragiša, Novković, Đorđe , Lečić, Milan, Vorotović, Goran, Januzović, Miloš, "On some important quantities influencing proper functioning of the differential pneumatic comparator" in FME Transactions, 50, no. 4 (2022):693-700,
https://doi.org/doi: 10.5937/fme2204693B . .

TY  - JOUR
AU  - Skoko, D. M.
AU  - Crnojević, C. D.
AU  - Lečić, Milan
AU  - Ristivojević, Mileta
AU  - Mitrović, Radivoje
AU  - Burazer, Jela M.
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3733
AB  - The present paper studies the impingement of compressible air jet on a flat plate primarily from the aspect of its application in the domain of pneumatic metrology, i.e. in cases of small distance between the jet nozzle exit and the flat plate. Besides this direct application in the area of pneumatic metrology, the distance between the nozzle exit and the flat plate has been considerably increased and the case of a free jet was analysed with a view to compare the results applicable in various domains. This experimental study demonstrates that the structures of a free jet and this special case of an impingement jet are totally different. In the pressure distribution of the impingement jet, pressure discontinuity above the flat plate may occur, which is shown to be the result of low intensity shock waves and transonic flow. The experimental results show that the pneumatic sensitivity of a pneumatic comparator is a function of the supply pressure and the internal orifice diameter, as well as that the impingement air jet is a typical case of non-isentropic flow.
PB  - Springer, New York
T2  - Experimental Techniques
T1  - Some Characteristics of Compressible Air Impingement Jet Applied in Pneumatic Dimensional Control
EP  - 113
IS  - 1
SP  - 103
VL  - 46
DO  - 10.1007/s40799-021-00460-6
ER  - 

@article{
author = "Skoko, D. M. and Crnojević, C. D. and Lečić, Milan and Ristivojević, Mileta and Mitrović, Radivoje and Burazer, Jela M.",
year = "2022",
abstract = "The present paper studies the impingement of compressible air jet on a flat plate primarily from the aspect of its application in the domain of pneumatic metrology, i.e. in cases of small distance between the jet nozzle exit and the flat plate. Besides this direct application in the area of pneumatic metrology, the distance between the nozzle exit and the flat plate has been considerably increased and the case of a free jet was analysed with a view to compare the results applicable in various domains. This experimental study demonstrates that the structures of a free jet and this special case of an impingement jet are totally different. In the pressure distribution of the impingement jet, pressure discontinuity above the flat plate may occur, which is shown to be the result of low intensity shock waves and transonic flow. The experimental results show that the pneumatic sensitivity of a pneumatic comparator is a function of the supply pressure and the internal orifice diameter, as well as that the impingement air jet is a typical case of non-isentropic flow.",
publisher = "Springer, New York",
journal = "Experimental Techniques",
title = "Some Characteristics of Compressible Air Impingement Jet Applied in Pneumatic Dimensional Control",
pages = "113-103",
number = "1",
volume = "46",
doi = "10.1007/s40799-021-00460-6"
}

Skoko, D. M., Crnojević, C. D., Lečić, M., Ristivojević, M., Mitrović, R.,& Burazer, J. M.. (2022). Some Characteristics of Compressible Air Impingement Jet Applied in Pneumatic Dimensional Control. in Experimental Techniques
Springer, New York., 46(1), 103-113.
https://doi.org/10.1007/s40799-021-00460-6

Skoko DM, Crnojević CD, Lečić M, Ristivojević M, Mitrović R, Burazer JM. Some Characteristics of Compressible Air Impingement Jet Applied in Pneumatic Dimensional Control. in Experimental Techniques. 2022;46(1):103-113.
doi:10.1007/s40799-021-00460-6 .

Skoko, D. M., Crnojević, C. D., Lečić, Milan, Ristivojević, Mileta, Mitrović, Radivoje, Burazer, Jela M., "Some Characteristics of Compressible Air Impingement Jet Applied in Pneumatic Dimensional Control" in Experimental Techniques, 46, no. 1 (2022):103-113,
https://doi.org/10.1007/s40799-021-00460-6 . .

TY  - CONF
AU  - Čantrak, Đorđe
AU  - Janković, Novica
AU  - Lečić, Milan
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6820
PB  - Belgrade : Serbian Society of Mechanics
C3  - The 8th International Congress of Serbian Society of Mechanics, Kragujevac, Serbia, June 28-30 2021., Proceedings, Minisymposium M2: Turbulence
T1  - Forced Vortex in Turbulent Swirling Flow
EP  - 516
SP  - 509
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6820
ER  - 

@conference{
author = "Čantrak, Đorđe and Janković, Novica and Lečić, Milan",
year = "2021",
publisher = "Belgrade : Serbian Society of Mechanics",
journal = "The 8th International Congress of Serbian Society of Mechanics, Kragujevac, Serbia, June 28-30 2021., Proceedings, Minisymposium M2: Turbulence",
title = "Forced Vortex in Turbulent Swirling Flow",
pages = "516-509",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6820"
}

Čantrak, Đ., Janković, N.,& Lečić, M.. (2021). Forced Vortex in Turbulent Swirling Flow. in The 8th International Congress of Serbian Society of Mechanics, Kragujevac, Serbia, June 28-30 2021., Proceedings, Minisymposium M2: Turbulence
Belgrade : Serbian Society of Mechanics., 509-516.
https://hdl.handle.net/21.15107/rcub_machinery_6820

Čantrak Đ, Janković N, Lečić M. Forced Vortex in Turbulent Swirling Flow. in The 8th International Congress of Serbian Society of Mechanics, Kragujevac, Serbia, June 28-30 2021., Proceedings, Minisymposium M2: Turbulence. 2021;:509-516.
https://hdl.handle.net/21.15107/rcub_machinery_6820 .

Čantrak, Đorđe, Janković, Novica, Lečić, Milan, "Forced Vortex in Turbulent Swirling Flow" in The 8th International Congress of Serbian Society of Mechanics, Kragujevac, Serbia, June 28-30 2021., Proceedings, Minisymposium M2: Turbulence (2021):509-516,
https://hdl.handle.net/21.15107/rcub_machinery_6820 .

TY  - CONF
AU  - Raković, Milan
AU  - Ćoćić, Aleksandar
AU  - Lečić, Milan
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6209
AB  - Numerical investigation of the flow structure and computations of drag force around Generic
Conventional Model (GCM) of tractor-trailer is analyzed in this paper. Starting from original GCM,
three additional changes on geometry have been made, and external air flow around all the models has been simulated for four different cruising speeds in open road conditions. OpenFOAM, an open-source CFD software has been used in that purpose, with RANS approach and k-ω SST model. Results shows reductions in the drag from 17-26% in comparison to the drag of the original model. Obtained results on drag reduction and drag coefficients are in agreement with the results from other authors on similar models of tractor-trailer.
C3  - 7th International Congress of Serbian Society of Mechanics
T1  - Numerical study on aerodynamic drag reduction of a tractor-trailer model
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6209
ER  - 

@conference{
author = "Raković, Milan and Ćoćić, Aleksandar and Lečić, Milan",
year = "2019",
abstract = "Numerical investigation of the flow structure and computations of drag force around Generic
Conventional Model (GCM) of tractor-trailer is analyzed in this paper. Starting from original GCM,
three additional changes on geometry have been made, and external air flow around all the models has been simulated for four different cruising speeds in open road conditions. OpenFOAM, an open-source CFD software has been used in that purpose, with RANS approach and k-ω SST model. Results shows reductions in the drag from 17-26% in comparison to the drag of the original model. Obtained results on drag reduction and drag coefficients are in agreement with the results from other authors on similar models of tractor-trailer.",
journal = "7th International Congress of Serbian Society of Mechanics",
title = "Numerical study on aerodynamic drag reduction of a tractor-trailer model",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6209"
}

Raković, M., Ćoćić, A.,& Lečić, M.. (2019). Numerical study on aerodynamic drag reduction of a tractor-trailer model. in 7th International Congress of Serbian Society of Mechanics.
https://hdl.handle.net/21.15107/rcub_machinery_6209

Raković M, Ćoćić A, Lečić M. Numerical study on aerodynamic drag reduction of a tractor-trailer model. in 7th International Congress of Serbian Society of Mechanics. 2019;.
https://hdl.handle.net/21.15107/rcub_machinery_6209 .

Raković, Milan, Ćoćić, Aleksandar, Lečić, Milan, "Numerical study on aerodynamic drag reduction of a tractor-trailer model" in 7th International Congress of Serbian Society of Mechanics (2019),
https://hdl.handle.net/21.15107/rcub_machinery_6209 .

TY  - CONF
AU  - Novković, Đorđe
AU  - Burazer, Jela
AU  - Ćoćić, Aleksandar
AU  - Lečić, Milan
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5586
PB  - Serbian Society of Mechanics, Belgrade
C3  - 7th International Congress of Serbian Society of Mechanics
T1  - Implementation of Hamba k-epsilon Turbulence Model in OpenFOAM Software
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5586
ER  - 

@conference{
author = "Novković, Đorđe and Burazer, Jela and Ćoćić, Aleksandar and Lečić, Milan",
year = "2019",
publisher = "Serbian Society of Mechanics, Belgrade",
journal = "7th International Congress of Serbian Society of Mechanics",
title = "Implementation of Hamba k-epsilon Turbulence Model in OpenFOAM Software",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5586"
}

Novković, Đ., Burazer, J., Ćoćić, A.,& Lečić, M.. (2019). Implementation of Hamba k-epsilon Turbulence Model in OpenFOAM Software. in 7th International Congress of Serbian Society of Mechanics
Serbian Society of Mechanics, Belgrade..
https://hdl.handle.net/21.15107/rcub_machinery_5586

Novković Đ, Burazer J, Ćoćić A, Lečić M. Implementation of Hamba k-epsilon Turbulence Model in OpenFOAM Software. in 7th International Congress of Serbian Society of Mechanics. 2019;.
https://hdl.handle.net/21.15107/rcub_machinery_5586 .

Novković, Đorđe, Burazer, Jela, Ćoćić, Aleksandar, Lečić, Milan, "Implementation of Hamba k-epsilon Turbulence Model in OpenFOAM Software" in 7th International Congress of Serbian Society of Mechanics (2019),
https://hdl.handle.net/21.15107/rcub_machinery_5586 .

TY  - CONF
AU  - Stamenić, Mirjana
AU  - Čantrak, Đorđe
AU  - Janković, Novica
AU  - Lečić, Milan
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3218
AB  - Energy efficiency is one of the key elements of European Union (EU) energy policy. It contributes all key objectives of the EU energy policy, like safety in energy supply, cut down of energy import of EU countries, reduction of the carbon dioxide and other GHG gases, increasing the renewable energy sources share in primary energy consumption. European Commission (EC) presented in December 2003 directives of the European Parliament and Council for the end users. The paper presents a bottom-up methodology for energy efficiency improvements in building sector in Serbia. This methodology is based on the harmonized bottom-up method, reffering to four stages calculation. It is defined in the project "Evaluation and monitoring for the EU directive on energy end-use efficiency and energy services" with a set of calculations and case applications. According to the National Energy Efficiency Action Plan (NEEAP) total indicative target for Republic of Serbia for the period between 2010 and 2018 is 9% of the average final energy consumption (0.7524 Mtoe) where the baseline for calculations is 2008.
PB  - Institute of Electrical and Electronics Engineers Inc.
C3  - Proceedings of the 2018 5th International Symposium on Environment-Friendly Energies and Application
T1  - Some Remarks on Bottom-Up Methodology for Energy Efficiency Action Plans
DO  - 10.1109/EFEA.2018.8617091
ER  - 

@conference{
author = "Stamenić, Mirjana and Čantrak, Đorđe and Janković, Novica and Lečić, Milan",
year = "2019",
abstract = "Energy efficiency is one of the key elements of European Union (EU) energy policy. It contributes all key objectives of the EU energy policy, like safety in energy supply, cut down of energy import of EU countries, reduction of the carbon dioxide and other GHG gases, increasing the renewable energy sources share in primary energy consumption. European Commission (EC) presented in December 2003 directives of the European Parliament and Council for the end users. The paper presents a bottom-up methodology for energy efficiency improvements in building sector in Serbia. This methodology is based on the harmonized bottom-up method, reffering to four stages calculation. It is defined in the project "Evaluation and monitoring for the EU directive on energy end-use efficiency and energy services" with a set of calculations and case applications. According to the National Energy Efficiency Action Plan (NEEAP) total indicative target for Republic of Serbia for the period between 2010 and 2018 is 9% of the average final energy consumption (0.7524 Mtoe) where the baseline for calculations is 2008.",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
journal = "Proceedings of the 2018 5th International Symposium on Environment-Friendly Energies and Application",
title = "Some Remarks on Bottom-Up Methodology for Energy Efficiency Action Plans",
doi = "10.1109/EFEA.2018.8617091"
}

Stamenić, M., Čantrak, Đ., Janković, N.,& Lečić, M.. (2019). Some Remarks on Bottom-Up Methodology for Energy Efficiency Action Plans. in Proceedings of the 2018 5th International Symposium on Environment-Friendly Energies and Application
Institute of Electrical and Electronics Engineers Inc...
https://doi.org/10.1109/EFEA.2018.8617091

Stamenić M, Čantrak Đ, Janković N, Lečić M. Some Remarks on Bottom-Up Methodology for Energy Efficiency Action Plans. in Proceedings of the 2018 5th International Symposium on Environment-Friendly Energies and Application. 2019;.
doi:10.1109/EFEA.2018.8617091 .

Stamenić, Mirjana, Čantrak, Đorđe, Janković, Novica, Lečić, Milan, "Some Remarks on Bottom-Up Methodology for Energy Efficiency Action Plans" in Proceedings of the 2018 5th International Symposium on Environment-Friendly Energies and Application (2019),
https://doi.org/10.1109/EFEA.2018.8617091 . .

TY  - JOUR
AU  - Burazer, Jela M.
AU  - Novković, Đorđe 
AU  - Knežević, Darko M.
AU  - Lečić, Milan
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3040
AB  - Cilj ovog rada je numerička analiza fenomena raslojavanja polja totalne temperature u turbulentnom stišljivom vihornom strujanju u cilindričnoj cevi. U tom smislu, raslojavanje polja totalne temperature u vrtložnoj cevi sa potpuno zatvorenim otvorom za izlaz ohlađenog gasa se analizira numeričkim putem primenom softverom otvorenog tipa - OpenFOAM. Validacija dobijenih numeričkih rezultata je vršena poređenjem sa vrednostima dobijenim eksperimentalnim putem. Za numeričke proračune koriste se dvojednačinski model (standardni k-ε) i puni naponski model turbulencije (LRR). Proračunski domen se smatra dvodimenzionalnim, a radni fluid - vazduh tretira se kao kalorički idealni gas. Uticaj broja ćelija u mreži je izvršen pomoću četiri različite veličine mreže. Raspodele jačine vihora, srednjeg vihora i ugaone brzine jasno ukazuju na uticaj prisustva vihora u strujnom polju. Sa druge strane, združeno sa njihovom vrednošću upućuju i na fiziku ovog izuzetno kompleksnog strujno-termodinamičkog fenomena kakav je fenomen raslojavanja polja totalne temperature. Na osnovu vrednosti i raspodela ovih strujnih veličina, izvršeno je i poređenje između stišljivog i nestišljivog turbulentnog vihornog strujanja.
AB  - The aim of this paper is to numerically analyze the energy separation phenomenon in turbulent compressible swirling flow in a cylindrical tube. In that sense, the energy separation in a vortex tube with orifice at cold end closed completely is examined numerically using OpenFOAM software. Obtained results are validated with the experimental ones. For numerical calculations, both two-equation (standard k-ε) and full Reynolds stress turbulence models (LRR) are used. The computational domain is considered to be two-dimensional, and the working fluid - air is treated as calorically perfect gas. Mesh independence test is carried out for four different mesh sizes. Distributions of swirling flow intensity, average swirl and angular velocity clearly show the influence of the swirl presence in the flow. The values of these quantities point to the physics of this extremely complex flow-thermodynamic phenomenon, such is the energy separation. Based on values and distributions of these flow quantities a comparison between incompressible and compressible turbulent swirling flow is performed.
PB  - Univerzitet u Beogradu - Mašinski fakultet, Beograd
T2  - FME Transactions
T1  - Numeričko istraživanje stišljivog turbulentnog vihornog strujanja sa raslojavanjem polja totalne temperature u cevi
T1  - Numerical research of compressible turbulent swirl flow with energy separation in a cylindrical tube
EP  - 22
IS  - 1
SP  - 16
VL  - 47
DO  - 10.5937/fmet1901016B
ER  - 

@article{
author = "Burazer, Jela M. and Novković, Đorđe  and Knežević, Darko M. and Lečić, Milan",
year = "2019",
abstract = "Cilj ovog rada je numerička analiza fenomena raslojavanja polja totalne temperature u turbulentnom stišljivom vihornom strujanju u cilindričnoj cevi. U tom smislu, raslojavanje polja totalne temperature u vrtložnoj cevi sa potpuno zatvorenim otvorom za izlaz ohlađenog gasa se analizira numeričkim putem primenom softverom otvorenog tipa - OpenFOAM. Validacija dobijenih numeričkih rezultata je vršena poređenjem sa vrednostima dobijenim eksperimentalnim putem. Za numeričke proračune koriste se dvojednačinski model (standardni k-ε) i puni naponski model turbulencije (LRR). Proračunski domen se smatra dvodimenzionalnim, a radni fluid - vazduh tretira se kao kalorički idealni gas. Uticaj broja ćelija u mreži je izvršen pomoću četiri različite veličine mreže. Raspodele jačine vihora, srednjeg vihora i ugaone brzine jasno ukazuju na uticaj prisustva vihora u strujnom polju. Sa druge strane, združeno sa njihovom vrednošću upućuju i na fiziku ovog izuzetno kompleksnog strujno-termodinamičkog fenomena kakav je fenomen raslojavanja polja totalne temperature. Na osnovu vrednosti i raspodela ovih strujnih veličina, izvršeno je i poređenje između stišljivog i nestišljivog turbulentnog vihornog strujanja., The aim of this paper is to numerically analyze the energy separation phenomenon in turbulent compressible swirling flow in a cylindrical tube. In that sense, the energy separation in a vortex tube with orifice at cold end closed completely is examined numerically using OpenFOAM software. Obtained results are validated with the experimental ones. For numerical calculations, both two-equation (standard k-ε) and full Reynolds stress turbulence models (LRR) are used. The computational domain is considered to be two-dimensional, and the working fluid - air is treated as calorically perfect gas. Mesh independence test is carried out for four different mesh sizes. Distributions of swirling flow intensity, average swirl and angular velocity clearly show the influence of the swirl presence in the flow. The values of these quantities point to the physics of this extremely complex flow-thermodynamic phenomenon, such is the energy separation. Based on values and distributions of these flow quantities a comparison between incompressible and compressible turbulent swirling flow is performed.",
publisher = "Univerzitet u Beogradu - Mašinski fakultet, Beograd",
journal = "FME Transactions",
title = "Numeričko istraživanje stišljivog turbulentnog vihornog strujanja sa raslojavanjem polja totalne temperature u cevi, Numerical research of compressible turbulent swirl flow with energy separation in a cylindrical tube",
pages = "22-16",
number = "1",
volume = "47",
doi = "10.5937/fmet1901016B"
}

Burazer, J. M., Novković, Đ., Knežević, D. M.,& Lečić, M.. (2019). Numeričko istraživanje stišljivog turbulentnog vihornog strujanja sa raslojavanjem polja totalne temperature u cevi. in FME Transactions
Univerzitet u Beogradu - Mašinski fakultet, Beograd., 47(1), 16-22.
https://doi.org/10.5937/fmet1901016B

Burazer JM, Novković Đ, Knežević DM, Lečić M. Numeričko istraživanje stišljivog turbulentnog vihornog strujanja sa raslojavanjem polja totalne temperature u cevi. in FME Transactions. 2019;47(1):16-22.
doi:10.5937/fmet1901016B .

Burazer, Jela M., Novković, Đorđe , Knežević, Darko M., Lečić, Milan, "Numeričko istraživanje stišljivog turbulentnog vihornog strujanja sa raslojavanjem polja totalne temperature u cevi" in FME Transactions, 47, no. 1 (2019):16-22,
https://doi.org/10.5937/fmet1901016B . .

TY  - CONF
AU  - Janković, Novica
AU  - Čantrak, Đorđe
AU  - Ilić, Dejan
AU  - Lečić, Milan
PY  - 2018
UR  - https://icas.science/forms/Program_ICAS2018.pdf
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4986
AB  - Swirl flow occurs in various technical systems, nature, biomedical application, and
etc. Turbulent swirl flow in ventilation systems occurs in turbomachines, as well in
ventilation channels behind them, in pipes, diffusers and jets. In this paper is presented
experimental investigation of the turbulent swirl flow behind the axial fan in free jet.
Experiments have been performed in measuring sections downstream the axial fan
impeller by use of the three-component laser Doppler velocimetry (LDV) technique.
Axial fan is installed after the ISO 5801 standard, category A - free inlet and free outlet.
Flow inlet conditions were varied by fan rotation speed and outlet blade angle. Axial
impeller generates Rankine swirl in all cases. Distributions of the time averaged velocity
components revealed all characteristic fluid flow zones. Transformation of these
velocities downstream was also analyzed. It was shown the character of the
circumferential velocity maxima downstream decrement. Evolution of the statistical
moments of the higher order is also presented. It is shown that skewness and flatness
factors differ from normal Gaussian distributions. The highest turbulence levels are
reached in the shear layer zone and in the injection zone. Turbulence swirl flow
anisotropy states are calculated on the basis of the three-component LDV
measurements and presented in the invariant maps. Most of the turbulence states are
positioned in the region, i. e. vicinity of the three-component isotropic turbulence and
axisymmetric expansion states.
PB  - UNIVERSITY OF BANJA LUKA FACULTY OF MECHANICAL ENGINEERING
PB  - UNIVERSITY OF TIMISOARA FACULTY OF ENGINEERING HUNEDOARA
C3  - Sixth International Conference on Applied Sciences ICAS2018, Book of Abstracts, pp. 120
T1  - Insight into the Turbulent Swirl Jet behind the Axial Fan
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4986
ER  - 

@conference{
author = "Janković, Novica and Čantrak, Đorđe and Ilić, Dejan and Lečić, Milan",
year = "2018",
abstract = "Swirl flow occurs in various technical systems, nature, biomedical application, and
etc. Turbulent swirl flow in ventilation systems occurs in turbomachines, as well in
ventilation channels behind them, in pipes, diffusers and jets. In this paper is presented
experimental investigation of the turbulent swirl flow behind the axial fan in free jet.
Experiments have been performed in measuring sections downstream the axial fan
impeller by use of the three-component laser Doppler velocimetry (LDV) technique.
Axial fan is installed after the ISO 5801 standard, category A - free inlet and free outlet.
Flow inlet conditions were varied by fan rotation speed and outlet blade angle. Axial
impeller generates Rankine swirl in all cases. Distributions of the time averaged velocity
components revealed all characteristic fluid flow zones. Transformation of these
velocities downstream was also analyzed. It was shown the character of the
circumferential velocity maxima downstream decrement. Evolution of the statistical
moments of the higher order is also presented. It is shown that skewness and flatness
factors differ from normal Gaussian distributions. The highest turbulence levels are
reached in the shear layer zone and in the injection zone. Turbulence swirl flow
anisotropy states are calculated on the basis of the three-component LDV
measurements and presented in the invariant maps. Most of the turbulence states are
positioned in the region, i. e. vicinity of the three-component isotropic turbulence and
axisymmetric expansion states.",
publisher = "UNIVERSITY OF BANJA LUKA FACULTY OF MECHANICAL ENGINEERING, UNIVERSITY OF TIMISOARA FACULTY OF ENGINEERING HUNEDOARA",
journal = "Sixth International Conference on Applied Sciences ICAS2018, Book of Abstracts, pp. 120",
title = "Insight into the Turbulent Swirl Jet behind the Axial Fan",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4986"
}

Janković, N., Čantrak, Đ., Ilić, D.,& Lečić, M.. (2018). Insight into the Turbulent Swirl Jet behind the Axial Fan. in Sixth International Conference on Applied Sciences ICAS2018, Book of Abstracts, pp. 120
UNIVERSITY OF BANJA LUKA FACULTY OF MECHANICAL ENGINEERING..
https://hdl.handle.net/21.15107/rcub_machinery_4986

Janković N, Čantrak Đ, Ilić D, Lečić M. Insight into the Turbulent Swirl Jet behind the Axial Fan. in Sixth International Conference on Applied Sciences ICAS2018, Book of Abstracts, pp. 120. 2018;.
https://hdl.handle.net/21.15107/rcub_machinery_4986 .

Janković, Novica, Čantrak, Đorđe, Ilić, Dejan, Lečić, Milan, "Insight into the Turbulent Swirl Jet behind the Axial Fan" in Sixth International Conference on Applied Sciences ICAS2018, Book of Abstracts, pp. 120 (2018),
https://hdl.handle.net/21.15107/rcub_machinery_4986 .

TY  - CONF
AU  - Raković, Milan
AU  - Ćoćić, Aleksandar
AU  - Crnojević, Cvetko
AU  - Lečić, Milan
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6215
AB  - Flow past a sphere represents one of the classical problems in fluid dynamics. It is extensively investigated, starting from analytical solution of Navier-Stokes equations in case of creeping flow (Re<<1),  and later on for various ranges of Reynolds number, mostly using experimental methods. In recent decades, with advances in CFD (Computational Fluid Dynamics) this problem is additionaly investigated numerically. In this study, flow past a sphere for broad range of Reynolds number (10 < Re < 200000) is analyzed using open-source software OpenFOAM. Flow is treated as incompressible and for turbulent regime RANS modeling approach is addopted, with comparative analysis for k-e and k-w SST. Unsteady vortex shedding effects  are also analyzed, for both regimes of the flow (laminar and turbulent). Extensive comparisons were made between the predicted and available experimental results for drag coefficient and good agreement is found for almost the whole range of Reynolds number.
C3  - ICAS 2018 Book of abstracts
T1  - Numerical Study of Flow Past Solid Sphere using OpenFOAM
SP  - 164
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6215
ER  - 

@conference{
author = "Raković, Milan and Ćoćić, Aleksandar and Crnojević, Cvetko and Lečić, Milan",
year = "2018",
abstract = "Flow past a sphere represents one of the classical problems in fluid dynamics. It is extensively investigated, starting from analytical solution of Navier-Stokes equations in case of creeping flow (Re<<1),  and later on for various ranges of Reynolds number, mostly using experimental methods. In recent decades, with advances in CFD (Computational Fluid Dynamics) this problem is additionaly investigated numerically. In this study, flow past a sphere for broad range of Reynolds number (10 < Re < 200000) is analyzed using open-source software OpenFOAM. Flow is treated as incompressible and for turbulent regime RANS modeling approach is addopted, with comparative analysis for k-e and k-w SST. Unsteady vortex shedding effects  are also analyzed, for both regimes of the flow (laminar and turbulent). Extensive comparisons were made between the predicted and available experimental results for drag coefficient and good agreement is found for almost the whole range of Reynolds number.",
journal = "ICAS 2018 Book of abstracts",
title = "Numerical Study of Flow Past Solid Sphere using OpenFOAM",
pages = "164",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6215"
}

Raković, M., Ćoćić, A., Crnojević, C.,& Lečić, M.. (2018). Numerical Study of Flow Past Solid Sphere using OpenFOAM. in ICAS 2018 Book of abstracts, 164.
https://hdl.handle.net/21.15107/rcub_machinery_6215

Raković M, Ćoćić A, Crnojević C, Lečić M. Numerical Study of Flow Past Solid Sphere using OpenFOAM. in ICAS 2018 Book of abstracts. 2018;:164.
https://hdl.handle.net/21.15107/rcub_machinery_6215 .

Raković, Milan, Ćoćić, Aleksandar, Crnojević, Cvetko, Lečić, Milan, "Numerical Study of Flow Past Solid Sphere using OpenFOAM" in ICAS 2018 Book of abstracts (2018):164,
https://hdl.handle.net/21.15107/rcub_machinery_6215 .

TY  - JOUR
AU  - Novković, Đorđe 
AU  - Burazer, Jela M.
AU  - Ćoćić, Aleksandar
AU  - Lečić, Milan
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2849
AB  - This paper presents research regarding the influence of turbulent kinetic energy (TKE) level on accuracy of Reynolds averaged Navier-Stokes (RANS) based turbulence models. A theoretical analysis of influence TKE level on accuracy of the RANS turbulence models has been performed according to the Boussinesq hypothesis definition. After that, this theoretical analysis has been investigated by comparison of numerically and experimentally obtained results on the test case of a steady-state incompressible swirl-free flow in a straight conical diffuser named Azad diffuser. Numerical calculations have been performed using the OpenFOAM CFD software and first and second-order closure turbulence models. TKE level, velocity profiles and Reynolds stresses have been calculated downstream in four different cross sections of the diffuser. Certain conclusions about modeling turbulent flows by k - epsilon and LRR turbulence models have been made by comparing the velocity profiles, TKE distribution and Reynolds stresses on the selected cross sections.
PB  - Srpsko društvo za mehaniku, Beograd
T2  - Theoretical and Applied Mechanics
T1  - On the influence of turbulent kinetic energy level on accuracy of k - epsilon and lrr turbulence models
EP  - 149
IS  - 2
SP  - 139
VL  - 45
DO  - 10.2298/TAM171201009N
ER  - 

@article{
author = "Novković, Đorđe  and Burazer, Jela M. and Ćoćić, Aleksandar and Lečić, Milan",
year = "2018",
abstract = "This paper presents research regarding the influence of turbulent kinetic energy (TKE) level on accuracy of Reynolds averaged Navier-Stokes (RANS) based turbulence models. A theoretical analysis of influence TKE level on accuracy of the RANS turbulence models has been performed according to the Boussinesq hypothesis definition. After that, this theoretical analysis has been investigated by comparison of numerically and experimentally obtained results on the test case of a steady-state incompressible swirl-free flow in a straight conical diffuser named Azad diffuser. Numerical calculations have been performed using the OpenFOAM CFD software and first and second-order closure turbulence models. TKE level, velocity profiles and Reynolds stresses have been calculated downstream in four different cross sections of the diffuser. Certain conclusions about modeling turbulent flows by k - epsilon and LRR turbulence models have been made by comparing the velocity profiles, TKE distribution and Reynolds stresses on the selected cross sections.",
publisher = "Srpsko društvo za mehaniku, Beograd",
journal = "Theoretical and Applied Mechanics",
title = "On the influence of turbulent kinetic energy level on accuracy of k - epsilon and lrr turbulence models",
pages = "149-139",
number = "2",
volume = "45",
doi = "10.2298/TAM171201009N"
}

Novković, Đ., Burazer, J. M., Ćoćić, A.,& Lečić, M.. (2018). On the influence of turbulent kinetic energy level on accuracy of k - epsilon and lrr turbulence models. in Theoretical and Applied Mechanics
Srpsko društvo za mehaniku, Beograd., 45(2), 139-149.
https://doi.org/10.2298/TAM171201009N

Novković Đ, Burazer JM, Ćoćić A, Lečić M. On the influence of turbulent kinetic energy level on accuracy of k - epsilon and lrr turbulence models. in Theoretical and Applied Mechanics. 2018;45(2):139-149.
doi:10.2298/TAM171201009N .

Novković, Đorđe , Burazer, Jela M., Ćoćić, Aleksandar, Lečić, Milan, "On the influence of turbulent kinetic energy level on accuracy of k - epsilon and lrr turbulence models" in Theoretical and Applied Mechanics, 45, no. 2 (2018):139-149,
https://doi.org/10.2298/TAM171201009N . .

TY  - CONF
AU  - Novković, Đorđe
AU  - Burazer, Jela
AU  - Ćoćić, Aleksandar
AU  - Lečić, Milan
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5585
C3  - 6th International Congress of Serbian Society of Mechanics
T1  - Numerical Research of Swirl-Free flow in Azad Diffuser
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5585
ER  - 

@conference{
author = "Novković, Đorđe and Burazer, Jela and Ćoćić, Aleksandar and Lečić, Milan",
year = "2017",
journal = "6th International Congress of Serbian Society of Mechanics",
title = "Numerical Research of Swirl-Free flow in Azad Diffuser",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5585"
}

Novković, Đ., Burazer, J., Ćoćić, A.,& Lečić, M.. (2017). Numerical Research of Swirl-Free flow in Azad Diffuser. in 6th International Congress of Serbian Society of Mechanics.
https://hdl.handle.net/21.15107/rcub_machinery_5585

Novković Đ, Burazer J, Ćoćić A, Lečić M. Numerical Research of Swirl-Free flow in Azad Diffuser. in 6th International Congress of Serbian Society of Mechanics. 2017;.
https://hdl.handle.net/21.15107/rcub_machinery_5585 .

Novković, Đorđe, Burazer, Jela, Ćoćić, Aleksandar, Lečić, Milan, "Numerical Research of Swirl-Free flow in Azad Diffuser" in 6th International Congress of Serbian Society of Mechanics (2017),
https://hdl.handle.net/21.15107/rcub_machinery_5585 .

TY  - CONF
AU  - Ćoćić, Aleksandar
AU  - Raković, Milan
AU  - Ilić, Dejan
AU  - Lečić, Milan
PY  - 2017
UR  - http://www.ssm.kg.ac.rs/archive/congress_2017/pdf/Technical_programme_v4.pdf
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4937
AB  - Turbulent, incompressible flow through orifice flow meter is numerically investigated using
OpenFOAM software. Turbulence is modeled using RANS approach, and three turbulence models are tested: standard k-e , k −w and Launder Sharma model. Results for pressure drop on the orifice are compared to experimental results and good agreement is found for all turbulent models, with the most accurate results obtained with k−e model. Velocity and pressure distribution in whole computational domain is analyzed, with special attention to the region in proximity to the orifice where primary and secondary vortex structures are detected. Additionally, numerical computations are also performed on automatically generated mesh using snappyHexMesh utility and similar results for the pressure drop are obtained as the ones on the block-structured grid.
PB  - Srpsko društvo za Mehaniku
C3  - 6th International Congress of Serbian Society of Mechanics
T1  - Numerical computations of turbulent flow through orifice flowmeter
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4937
ER  - 

@conference{
author = "Ćoćić, Aleksandar and Raković, Milan and Ilić, Dejan and Lečić, Milan",
year = "2017",
abstract = "Turbulent, incompressible flow through orifice flow meter is numerically investigated using
OpenFOAM software. Turbulence is modeled using RANS approach, and three turbulence models are tested: standard k-e , k −w and Launder Sharma model. Results for pressure drop on the orifice are compared to experimental results and good agreement is found for all turbulent models, with the most accurate results obtained with k−e model. Velocity and pressure distribution in whole computational domain is analyzed, with special attention to the region in proximity to the orifice where primary and secondary vortex structures are detected. Additionally, numerical computations are also performed on automatically generated mesh using snappyHexMesh utility and similar results for the pressure drop are obtained as the ones on the block-structured grid.",
publisher = "Srpsko društvo za Mehaniku",
journal = "6th International Congress of Serbian Society of Mechanics",
title = "Numerical computations of turbulent flow through orifice flowmeter",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4937"
}

Ćoćić, A., Raković, M., Ilić, D.,& Lečić, M.. (2017). Numerical computations of turbulent flow through orifice flowmeter. in 6th International Congress of Serbian Society of Mechanics
Srpsko društvo za Mehaniku..
https://hdl.handle.net/21.15107/rcub_machinery_4937

Ćoćić A, Raković M, Ilić D, Lečić M. Numerical computations of turbulent flow through orifice flowmeter. in 6th International Congress of Serbian Society of Mechanics. 2017;.
https://hdl.handle.net/21.15107/rcub_machinery_4937 .

Ćoćić, Aleksandar, Raković, Milan, Ilić, Dejan, Lečić, Milan, "Numerical computations of turbulent flow through orifice flowmeter" in 6th International Congress of Serbian Society of Mechanics (2017),
https://hdl.handle.net/21.15107/rcub_machinery_4937 .

TY  - JOUR
AU  - Benišek, Miroslav
AU  - Lečić, Milan
AU  - Čantrak, Đorđe
AU  - Ilić, Dejan
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2548
AB  - This review paper provides data about research activities at the School of the turbulent swirling flow at the Faculty of Mechanical Engineering, University of Belgrade, conducted in the period 1941 up to date. An overview is provided of the main directions in this research area. First papers dealt with the turbulent swirling flow in hydraulic turbines to be continued by the experimental and analytical approaches on the axial fans pressure side. The complexity of 3-D, non-homogeneous, anisotropic turbulent velocity fields required complex experimental and theoretical approach, associated with the complex numerical procedures. Analytical approaches, complex statistical analyses and experimental methods and afterwards CFD employed in the research are presented in this paper. The 150 scientific papers, numerous diploma works, several master of science (magister) theses, six Ph. D. theses and two in progress, 40 researchers, national and international projects are the facts about the School. Scientific references are chronologically presented. Numerous abstracts from scientific conferences, presentations, projects with industry and lectures are not given here.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - THE SCHOOL OF THE TURBULENT SWIRLING FLOW AT THE FACULTY OF MECHANICAL ENGINEERING UNIVERSITY OF BELGRADE
EP  - S911
SP  - S899
VL  - 21, Suppl. 3
DO  - 10.2298/TSCI160628094B
ER  - 

@article{
author = "Benišek, Miroslav and Lečić, Milan and Čantrak, Đorđe and Ilić, Dejan",
year = "2017",
abstract = "This review paper provides data about research activities at the School of the turbulent swirling flow at the Faculty of Mechanical Engineering, University of Belgrade, conducted in the period 1941 up to date. An overview is provided of the main directions in this research area. First papers dealt with the turbulent swirling flow in hydraulic turbines to be continued by the experimental and analytical approaches on the axial fans pressure side. The complexity of 3-D, non-homogeneous, anisotropic turbulent velocity fields required complex experimental and theoretical approach, associated with the complex numerical procedures. Analytical approaches, complex statistical analyses and experimental methods and afterwards CFD employed in the research are presented in this paper. The 150 scientific papers, numerous diploma works, several master of science (magister) theses, six Ph. D. theses and two in progress, 40 researchers, national and international projects are the facts about the School. Scientific references are chronologically presented. Numerous abstracts from scientific conferences, presentations, projects with industry and lectures are not given here.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "THE SCHOOL OF THE TURBULENT SWIRLING FLOW AT THE FACULTY OF MECHANICAL ENGINEERING UNIVERSITY OF BELGRADE",
pages = "S911-S899",
volume = "21, Suppl. 3",
doi = "10.2298/TSCI160628094B"
}

Benišek, M., Lečić, M., Čantrak, Đ.,& Ilić, D.. (2017). THE SCHOOL OF THE TURBULENT SWIRLING FLOW AT THE FACULTY OF MECHANICAL ENGINEERING UNIVERSITY OF BELGRADE. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 21, Suppl. 3, S899-S911.
https://doi.org/10.2298/TSCI160628094B

Benišek M, Lečić M, Čantrak Đ, Ilić D. THE SCHOOL OF THE TURBULENT SWIRLING FLOW AT THE FACULTY OF MECHANICAL ENGINEERING UNIVERSITY OF BELGRADE. in Thermal Science. 2017;21, Suppl. 3:S899-S911.
doi:10.2298/TSCI160628094B .

Benišek, Miroslav, Lečić, Milan, Čantrak, Đorđe, Ilić, Dejan, "THE SCHOOL OF THE TURBULENT SWIRLING FLOW AT THE FACULTY OF MECHANICAL ENGINEERING UNIVERSITY OF BELGRADE" in Thermal Science, 21, Suppl. 3 (2017):S899-S911,
https://doi.org/10.2298/TSCI160628094B . .

TY  - JOUR
AU  - Lečić, Milan
AU  - Ćoćić, Aleksandar
AU  - Burazer, Jela M.
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2653
AB  - This paper presents results of our own velocity field measurements in a straight pipe swirl flow. These studies were conducted using an originally designed hot wire probe. Due to the specially tailored shape of the probe, it was possible to get four measurement points in the viscous sublayer. The time-averaged velocity field and the statistical moments of the second and third order are calculated based on the measured velocity components. Mathematical and physical interpretations of statistical characteristics and structures of turbulent swirl flow in the time domain are presented. On the basis of these results, deeper insight into turbulent transport processes can be obtained, as well as useful conclusions necessary for turbulent swirl flows modeling.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - An experimental investigation and statistical analysis of turbulent swirl flow in a straight pipe
EP  - S704
SP  - S691
VL  - 21
DO  - 10.2298/TSCI160201191L
ER  - 

@article{
author = "Lečić, Milan and Ćoćić, Aleksandar and Burazer, Jela M.",
year = "2017",
abstract = "This paper presents results of our own velocity field measurements in a straight pipe swirl flow. These studies were conducted using an originally designed hot wire probe. Due to the specially tailored shape of the probe, it was possible to get four measurement points in the viscous sublayer. The time-averaged velocity field and the statistical moments of the second and third order are calculated based on the measured velocity components. Mathematical and physical interpretations of statistical characteristics and structures of turbulent swirl flow in the time domain are presented. On the basis of these results, deeper insight into turbulent transport processes can be obtained, as well as useful conclusions necessary for turbulent swirl flows modeling.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "An experimental investigation and statistical analysis of turbulent swirl flow in a straight pipe",
pages = "S704-S691",
volume = "21",
doi = "10.2298/TSCI160201191L"
}

Lečić, M., Ćoćić, A.,& Burazer, J. M.. (2017). An experimental investigation and statistical analysis of turbulent swirl flow in a straight pipe. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 21, S691-S704.
https://doi.org/10.2298/TSCI160201191L

Lečić M, Ćoćić A, Burazer JM. An experimental investigation and statistical analysis of turbulent swirl flow in a straight pipe. in Thermal Science. 2017;21:S691-S704.
doi:10.2298/TSCI160201191L .

Lečić, Milan, Ćoćić, Aleksandar, Burazer, Jela M., "An experimental investigation and statistical analysis of turbulent swirl flow in a straight pipe" in Thermal Science, 21 (2017):S691-S704,
https://doi.org/10.2298/TSCI160201191L . .

TY  - JOUR
AU  - Burazer, Jela M.
AU  - Ćoćić, Aleksandar
AU  - Lečić, Milan
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2605
AB  - The work presented in this paper is dealing with numerical simulation of energy separation mechanism and flow phenomena within a Ranque-Hilsch vortex tube. Simulation of turbulent, compressible, highly swirling flow inside vortex tube is performed using RANS approach, with Favre averaged conservation equations. For turbulence closure, k-epsilon and k-omega shear-stress transport models are used It is assumed that the mean flow is axisymmetric, so the 2-D computational domain is used. Computations were performed using open-source CFD software Open FOAM All compressible solvers available within OpenFOAM were tested, and it was found that most of the solvers cannot predict energy separation. Code of two chosen solvers, which proved as the most robust, is modified in terms of mean energy equation implementation. Newly created solvers predict physically accepted behavior in vortex tube, with good agreement with experimental results. Comparison between performances of solvers is also presented
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Numerical research of the compressible flow in a vortex tube using openfoam software
EP  - S758
SP  - S745
VL  - 21
DO  - 10.2298/TSCI160223195B
ER  - 

@article{
author = "Burazer, Jela M. and Ćoćić, Aleksandar and Lečić, Milan",
year = "2017",
abstract = "The work presented in this paper is dealing with numerical simulation of energy separation mechanism and flow phenomena within a Ranque-Hilsch vortex tube. Simulation of turbulent, compressible, highly swirling flow inside vortex tube is performed using RANS approach, with Favre averaged conservation equations. For turbulence closure, k-epsilon and k-omega shear-stress transport models are used It is assumed that the mean flow is axisymmetric, so the 2-D computational domain is used. Computations were performed using open-source CFD software Open FOAM All compressible solvers available within OpenFOAM were tested, and it was found that most of the solvers cannot predict energy separation. Code of two chosen solvers, which proved as the most robust, is modified in terms of mean energy equation implementation. Newly created solvers predict physically accepted behavior in vortex tube, with good agreement with experimental results. Comparison between performances of solvers is also presented",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Numerical research of the compressible flow in a vortex tube using openfoam software",
pages = "S758-S745",
volume = "21",
doi = "10.2298/TSCI160223195B"
}

Burazer, J. M., Ćoćić, A.,& Lečić, M.. (2017). Numerical research of the compressible flow in a vortex tube using openfoam software. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 21, S745-S758.
https://doi.org/10.2298/TSCI160223195B

Burazer JM, Ćoćić A, Lečić M. Numerical research of the compressible flow in a vortex tube using openfoam software. in Thermal Science. 2017;21:S745-S758.
doi:10.2298/TSCI160223195B .

Burazer, Jela M., Ćoćić, Aleksandar, Lečić, Milan, "Numerical research of the compressible flow in a vortex tube using openfoam software" in Thermal Science, 21 (2017):S745-S758,
https://doi.org/10.2298/TSCI160223195B . .

TY  - JOUR
AU  - Jovanović, B.
AU  - Gadjanski, I.
AU  - Burazer, Jela M.
AU  - Nikolić, L.
AU  - Babić, N.
AU  - Lečić, Milan
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2709
AB  - The authors report results of modification performed on the standard, open-source Cartesian style 3D printer and customized hardware (Printrbot Simple Metal) in order to perform paste extrusion with three different materials (hydroxyapatite, clay and chocolate). These results are shown as examples of research and development performed in an informal institution-a fab lab, in connection with formal research institutions. The authors aimed to show how such collaboration of various players in the research community, coupled with multidisciplinary background of participants, produces new and innovative aspects, which is one of the benefits of fab labs.
PB  - Springer Heidelberg
T2  - Lecture Notes in Mechanical Engineering
T1  - R&D in a fab lab: Examples of paste extrusion method
EP  - 467
SP  - 461
DO  - 10.1007/978-3-319-56430-2_35
ER  - 

@article{
author = "Jovanović, B. and Gadjanski, I. and Burazer, Jela M. and Nikolić, L. and Babić, N. and Lečić, Milan",
year = "2017",
abstract = "The authors report results of modification performed on the standard, open-source Cartesian style 3D printer and customized hardware (Printrbot Simple Metal) in order to perform paste extrusion with three different materials (hydroxyapatite, clay and chocolate). These results are shown as examples of research and development performed in an informal institution-a fab lab, in connection with formal research institutions. The authors aimed to show how such collaboration of various players in the research community, coupled with multidisciplinary background of participants, produces new and innovative aspects, which is one of the benefits of fab labs.",
publisher = "Springer Heidelberg",
journal = "Lecture Notes in Mechanical Engineering",
title = "R&D in a fab lab: Examples of paste extrusion method",
pages = "467-461",
doi = "10.1007/978-3-319-56430-2_35"
}

Jovanović, B., Gadjanski, I., Burazer, J. M., Nikolić, L., Babić, N.,& Lečić, M.. (2017). R&D in a fab lab: Examples of paste extrusion method. in Lecture Notes in Mechanical Engineering
Springer Heidelberg., 461-467.
https://doi.org/10.1007/978-3-319-56430-2_35

Jovanović B, Gadjanski I, Burazer JM, Nikolić L, Babić N, Lečić M. R&D in a fab lab: Examples of paste extrusion method. in Lecture Notes in Mechanical Engineering. 2017;:461-467.
doi:10.1007/978-3-319-56430-2_35 .

Jovanović, B., Gadjanski, I., Burazer, Jela M., Nikolić, L., Babić, N., Lečić, Milan, "R&D in a fab lab: Examples of paste extrusion method" in Lecture Notes in Mechanical Engineering (2017):461-467,
https://doi.org/10.1007/978-3-319-56430-2_35 . .

TY  - JOUR
AU  - Despotović, Željko V.
AU  - Urukalo, Đorđe
AU  - Lečić, Milan
AU  - Cosić, Aleksandar
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2640
AB  - Vibratory conveyors are commonly used in industry for transporting a wide variety of bulk and particulate materials. Various control structures based on state observers can be found in the literature. However, they are mostly based on simplified mathematical models. In order to obtain a more precise state observer, and consequently better performance and (or) control quality, more detailed mathematical model of the resonant vibratory conveyor is required. Mathematical model of a resonant linear vibratory conveyor driven by an electromagnetic excitation force is presented. Derivation of the mathematical model is based on the kinetic and potential energies, dissipative function of the mechanical system, and Lagrangian formulation. A simulation model is implemented on the basis of the derived mathematical equations. The simulation results are presented and compared to the experimental results obtained by a real industrial vibratory conveyor.
PB  - Elsevier Science Inc, New York
T2  - Applied Mathematical Modelling
T1  - Mathematical modeling of resonant linear vibratory conveyor with electromagnetic excitation: simulations and experimental results
EP  - 24
SP  - 1
VL  - 41
DO  - 10.1016/j.apm.2016.09.010
ER  - 

@article{
author = "Despotović, Željko V. and Urukalo, Đorđe and Lečić, Milan and Cosić, Aleksandar",
year = "2017",
abstract = "Vibratory conveyors are commonly used in industry for transporting a wide variety of bulk and particulate materials. Various control structures based on state observers can be found in the literature. However, they are mostly based on simplified mathematical models. In order to obtain a more precise state observer, and consequently better performance and (or) control quality, more detailed mathematical model of the resonant vibratory conveyor is required. Mathematical model of a resonant linear vibratory conveyor driven by an electromagnetic excitation force is presented. Derivation of the mathematical model is based on the kinetic and potential energies, dissipative function of the mechanical system, and Lagrangian formulation. A simulation model is implemented on the basis of the derived mathematical equations. The simulation results are presented and compared to the experimental results obtained by a real industrial vibratory conveyor.",
publisher = "Elsevier Science Inc, New York",
journal = "Applied Mathematical Modelling",
title = "Mathematical modeling of resonant linear vibratory conveyor with electromagnetic excitation: simulations and experimental results",
pages = "24-1",
volume = "41",
doi = "10.1016/j.apm.2016.09.010"
}

Despotović, Ž. V., Urukalo, Đ., Lečić, M.,& Cosić, A.. (2017). Mathematical modeling of resonant linear vibratory conveyor with electromagnetic excitation: simulations and experimental results. in Applied Mathematical Modelling
Elsevier Science Inc, New York., 41, 1-24.
https://doi.org/10.1016/j.apm.2016.09.010

Despotović ŽV, Urukalo Đ, Lečić M, Cosić A. Mathematical modeling of resonant linear vibratory conveyor with electromagnetic excitation: simulations and experimental results. in Applied Mathematical Modelling. 2017;41:1-24.
doi:10.1016/j.apm.2016.09.010 .

Despotović, Željko V., Urukalo, Đorđe, Lečić, Milan, Cosić, Aleksandar, "Mathematical modeling of resonant linear vibratory conveyor with electromagnetic excitation: simulations and experimental results" in Applied Mathematical Modelling, 41 (2017):1-24,
https://doi.org/10.1016/j.apm.2016.09.010 . .

TY  - CONF
AU  - Ćoćić, Aleksandar
AU  - Brajović, Milan
AU  - Lečić, Milan
PY  - 2016
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5483
UR  - https://onlinelibrary.wiley.com/doi/epdf/10.1002/pamm.201610389
AB  - Efficient, and appropriate indoor air environment is important issue in building design. Air flow patterns which are formed in the room are mainly depended on its geometrical parameters. Investigation of flow patterns are performed on a relatively simple geometry of model room, with a small obstacle (partition) in it. There are several interesting flow phenomena which are present in the model room: flow through sudden geometry expansion, stagnation flow with lateral boundaries, flow over the obstacle, etc. Since the air velocities are low, it is assumed that flow is incompressible. Numerical calculations of these patterns have been done using RANS modeling approach. For all calculations an extended version of open-source CFD software OpenFOAM was used. Several turbulence models have been used for RANS approach, with special attention on their performance in capturing unsteady flow phenomena. Comparison of obtained numerical results and available experimental results for mean velocities shown good agreement
C3  - Proceedings in Applied Mathematics and Mechanics (PAMM), Volume16, Issue 1, 2016, pp. 801-802 (Special Issue: Joint 87th Annual Meeting of the International Association of Applied Mathematics and Mechanics (GAMM) and Deutsche Mathematiker-Vereinigung (DMV), Braunschweig 2016
T1  - Numerical Simulation of Air Flow in Model Room
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5483
ER  - 

@conference{
author = "Ćoćić, Aleksandar and Brajović, Milan and Lečić, Milan",
year = "2016",
abstract = "Efficient, and appropriate indoor air environment is important issue in building design. Air flow patterns which are formed in the room are mainly depended on its geometrical parameters. Investigation of flow patterns are performed on a relatively simple geometry of model room, with a small obstacle (partition) in it. There are several interesting flow phenomena which are present in the model room: flow through sudden geometry expansion, stagnation flow with lateral boundaries, flow over the obstacle, etc. Since the air velocities are low, it is assumed that flow is incompressible. Numerical calculations of these patterns have been done using RANS modeling approach. For all calculations an extended version of open-source CFD software OpenFOAM was used. Several turbulence models have been used for RANS approach, with special attention on their performance in capturing unsteady flow phenomena. Comparison of obtained numerical results and available experimental results for mean velocities shown good agreement",
journal = "Proceedings in Applied Mathematics and Mechanics (PAMM), Volume16, Issue 1, 2016, pp. 801-802 (Special Issue: Joint 87th Annual Meeting of the International Association of Applied Mathematics and Mechanics (GAMM) and Deutsche Mathematiker-Vereinigung (DMV), Braunschweig 2016",
title = "Numerical Simulation of Air Flow in Model Room",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5483"
}

Ćoćić, A., Brajović, M.,& Lečić, M.. (2016). Numerical Simulation of Air Flow in Model Room. in Proceedings in Applied Mathematics and Mechanics (PAMM), Volume16, Issue 1, 2016, pp. 801-802 (Special Issue: Joint 87th Annual Meeting of the International Association of Applied Mathematics and Mechanics (GAMM) and Deutsche Mathematiker-Vereinigung (DMV), Braunschweig 2016.
https://hdl.handle.net/21.15107/rcub_machinery_5483

Ćoćić A, Brajović M, Lečić M. Numerical Simulation of Air Flow in Model Room. in Proceedings in Applied Mathematics and Mechanics (PAMM), Volume16, Issue 1, 2016, pp. 801-802 (Special Issue: Joint 87th Annual Meeting of the International Association of Applied Mathematics and Mechanics (GAMM) and Deutsche Mathematiker-Vereinigung (DMV), Braunschweig 2016. 2016;.
https://hdl.handle.net/21.15107/rcub_machinery_5483 .

Ćoćić, Aleksandar, Brajović, Milan, Lečić, Milan, "Numerical Simulation of Air Flow in Model Room" in Proceedings in Applied Mathematics and Mechanics (PAMM), Volume16, Issue 1, 2016, pp. 801-802 (Special Issue: Joint 87th Annual Meeting of the International Association of Applied Mathematics and Mechanics (GAMM) and Deutsche Mathematiker-Vereinigung (DMV), Braunschweig 2016 (2016),
https://hdl.handle.net/21.15107/rcub_machinery_5483 .

TY  - CONF
AU  - Čantrak, Đorđe
AU  - Janković, Novica
AU  - Ilić, Dejan
AU  - Lečić, Milan
PY  - 2016
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2352
AB  - Design of three centrifugal pump impellers is presented in this paper. All impellers are designed in Catia software by Dassault Systems. Impellers have the same outer diameter of 50 mm, but various blade numbers: 5, 6 and 8. In addition, various design techniques are applied. These impellers are followed by the same spiral pump casing. The intention is to study the energy characteristics of the pump impellers, originally designed for various purposes on the same test rig. All three impellers are made on the 3D printing machine - Printrbot Simple. Build volume is 150 mm x 150 mm x 150 mm. Used filament is 1.75 mm PLA/PHA colorFabb 3D printing filament 1.75 mm diameter, standard black, with nozzle 0.4 mm. Print bed is not heated. First tests have shown good impeller durability in operating conditions.
PB  - Institute of Electrical and Electronics Engineers Inc.
C3  - 1st International Conference on Multidisciplinary Engineering Design Optimization, MEDO 2016
T1  - Centrifugal pumps' impellers design and digital fabrication
DO  - 10.1109/MEDO.2016.7746544
ER  - 

@conference{
author = "Čantrak, Đorđe and Janković, Novica and Ilić, Dejan and Lečić, Milan",
year = "2016",
abstract = "Design of three centrifugal pump impellers is presented in this paper. All impellers are designed in Catia software by Dassault Systems. Impellers have the same outer diameter of 50 mm, but various blade numbers: 5, 6 and 8. In addition, various design techniques are applied. These impellers are followed by the same spiral pump casing. The intention is to study the energy characteristics of the pump impellers, originally designed for various purposes on the same test rig. All three impellers are made on the 3D printing machine - Printrbot Simple. Build volume is 150 mm x 150 mm x 150 mm. Used filament is 1.75 mm PLA/PHA colorFabb 3D printing filament 1.75 mm diameter, standard black, with nozzle 0.4 mm. Print bed is not heated. First tests have shown good impeller durability in operating conditions.",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
journal = "1st International Conference on Multidisciplinary Engineering Design Optimization, MEDO 2016",
title = "Centrifugal pumps' impellers design and digital fabrication",
doi = "10.1109/MEDO.2016.7746544"
}

Čantrak, Đ., Janković, N., Ilić, D.,& Lečić, M.. (2016). Centrifugal pumps' impellers design and digital fabrication. in 1st International Conference on Multidisciplinary Engineering Design Optimization, MEDO 2016
Institute of Electrical and Electronics Engineers Inc...
https://doi.org/10.1109/MEDO.2016.7746544

Čantrak Đ, Janković N, Ilić D, Lečić M. Centrifugal pumps' impellers design and digital fabrication. in 1st International Conference on Multidisciplinary Engineering Design Optimization, MEDO 2016. 2016;.
doi:10.1109/MEDO.2016.7746544 .

Čantrak, Đorđe, Janković, Novica, Ilić, Dejan, Lečić, Milan, "Centrifugal pumps' impellers design and digital fabrication" in 1st International Conference on Multidisciplinary Engineering Design Optimization, MEDO 2016 (2016),
https://doi.org/10.1109/MEDO.2016.7746544 . .

TY  - JOUR
AU  - Lečić, Milan
AU  - Ćoćić, Aleksandar
AU  - Čantrak, Svetislav
PY  - 2016
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2443
AB  - Measuring spatial correlations of velocity is done by simultaneous measurement of velocity vector in two different measuring points. Usually, the points should be at a very small distance. While performing correlation measurements in turbulent swirling flow in the pipe, it is necessary to have very precise positioning of hot-wire probes, both by angle and distance. In this research, measurements of spatial correlations in such flow field are performed, for two different cases: velocity correlations in two points on different radial distance and in two points on different axial distance, parallel to the pipe axis. For such measurements two original devices for positioning of hot-wire probes are developed. With these devices appropriate angle positioning and radial and axial distance of hot-wire probes are achieved. Cross-correlation diagrams are also given in this article, as an illustration of capabilities of these original devices for hot-wire probes positioning.
PB  - Springer, New York
T2  - Experimental Techniques
T1  - Positioning Devices For Measuring Spatial Velocity Correlations in Turbulent Swirl Flow in the Pipe by Hot-Wire Probes
EP  - 128
IS  - 1
SP  - 121
VL  - 40
DO  - 10.1007/s40799-016-0018-8
ER  - 

@article{
author = "Lečić, Milan and Ćoćić, Aleksandar and Čantrak, Svetislav",
year = "2016",
abstract = "Measuring spatial correlations of velocity is done by simultaneous measurement of velocity vector in two different measuring points. Usually, the points should be at a very small distance. While performing correlation measurements in turbulent swirling flow in the pipe, it is necessary to have very precise positioning of hot-wire probes, both by angle and distance. In this research, measurements of spatial correlations in such flow field are performed, for two different cases: velocity correlations in two points on different radial distance and in two points on different axial distance, parallel to the pipe axis. For such measurements two original devices for positioning of hot-wire probes are developed. With these devices appropriate angle positioning and radial and axial distance of hot-wire probes are achieved. Cross-correlation diagrams are also given in this article, as an illustration of capabilities of these original devices for hot-wire probes positioning.",
publisher = "Springer, New York",
journal = "Experimental Techniques",
title = "Positioning Devices For Measuring Spatial Velocity Correlations in Turbulent Swirl Flow in the Pipe by Hot-Wire Probes",
pages = "128-121",
number = "1",
volume = "40",
doi = "10.1007/s40799-016-0018-8"
}

Lečić, M., Ćoćić, A.,& Čantrak, S.. (2016). Positioning Devices For Measuring Spatial Velocity Correlations in Turbulent Swirl Flow in the Pipe by Hot-Wire Probes. in Experimental Techniques
Springer, New York., 40(1), 121-128.
https://doi.org/10.1007/s40799-016-0018-8

Lečić M, Ćoćić A, Čantrak S. Positioning Devices For Measuring Spatial Velocity Correlations in Turbulent Swirl Flow in the Pipe by Hot-Wire Probes. in Experimental Techniques. 2016;40(1):121-128.
doi:10.1007/s40799-016-0018-8 .

Lečić, Milan, Ćoćić, Aleksandar, Čantrak, Svetislav, "Positioning Devices For Measuring Spatial Velocity Correlations in Turbulent Swirl Flow in the Pipe by Hot-Wire Probes" in Experimental Techniques, 40, no. 1 (2016):121-128,
https://doi.org/10.1007/s40799-016-0018-8 . .

TY  - CONF
AU  - Vuja, Aleksandru
AU  - Lečić, Milan
AU  - Čolić-Damjanović, Vesna Mila
PY  - 2016
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2351
AB  - Paradigm shift in architectural design initiated by new technological developments has replaced conventional processes of architectural model design with dynamic transformative ones. This paper examines some of the recent developments in the architectural design through analysis of selected architectural projects and their models. The focus of the paper is the analysis of some new approaches in architectural design through implementation of digital design and novel digital fabrication technologies.
PB  - Institute of Electrical and Electronics Engineers Inc.
C3  - 1st International Conference on Multidisciplinary Engineering Design Optimization, MEDO 2016
T1  - Conducting Architectural Experiments: Some new approaches in architectural design
DO  - 10.1109/MEDO.2016.7746542
ER  - 

@conference{
author = "Vuja, Aleksandru and Lečić, Milan and Čolić-Damjanović, Vesna Mila",
year = "2016",
abstract = "Paradigm shift in architectural design initiated by new technological developments has replaced conventional processes of architectural model design with dynamic transformative ones. This paper examines some of the recent developments in the architectural design through analysis of selected architectural projects and their models. The focus of the paper is the analysis of some new approaches in architectural design through implementation of digital design and novel digital fabrication technologies.",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
journal = "1st International Conference on Multidisciplinary Engineering Design Optimization, MEDO 2016",
title = "Conducting Architectural Experiments: Some new approaches in architectural design",
doi = "10.1109/MEDO.2016.7746542"
}

Vuja, A., Lečić, M.,& Čolić-Damjanović, V. M.. (2016). Conducting Architectural Experiments: Some new approaches in architectural design. in 1st International Conference on Multidisciplinary Engineering Design Optimization, MEDO 2016
Institute of Electrical and Electronics Engineers Inc...
https://doi.org/10.1109/MEDO.2016.7746542

Vuja A, Lečić M, Čolić-Damjanović VM. Conducting Architectural Experiments: Some new approaches in architectural design. in 1st International Conference on Multidisciplinary Engineering Design Optimization, MEDO 2016. 2016;.
doi:10.1109/MEDO.2016.7746542 .

Vuja, Aleksandru, Lečić, Milan, Čolić-Damjanović, Vesna Mila, "Conducting Architectural Experiments: Some new approaches in architectural design" in 1st International Conference on Multidisciplinary Engineering Design Optimization, MEDO 2016 (2016),
https://doi.org/10.1109/MEDO.2016.7746542 . .

TY  - CONF
AU  - Lečić, Milan
AU  - Čantrak, Đorđe
AU  - Ćoćić, Aleksandar
PY  - 2015
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6837
C3  - Turbulence Workshop International Symposium, University of Belgrade, Faculty of Mechanical Engineering, August 31-September 2, The Book of Abstracts
T1  - School of the Turbulent Swirl Flow at the Faculty of Mechanical Engineering University of Belgrade
SP  - 36
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6837
ER  - 

@conference{
author = "Lečić, Milan and Čantrak, Đorđe and Ćoćić, Aleksandar",
year = "2015",
journal = "Turbulence Workshop International Symposium, University of Belgrade, Faculty of Mechanical Engineering, August 31-September 2, The Book of Abstracts",
title = "School of the Turbulent Swirl Flow at the Faculty of Mechanical Engineering University of Belgrade",
pages = "36",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6837"
}

Lečić, M., Čantrak, Đ.,& Ćoćić, A.. (2015). School of the Turbulent Swirl Flow at the Faculty of Mechanical Engineering University of Belgrade. in Turbulence Workshop International Symposium, University of Belgrade, Faculty of Mechanical Engineering, August 31-September 2, The Book of Abstracts, 36.
https://hdl.handle.net/21.15107/rcub_machinery_6837

Lečić M, Čantrak Đ, Ćoćić A. School of the Turbulent Swirl Flow at the Faculty of Mechanical Engineering University of Belgrade. in Turbulence Workshop International Symposium, University of Belgrade, Faculty of Mechanical Engineering, August 31-September 2, The Book of Abstracts. 2015;:36.
https://hdl.handle.net/21.15107/rcub_machinery_6837 .

Lečić, Milan, Čantrak, Đorđe, Ćoćić, Aleksandar, "School of the Turbulent Swirl Flow at the Faculty of Mechanical Engineering University of Belgrade" in Turbulence Workshop International Symposium, University of Belgrade, Faculty of Mechanical Engineering, August 31-September 2, The Book of Abstracts (2015):36,
https://hdl.handle.net/21.15107/rcub_machinery_6837 .