TY  - THES
AU  - Guranov, Iva
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7734
AB  - У докторату су анализирани проблеми стационарног осносиметричног дозвучног струjања
гаса у микроцевима. Струjање гаса jе изазвано разликом притисака на улазу и излазу из
микроцеви, како кружног, тако и прстенастог попречног пресека.
У првоj групи проблема анализирано jе изотермско стишљиво струjање разређеног га-
са кроз микроцеви кружног променљивог попречног пресека (конвергентне, дивергентне)
и цеви кружног константног попречног пресека. Други проблем се односи на неизотерм-
ско струjање гаса у микроцевима константног попречног пресека. Добиjена су решења за
стишљиво струjање гаса, као и решења за случаj када се стишљивост занемаруjе.У трећем
проблему анализира се изотермско стишљиво струjање гаса кроз микроцеви константног
прстенастог попречног пресека.Четврта група проблема односи сена струjања у прстенас-
тоjгеометриjи,алисеразматраjунеизотермска струjања са анализомутицаjа стишљивости.
Како се разматра струjање у микроцевима, дужина слободног пута молекула ниjе
занемарљиво мала у односу на пречник цеви, па се ефекат разређености гаса мора узе-
ти у обзир. Разматрани су случаjеви струjања мање разређеног гаса, тj. са Кнудсеновим
броjем мањим од 0,1. С обзиром на то, за решавање проблема могуће jе применити макро-
скопски приступ. Решења се добиjаjу на основу система jедначина континуума: jедначина
континуитета, Навиjе-Стоксове jедначине, jедначина енергиjе и jедначина стања идеалног
гаса. Разређеност се узима у обзир применом граничних услова клизања и температур-
ског скока, карактеристичним за струjања разређеног гаса. Како се струjање одвиjа при
релативно малим вредностима Кнудсеновог броjа, могуће jе претпоставити решења поља
притиска, брзине и температуре у облику пертурбационих редова по Кнудсеновом броjу.
Прва апроксимациjа представља решење за услове континуума. Остале апроксимациjе
представљаjу утицаj клизања, температурског скока, инерциjе, конвекциjе, дисипациjе и
рада услед ширења.
Добиjена решења су верификована поређењем са резултатима других аутора. Потвр-
да тачности решења добиjених пертурбационом методом омогућава примену методе и до-
биjање аналитичких решења и за многе друге случаjеве струjања у микроцевима, за коjе
на други начин ниjе могуће доћи до аналитичких резултата.
AB  - The problems of stationary, axisymmetric, subsonic gas flow in microtubes are analysed in the
dissertation. The gas flow is caused by the pressure drop between the inlet and outlet of the
microtube.
The first problem deals with isothermal compressible flow of rarefied gas through microtubes
with variable circular cross-section (convergent, divergent and microtubes with constant
cross-section). The second problem is related to non-isothermal gas flow in constant crosssection
microtubes. Solutions are obtained for compressible gas flow, as well as for the case
when compressibility is neglected. Isothermal compressible gas flow through microtubes with
constant annular cross-section is analysed in the third problem. The fourth group of problems
considers the annular geometry, but non-isothermal flows with an analysis of compressibility
effects.
The length of the free path of the molecules is not negligibly small compared to the diameter
of the microtube; therefore, the effect of gas rarefaction must be taken into account. The cases
of less rarefied gas flow were considered, i.e. with the Knudsen number lower than 0.1. Hence,
a macroscopic approach was applied to solve the problems. Solutions were obtained based on
the system of continuum equations: the continuity equation, the Navier-Stokes equation, the
energy equation and the equation of state of ideal gas. The rarefaction is taken into account
by applying the boundary conditions of velocity slip and temperature jump, characteristic for
rarefied gas flow. As the flow takes place at relatively small values of the Knudsen number,
it is possible to assume the solutions of the pressure, velocity and temperature in the form of
perturbation series developed according to the Knudsen number. The first element of such
a series represents the first approximation, which includes the solution for the continuum
conditions. Other approximations represent the effects of slip, temperature jump, inertia, convection,
dissipation, and work due to expansion.
The obtained solutions were validated by comparison with the results of other authors.
Confirmation of the accuracy of the solutions obtained by the perturbation method enables the
application of the method for many other cases of gas flow in microtubes, for which it is not
possible to obtain an analytical solution in any other way.
T2  - Univerzitet u Beogradu, Mašinski fakultet
T1  - Strujanja razređenog gasa u mikrocevima
T1  - Rarefied gas flow in microtubes
EP  - 150
SP  - 1
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7734
ER  - 

@phdthesis{
author = "Guranov, Iva",
year = "2023",
abstract = "У докторату су анализирани проблеми стационарног осносиметричног дозвучног струjања
гаса у микроцевима. Струjање гаса jе изазвано разликом притисака на улазу и излазу из
микроцеви, како кружног, тако и прстенастог попречног пресека.
У првоj групи проблема анализирано jе изотермско стишљиво струjање разређеног га-
са кроз микроцеви кружног променљивог попречног пресека (конвергентне, дивергентне)
и цеви кружног константног попречног пресека. Други проблем се односи на неизотерм-
ско струjање гаса у микроцевима константног попречног пресека. Добиjена су решења за
стишљиво струjање гаса, као и решења за случаj када се стишљивост занемаруjе.У трећем
проблему анализира се изотермско стишљиво струjање гаса кроз микроцеви константног
прстенастог попречног пресека.Четврта група проблема односи сена струjања у прстенас-
тоjгеометриjи,алисеразматраjунеизотермска струjања са анализомутицаjа стишљивости.
Како се разматра струjање у микроцевима, дужина слободног пута молекула ниjе
занемарљиво мала у односу на пречник цеви, па се ефекат разређености гаса мора узе-
ти у обзир. Разматрани су случаjеви струjања мање разређеног гаса, тj. са Кнудсеновим
броjем мањим од 0,1. С обзиром на то, за решавање проблема могуће jе применити макро-
скопски приступ. Решења се добиjаjу на основу система jедначина континуума: jедначина
континуитета, Навиjе-Стоксове jедначине, jедначина енергиjе и jедначина стања идеалног
гаса. Разређеност се узима у обзир применом граничних услова клизања и температур-
ског скока, карактеристичним за струjања разређеног гаса. Како се струjање одвиjа при
релативно малим вредностима Кнудсеновог броjа, могуће jе претпоставити решења поља
притиска, брзине и температуре у облику пертурбационих редова по Кнудсеновом броjу.
Прва апроксимациjа представља решење за услове континуума. Остале апроксимациjе
представљаjу утицаj клизања, температурског скока, инерциjе, конвекциjе, дисипациjе и
рада услед ширења.
Добиjена решења су верификована поређењем са резултатима других аутора. Потвр-
да тачности решења добиjених пертурбационом методом омогућава примену методе и до-
биjање аналитичких решења и за многе друге случаjеве струjања у микроцевима, за коjе
на други начин ниjе могуће доћи до аналитичких резултата., The problems of stationary, axisymmetric, subsonic gas flow in microtubes are analysed in the
dissertation. The gas flow is caused by the pressure drop between the inlet and outlet of the
microtube.
The first problem deals with isothermal compressible flow of rarefied gas through microtubes
with variable circular cross-section (convergent, divergent and microtubes with constant
cross-section). The second problem is related to non-isothermal gas flow in constant crosssection
microtubes. Solutions are obtained for compressible gas flow, as well as for the case
when compressibility is neglected. Isothermal compressible gas flow through microtubes with
constant annular cross-section is analysed in the third problem. The fourth group of problems
considers the annular geometry, but non-isothermal flows with an analysis of compressibility
effects.
The length of the free path of the molecules is not negligibly small compared to the diameter
of the microtube; therefore, the effect of gas rarefaction must be taken into account. The cases
of less rarefied gas flow were considered, i.e. with the Knudsen number lower than 0.1. Hence,
a macroscopic approach was applied to solve the problems. Solutions were obtained based on
the system of continuum equations: the continuity equation, the Navier-Stokes equation, the
energy equation and the equation of state of ideal gas. The rarefaction is taken into account
by applying the boundary conditions of velocity slip and temperature jump, characteristic for
rarefied gas flow. As the flow takes place at relatively small values of the Knudsen number,
it is possible to assume the solutions of the pressure, velocity and temperature in the form of
perturbation series developed according to the Knudsen number. The first element of such
a series represents the first approximation, which includes the solution for the continuum
conditions. Other approximations represent the effects of slip, temperature jump, inertia, convection,
dissipation, and work due to expansion.
The obtained solutions were validated by comparison with the results of other authors.
Confirmation of the accuracy of the solutions obtained by the perturbation method enables the
application of the method for many other cases of gas flow in microtubes, for which it is not
possible to obtain an analytical solution in any other way.",
journal = "Univerzitet u Beogradu, Mašinski fakultet",
title = "Strujanja razređenog gasa u mikrocevima, Rarefied gas flow in microtubes",
pages = "150-1",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7734"
}

Guranov, I.. (2023). Strujanja razređenog gasa u mikrocevima. in Univerzitet u Beogradu, Mašinski fakultet, 1-150.
https://hdl.handle.net/21.15107/rcub_machinery_7734

Guranov I. Strujanja razređenog gasa u mikrocevima. in Univerzitet u Beogradu, Mašinski fakultet. 2023;:1-150.
https://hdl.handle.net/21.15107/rcub_machinery_7734 .

Guranov, Iva, "Strujanja razređenog gasa u mikrocevima" in Univerzitet u Beogradu, Mašinski fakultet (2023):1-150,
https://hdl.handle.net/21.15107/rcub_machinery_7734 .

TY  - CONF
AU  - Guranov, Iva
AU  - Milićev, Snežana
AU  - Stevanović, Nevena
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3978
PB  - Serbian Society of Mechanics
C3  - Proceedings of the The 8th International Congress of Serbian Society of Mechanics, Kragujevac, June 28-30, 2021
T1  - Influence of second order effects on pressure distribution in microtubes
EP  - 94
SP  - 93
UR  - https://hdl.handle.net/21.15107/rcub_machinery_3978
ER  - 

@conference{
author = "Guranov, Iva and Milićev, Snežana and Stevanović, Nevena",
year = "2021",
publisher = "Serbian Society of Mechanics",
journal = "Proceedings of the The 8th International Congress of Serbian Society of Mechanics, Kragujevac, June 28-30, 2021",
title = "Influence of second order effects on pressure distribution in microtubes",
pages = "94-93",
url = "https://hdl.handle.net/21.15107/rcub_machinery_3978"
}

Guranov, I., Milićev, S.,& Stevanović, N.. (2021). Influence of second order effects on pressure distribution in microtubes. in Proceedings of the The 8th International Congress of Serbian Society of Mechanics, Kragujevac, June 28-30, 2021
Serbian Society of Mechanics., 93-94.
https://hdl.handle.net/21.15107/rcub_machinery_3978

Guranov I, Milićev S, Stevanović N. Influence of second order effects on pressure distribution in microtubes. in Proceedings of the The 8th International Congress of Serbian Society of Mechanics, Kragujevac, June 28-30, 2021. 2021;:93-94.
https://hdl.handle.net/21.15107/rcub_machinery_3978 .

Guranov, Iva, Milićev, Snežana, Stevanović, Nevena, "Influence of second order effects on pressure distribution in microtubes" in Proceedings of the The 8th International Congress of Serbian Society of Mechanics, Kragujevac, June 28-30, 2021 (2021):93-94,
https://hdl.handle.net/21.15107/rcub_machinery_3978 .

TY  - JOUR
AU  - Guranov, Iva
AU  - Milićev, Snežana
AU  - Stevanović, Nevena
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3553
AB  - In this paper, pressure-driven gas flow through a microtube with constant wall temperature is considered. The ratio of the molecular mean free path and the diameter of the microtube cannot be negligible. Therefore, the gas rarefaction is taken into account. A solution is obtained for subsonic as well as slip and continuum gas flow. Velocity, pressure, and temperature fields are analytically attained by macroscopic approach, using continuity, Navier-Stokes, and energy equations, with the first order boundary conditions for velocity and temperature. Characteristic variables are expressed in the form of perturbation series. The first approximation stands for solution to the continuum flow. The second one reveals the effects of gas rarefaction, inertia, and dissipation. Solutions for compressible and incompressible gas flow are presented and compared with the available results from the literature. A good matching has been achieved. This enables using proposed method for solving other microtube gas flows, which are common in various fields of engineering, biomedicine, pharmacy, etc. The main contribution of this paper is the integral treatment of several important effects such as rarefaction, compressibility, temperature field variability, inertia, and viscous dissipation in the presented solutions. Since the solutions are analytical, they are useful and easily applicable.
PB  - Sage Publications Ltd, London
T2  - Advances in Mechanical Engineering
T1  - Non-isothermal rarefied gas flow in microtube with constant wall temperature
IS  - 11
VL  - 13
DO  - 10.1177/16878140211065147
ER  - 

@article{
author = "Guranov, Iva and Milićev, Snežana and Stevanović, Nevena",
year = "2021",
abstract = "In this paper, pressure-driven gas flow through a microtube with constant wall temperature is considered. The ratio of the molecular mean free path and the diameter of the microtube cannot be negligible. Therefore, the gas rarefaction is taken into account. A solution is obtained for subsonic as well as slip and continuum gas flow. Velocity, pressure, and temperature fields are analytically attained by macroscopic approach, using continuity, Navier-Stokes, and energy equations, with the first order boundary conditions for velocity and temperature. Characteristic variables are expressed in the form of perturbation series. The first approximation stands for solution to the continuum flow. The second one reveals the effects of gas rarefaction, inertia, and dissipation. Solutions for compressible and incompressible gas flow are presented and compared with the available results from the literature. A good matching has been achieved. This enables using proposed method for solving other microtube gas flows, which are common in various fields of engineering, biomedicine, pharmacy, etc. The main contribution of this paper is the integral treatment of several important effects such as rarefaction, compressibility, temperature field variability, inertia, and viscous dissipation in the presented solutions. Since the solutions are analytical, they are useful and easily applicable.",
publisher = "Sage Publications Ltd, London",
journal = "Advances in Mechanical Engineering",
title = "Non-isothermal rarefied gas flow in microtube with constant wall temperature",
number = "11",
volume = "13",
doi = "10.1177/16878140211065147"
}

Guranov, I., Milićev, S.,& Stevanović, N.. (2021). Non-isothermal rarefied gas flow in microtube with constant wall temperature. in Advances in Mechanical Engineering
Sage Publications Ltd, London., 13(11).
https://doi.org/10.1177/16878140211065147

Guranov I, Milićev S, Stevanović N. Non-isothermal rarefied gas flow in microtube with constant wall temperature. in Advances in Mechanical Engineering. 2021;13(11).
doi:10.1177/16878140211065147 .

Guranov, Iva, Milićev, Snežana, Stevanović, Nevena, "Non-isothermal rarefied gas flow in microtube with constant wall temperature" in Advances in Mechanical Engineering, 13, no. 11 (2021),
https://doi.org/10.1177/16878140211065147 . .

TY  - CONF
AU  - Guranov, Iva
AU  - Milićev, Snežana
AU  - Stevanović, Nevena
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3973
AB  - A steady compressible isothermal slip gas flow in a microtube is analyzed for low Reynolds 
numbers. The microtube is with varying cross-section, which from the standpoint of geometry 
gives three considered cases: convergent microtube, divergent microtube and microtube with 
constant radius. The gas flow is caused by the pressure difference between the inlet and the outlet 
cross-section. The solution for pressure and mass flow rate is obtained by macroscopic approach 
from Navier-Stokes equations with the second order velocity slip boundary condition. Analysis of 
the order of dimensionless terms in governing equations is possible with the usage of exact 
relation between Reynolds, Mach and Knudsen numbers. The solution procedure for this flow 
model is based on perturbation approach, where significant variables are assumed in the form of 
perturbation series. The first approximation represents the solution for the continuum flow 
conditions, and the second approximation incorporates the effect of gas rarefaction. The obtained 
solution is compared with verified results of numerical experiment found in literature and good 
agreement is achieved. Hence, the reliability of obtained solution and presented method is 
confirmed.
PB  - Serbian Society of Mechanics
C3  - Proceedings of the The 7th International Congress of Serbian Society of Mechanics, Sremski Karlovci, June 24-26, 2019
T1  - Pressure distribution in microtubes with variable cross section
EP  - 8
SP  - 1
UR  - https://hdl.handle.net/21.15107/rcub_machinery_3973
ER  - 

@conference{
author = "Guranov, Iva and Milićev, Snežana and Stevanović, Nevena",
year = "2019",
abstract = "A steady compressible isothermal slip gas flow in a microtube is analyzed for low Reynolds 
numbers. The microtube is with varying cross-section, which from the standpoint of geometry 
gives three considered cases: convergent microtube, divergent microtube and microtube with 
constant radius. The gas flow is caused by the pressure difference between the inlet and the outlet 
cross-section. The solution for pressure and mass flow rate is obtained by macroscopic approach 
from Navier-Stokes equations with the second order velocity slip boundary condition. Analysis of 
the order of dimensionless terms in governing equations is possible with the usage of exact 
relation between Reynolds, Mach and Knudsen numbers. The solution procedure for this flow 
model is based on perturbation approach, where significant variables are assumed in the form of 
perturbation series. The first approximation represents the solution for the continuum flow 
conditions, and the second approximation incorporates the effect of gas rarefaction. The obtained 
solution is compared with verified results of numerical experiment found in literature and good 
agreement is achieved. Hence, the reliability of obtained solution and presented method is 
confirmed.",
publisher = "Serbian Society of Mechanics",
journal = "Proceedings of the The 7th International Congress of Serbian Society of Mechanics, Sremski Karlovci, June 24-26, 2019",
title = "Pressure distribution in microtubes with variable cross section",
pages = "8-1",
url = "https://hdl.handle.net/21.15107/rcub_machinery_3973"
}

Guranov, I., Milićev, S.,& Stevanović, N.. (2019). Pressure distribution in microtubes with variable cross section. in Proceedings of the The 7th International Congress of Serbian Society of Mechanics, Sremski Karlovci, June 24-26, 2019
Serbian Society of Mechanics., 1-8.
https://hdl.handle.net/21.15107/rcub_machinery_3973

Guranov I, Milićev S, Stevanović N. Pressure distribution in microtubes with variable cross section. in Proceedings of the The 7th International Congress of Serbian Society of Mechanics, Sremski Karlovci, June 24-26, 2019. 2019;:1-8.
https://hdl.handle.net/21.15107/rcub_machinery_3973 .

Guranov, Iva, Milićev, Snežana, Stevanović, Nevena, "Pressure distribution in microtubes with variable cross section" in Proceedings of the The 7th International Congress of Serbian Society of Mechanics, Sremski Karlovci, June 24-26, 2019 (2019):1-8,
https://hdl.handle.net/21.15107/rcub_machinery_3973 .

TY  - JOUR
AU  - Kostić, Srđan
AU  - Stojković, Milan
AU  - Guranov, Iva
AU  - Vasović, Nebojša
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3956
AB  - Authors provide extensive analysis of groundwater level dynamics, in order to classify the observed data, to determine the role of contributing factors and to derive specific estimation models, based on the recordings made at four piezometric stations in Serbia: Leskovac, Kruševac, Negotin and Bogatić. Results obtained indicate the predominant impact of noise confirmed by surrogate data testing, determinism test and Box–Jenkins approach. It is shown that surface water level has a strong impact on the observed dynamics, while the effect of rainfall is almost statistically insignificant. Authors also propose different estimation models: as a combination of deterministic and stochastic components, as a nonlinear function of contributing factors and in a form of system of stochastic differential equations. At the end, authors illustrate simple application of some of derived models in engineering practice for slope stability analyzes.
PB  - Elsevier
T2  - Chaos, Solitons & Fractals
T1  - Revealing the background of groundwater level dynamics: Contributing factors, complex modeling and engineering applications
EP  - 421
IS  - October
SP  - 408
VL  - 127
DO  - 10.1016/j.chaos.2019.07.007
ER  - 

@article{
author = "Kostić, Srđan and Stojković, Milan and Guranov, Iva and Vasović, Nebojša",
year = "2019",
abstract = "Authors provide extensive analysis of groundwater level dynamics, in order to classify the observed data, to determine the role of contributing factors and to derive specific estimation models, based on the recordings made at four piezometric stations in Serbia: Leskovac, Kruševac, Negotin and Bogatić. Results obtained indicate the predominant impact of noise confirmed by surrogate data testing, determinism test and Box–Jenkins approach. It is shown that surface water level has a strong impact on the observed dynamics, while the effect of rainfall is almost statistically insignificant. Authors also propose different estimation models: as a combination of deterministic and stochastic components, as a nonlinear function of contributing factors and in a form of system of stochastic differential equations. At the end, authors illustrate simple application of some of derived models in engineering practice for slope stability analyzes.",
publisher = "Elsevier",
journal = "Chaos, Solitons & Fractals",
title = "Revealing the background of groundwater level dynamics: Contributing factors, complex modeling and engineering applications",
pages = "421-408",
number = "October",
volume = "127",
doi = "10.1016/j.chaos.2019.07.007"
}

Kostić, S., Stojković, M., Guranov, I.,& Vasović, N.. (2019). Revealing the background of groundwater level dynamics: Contributing factors, complex modeling and engineering applications. in Chaos, Solitons & Fractals
Elsevier., 127(October), 408-421.
https://doi.org/10.1016/j.chaos.2019.07.007

Kostić S, Stojković M, Guranov I, Vasović N. Revealing the background of groundwater level dynamics: Contributing factors, complex modeling and engineering applications. in Chaos, Solitons & Fractals. 2019;127(October):408-421.
doi:10.1016/j.chaos.2019.07.007 .

Kostić, Srđan, Stojković, Milan, Guranov, Iva, Vasović, Nebojša, "Revealing the background of groundwater level dynamics: Contributing factors, complex modeling and engineering applications" in Chaos, Solitons & Fractals, 127, no. October (2019):408-421,
https://doi.org/10.1016/j.chaos.2019.07.007 . .

TY  - CONF
AU  - Guranov, Iva
AU  - Milićev, Snežana
AU  - Stevanović, Nevena
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3975
AB  - In this paper the authors considered compressible isothermal steady subsonic slip 
gas flow through microtube at low Reynolds numbers. The dimensions of the 
components in microelectromechanical systems (MEMS) are very small (the order of 
magnitude is 1 µm), and because of that the effect of gas rarefaction cannot be 
neglected, so it should be taken into account. In the analyzed problem gas flow occurs 
due to the pressure difference at the inlet and outlet section of the circular microtube, 
with the variable cross-section (convergent case, divergent case, case with constant 
radius). 
The solving approach in the paper is macroscopic, so the fluid flow is defined by the 
continuity and Navier-Stokes equations. The rarefaction effect is taken into account by
the velocity slip boundary condition at the walls. The solution process is based on a 
perturbation analysis where the order of the terms in the governing equations and 
boundary conditions is determined by using the exact relation between Mach, Reynolds 
and Knudsen numbers. Therefore, with this problem-solving procedure, two 
approximations for the pressure and velocity fields are obtained. The first 
approximation of the characteristic variables corresponds to the conditions of 
continuum flow, while the second approximation shows the effects of rarefied gas flow.
PB  - UNIVERSITY OF BANJA LUKA FACULTY OF MECHANICAL ENGINEERING
C3  - Book of abstracts - 6th International conference of applied science (ICAS 2018), University of Banja Luka, Faculty of Mechanical Engineering, Banja Luka, May 09-11, 2018
T1  - An isothermal compressible slip gas flow through microtube
EP  - 35
SP  - 35
UR  - https://hdl.handle.net/21.15107/rcub_machinery_3975
ER  - 

@conference{
author = "Guranov, Iva and Milićev, Snežana and Stevanović, Nevena",
year = "2018",
abstract = "In this paper the authors considered compressible isothermal steady subsonic slip 
gas flow through microtube at low Reynolds numbers. The dimensions of the 
components in microelectromechanical systems (MEMS) are very small (the order of 
magnitude is 1 µm), and because of that the effect of gas rarefaction cannot be 
neglected, so it should be taken into account. In the analyzed problem gas flow occurs 
due to the pressure difference at the inlet and outlet section of the circular microtube, 
with the variable cross-section (convergent case, divergent case, case with constant 
radius). 
The solving approach in the paper is macroscopic, so the fluid flow is defined by the 
continuity and Navier-Stokes equations. The rarefaction effect is taken into account by
the velocity slip boundary condition at the walls. The solution process is based on a 
perturbation analysis where the order of the terms in the governing equations and 
boundary conditions is determined by using the exact relation between Mach, Reynolds 
and Knudsen numbers. Therefore, with this problem-solving procedure, two 
approximations for the pressure and velocity fields are obtained. The first 
approximation of the characteristic variables corresponds to the conditions of 
continuum flow, while the second approximation shows the effects of rarefied gas flow.",
publisher = "UNIVERSITY OF BANJA LUKA FACULTY OF MECHANICAL ENGINEERING",
journal = "Book of abstracts - 6th International conference of applied science (ICAS 2018), University of Banja Luka, Faculty of Mechanical Engineering, Banja Luka, May 09-11, 2018",
title = "An isothermal compressible slip gas flow through microtube",
pages = "35-35",
url = "https://hdl.handle.net/21.15107/rcub_machinery_3975"
}

Guranov, I., Milićev, S.,& Stevanović, N.. (2018). An isothermal compressible slip gas flow through microtube. in Book of abstracts - 6th International conference of applied science (ICAS 2018), University of Banja Luka, Faculty of Mechanical Engineering, Banja Luka, May 09-11, 2018
UNIVERSITY OF BANJA LUKA FACULTY OF MECHANICAL ENGINEERING., 35-35.
https://hdl.handle.net/21.15107/rcub_machinery_3975

Guranov I, Milićev S, Stevanović N. An isothermal compressible slip gas flow through microtube. in Book of abstracts - 6th International conference of applied science (ICAS 2018), University of Banja Luka, Faculty of Mechanical Engineering, Banja Luka, May 09-11, 2018. 2018;:35-35.
https://hdl.handle.net/21.15107/rcub_machinery_3975 .

Guranov, Iva, Milićev, Snežana, Stevanović, Nevena, "An isothermal compressible slip gas flow through microtube" in Book of abstracts - 6th International conference of applied science (ICAS 2018), University of Banja Luka, Faculty of Mechanical Engineering, Banja Luka, May 09-11, 2018 (2018):35-35,
https://hdl.handle.net/21.15107/rcub_machinery_3975 .

TY  - GEN
AU  - Kostić, Srđan
AU  - Guranov, Iva
AU  - Vasović, Nebojša
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5396
T2  - Техничко решење категорије М82, прихваћено на VIII седници Матичног одбора за уређење, заштиту и коришћење земљишта, воде и ваздуха, 23.10.2017.г.
T1  - Нов поступак прорачуна стабилности косина у интактним чврстим стенским масама, стенским масама са једним предоминантним механичким дисконтинуитетом и стенским масама са развијеном кором површинског распадања
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5396
ER  - 

@misc{
author = "Kostić, Srđan and Guranov, Iva and Vasović, Nebojša",
year = "2017",
journal = "Техничко решење категорије М82, прихваћено на VIII седници Матичног одбора за уређење, заштиту и коришћење земљишта, воде и ваздуха, 23.10.2017.г.",
title = "Нов поступак прорачуна стабилности косина у интактним чврстим стенским масама, стенским масама са једним предоминантним механичким дисконтинуитетом и стенским масама са развијеном кором површинског распадања",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5396"
}

Kostić, S., Guranov, I.,& Vasović, N.. (2017). Нов поступак прорачуна стабилности косина у интактним чврстим стенским масама, стенским масама са једним предоминантним механичким дисконтинуитетом и стенским масама са развијеном кором површинског распадања. in Техничко решење категорије М82, прихваћено на VIII седници Матичног одбора за уређење, заштиту и коришћење земљишта, воде и ваздуха, 23.10.2017.г..
https://hdl.handle.net/21.15107/rcub_machinery_5396

Kostić S, Guranov I, Vasović N. Нов поступак прорачуна стабилности косина у интактним чврстим стенским масама, стенским масама са једним предоминантним механичким дисконтинуитетом и стенским масама са развијеном кором површинског распадања. in Техничко решење категорије М82, прихваћено на VIII седници Матичног одбора за уређење, заштиту и коришћење земљишта, воде и ваздуха, 23.10.2017.г.. 2017;.
https://hdl.handle.net/21.15107/rcub_machinery_5396 .

Kostić, Srđan, Guranov, Iva, Vasović, Nebojša, "Нов поступак прорачуна стабилности косина у интактним чврстим стенским масама, стенским масама са једним предоминантним механичким дисконтинуитетом и стенским масама са развијеном кором површинског распадања" in Техничко решење категорије М82, прихваћено на VIII седници Матичног одбора за уређење, заштиту и коришћење земљишта, воде и ваздуха, 23.10.2017.г. (2017),
https://hdl.handle.net/21.15107/rcub_machinery_5396 .

TY  - CONF
AU  - Guranov, Iva
AU  - Kostić, Srđan
AU  - Vasović, Nebojša
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3977
AB  - In this paper, authors examine the groundwater level oscillation at groundwater station 
Bogatić near Šabac (Serbia), for the period 2002-2014. Analysis is done by transforming the 
observation data into Fourier series within fundamental period of 5 years, and by deriving a 
model based on the autocorrelation properties of the recorded data. One should note that this 
is the first time that such analyzes are preformed for the groundwater level oscillation 
observed in Serbia. The derived model based on groundwater level periodicity is represented 
by a combination of sine and cosine waves. Analysis shows rather satisfying statistical 
accuracy of the model, with R
2=0.707 and mean absolute error of 0.34m, which fails to 
capture the highest values of the groundwater level for the analyzed period. Second model is 
expressed in a form of a simple correlation between the two successive observations, with a 
time delay τ=1 and 4. Both models are derived for the period 2003-2009, and their prediction 
accuracy is checked for the period 2010-2014. Both of these models provide more accurate 
predictions in comparison to the model based on the groundwater level periodicity.
PB  - Serbian Society of Mechanics
C3  - Proceedings of the The 6th International Congress of Serbian Society of Mechanics, Tara, June 19-21, 2017
T1  - Periodic and autoregressive models of groundwater level dynamics
EP  - 10
SP  - 1
UR  - https://hdl.handle.net/21.15107/rcub_machinery_3977
ER  - 

@conference{
author = "Guranov, Iva and Kostić, Srđan and Vasović, Nebojša",
year = "2017",
abstract = "In this paper, authors examine the groundwater level oscillation at groundwater station 
Bogatić near Šabac (Serbia), for the period 2002-2014. Analysis is done by transforming the 
observation data into Fourier series within fundamental period of 5 years, and by deriving a 
model based on the autocorrelation properties of the recorded data. One should note that this 
is the first time that such analyzes are preformed for the groundwater level oscillation 
observed in Serbia. The derived model based on groundwater level periodicity is represented 
by a combination of sine and cosine waves. Analysis shows rather satisfying statistical 
accuracy of the model, with R
2=0.707 and mean absolute error of 0.34m, which fails to 
capture the highest values of the groundwater level for the analyzed period. Second model is 
expressed in a form of a simple correlation between the two successive observations, with a 
time delay τ=1 and 4. Both models are derived for the period 2003-2009, and their prediction 
accuracy is checked for the period 2010-2014. Both of these models provide more accurate 
predictions in comparison to the model based on the groundwater level periodicity.",
publisher = "Serbian Society of Mechanics",
journal = "Proceedings of the The 6th International Congress of Serbian Society of Mechanics, Tara, June 19-21, 2017",
title = "Periodic and autoregressive models of groundwater level dynamics",
pages = "10-1",
url = "https://hdl.handle.net/21.15107/rcub_machinery_3977"
}

Guranov, I., Kostić, S.,& Vasović, N.. (2017). Periodic and autoregressive models of groundwater level dynamics. in Proceedings of the The 6th International Congress of Serbian Society of Mechanics, Tara, June 19-21, 2017
Serbian Society of Mechanics., 1-10.
https://hdl.handle.net/21.15107/rcub_machinery_3977

Guranov I, Kostić S, Vasović N. Periodic and autoregressive models of groundwater level dynamics. in Proceedings of the The 6th International Congress of Serbian Society of Mechanics, Tara, June 19-21, 2017. 2017;:1-10.
https://hdl.handle.net/21.15107/rcub_machinery_3977 .

Guranov, Iva, Kostić, Srđan, Vasović, Nebojša, "Periodic and autoregressive models of groundwater level dynamics" in Proceedings of the The 6th International Congress of Serbian Society of Mechanics, Tara, June 19-21, 2017 (2017):1-10,
https://hdl.handle.net/21.15107/rcub_machinery_3977 .

TY  - JOUR
AU  - Kostić, Srđan
AU  - Guranov, Iva
AU  - Vasović, Nebojša
AU  - Kuzmanović, Dragoslav
PY  - 2016
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3957
AB  - Authors analyze stress-strain distribution within slope using the shear stress reduction technique based on finite element method, which was previously confirmed to provide approximately the same results as the Janbu's corrected limit equilibrium method. Results obtained indicate that the largest vertical displacements occur at the slope base and crest, while central part of the slope is exposed to the largest horizontal displacements. Normal and shear stress show maximum values in the middle part of the slope. It was also determined that separate stress-strain relations could be derived for the exact upper and lower part of the rupture surface.
PB  - Serbian Society of Mechanics
T2  - Theoretical and Applied Mechanics
T1  - Mechanics of weathered clay-marl rock masses along the rupture surface in homogeneous dry slopes
EP  - 98
IS  - 1
SP  - 85
VL  - 43
DO  - 10.2298/TAM160531005K
ER  - 

@article{
author = "Kostić, Srđan and Guranov, Iva and Vasović, Nebojša and Kuzmanović, Dragoslav",
year = "2016",
abstract = "Authors analyze stress-strain distribution within slope using the shear stress reduction technique based on finite element method, which was previously confirmed to provide approximately the same results as the Janbu's corrected limit equilibrium method. Results obtained indicate that the largest vertical displacements occur at the slope base and crest, while central part of the slope is exposed to the largest horizontal displacements. Normal and shear stress show maximum values in the middle part of the slope. It was also determined that separate stress-strain relations could be derived for the exact upper and lower part of the rupture surface.",
publisher = "Serbian Society of Mechanics",
journal = "Theoretical and Applied Mechanics",
title = "Mechanics of weathered clay-marl rock masses along the rupture surface in homogeneous dry slopes",
pages = "98-85",
number = "1",
volume = "43",
doi = "10.2298/TAM160531005K"
}

Kostić, S., Guranov, I., Vasović, N.,& Kuzmanović, D.. (2016). Mechanics of weathered clay-marl rock masses along the rupture surface in homogeneous dry slopes. in Theoretical and Applied Mechanics
Serbian Society of Mechanics., 43(1), 85-98.
https://doi.org/10.2298/TAM160531005K

Kostić S, Guranov I, Vasović N, Kuzmanović D. Mechanics of weathered clay-marl rock masses along the rupture surface in homogeneous dry slopes. in Theoretical and Applied Mechanics. 2016;43(1):85-98.
doi:10.2298/TAM160531005K .

Kostić, Srđan, Guranov, Iva, Vasović, Nebojša, Kuzmanović, Dragoslav, "Mechanics of weathered clay-marl rock masses along the rupture surface in homogeneous dry slopes" in Theoretical and Applied Mechanics, 43, no. 1 (2016):85-98,
https://doi.org/10.2298/TAM160531005K . .

TY  - CONF
AU  - Kostić, Srđan
AU  - Guranov, Iva
AU  - Vasović, Nebojša
PY  - 2015
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3976
AB  - In present paper we analyze dynamics of groundwater level oscillation recorded at two
piezometric stations in Pancevacki rit: ‘’Cuvarnica’’, and ‘’Borca’’ in period 2007-2013. Primary 
goal of the performed research was to determine the character of the main mechanism behind 
these oscillations, which could further serve as a solid base for creating an appropriate prediction
model. Dynamics of the recorded time series is examined using methods of nonlinear time series 
analysis and delay embedding theorem. After embedding the observed time series into three dimensional phase space with embedding delay τ=4, results of surrogate data testing showed that 
analyzed time series originate from a stationary Gaussian linear process that could be distorted by 
a monotonic, instantaneous, time-independent nonlinear function. This is further confirmed by
low values of determinism coefficient and corresponding vector field composed of vectors of 
different length, indicating high level of stochasticity in the observed data. The obtained results 
provide solid foundation for future research, with the final goal of creating an appropriate 
prediction model.
PB  - Serbian Society of Mechanics
C3  - Proceedings of the The 5th International Congress of Serbian Society of Mechanics, Arandjelovac, June 15-17, 2015
T1  - Nonlinear time series analysis of fluid dynamics: stohastic groundwater level oscillation
EP  - 8
SP  - 1
UR  - https://hdl.handle.net/21.15107/rcub_machinery_3976
ER  - 

@conference{
author = "Kostić, Srđan and Guranov, Iva and Vasović, Nebojša",
year = "2015",
abstract = "In present paper we analyze dynamics of groundwater level oscillation recorded at two
piezometric stations in Pancevacki rit: ‘’Cuvarnica’’, and ‘’Borca’’ in period 2007-2013. Primary 
goal of the performed research was to determine the character of the main mechanism behind 
these oscillations, which could further serve as a solid base for creating an appropriate prediction
model. Dynamics of the recorded time series is examined using methods of nonlinear time series 
analysis and delay embedding theorem. After embedding the observed time series into three dimensional phase space with embedding delay τ=4, results of surrogate data testing showed that 
analyzed time series originate from a stationary Gaussian linear process that could be distorted by 
a monotonic, instantaneous, time-independent nonlinear function. This is further confirmed by
low values of determinism coefficient and corresponding vector field composed of vectors of 
different length, indicating high level of stochasticity in the observed data. The obtained results 
provide solid foundation for future research, with the final goal of creating an appropriate 
prediction model.",
publisher = "Serbian Society of Mechanics",
journal = "Proceedings of the The 5th International Congress of Serbian Society of Mechanics, Arandjelovac, June 15-17, 2015",
title = "Nonlinear time series analysis of fluid dynamics: stohastic groundwater level oscillation",
pages = "8-1",
url = "https://hdl.handle.net/21.15107/rcub_machinery_3976"
}

Kostić, S., Guranov, I.,& Vasović, N.. (2015). Nonlinear time series analysis of fluid dynamics: stohastic groundwater level oscillation. in Proceedings of the The 5th International Congress of Serbian Society of Mechanics, Arandjelovac, June 15-17, 2015
Serbian Society of Mechanics., 1-8.
https://hdl.handle.net/21.15107/rcub_machinery_3976

Kostić S, Guranov I, Vasović N. Nonlinear time series analysis of fluid dynamics: stohastic groundwater level oscillation. in Proceedings of the The 5th International Congress of Serbian Society of Mechanics, Arandjelovac, June 15-17, 2015. 2015;:1-8.
https://hdl.handle.net/21.15107/rcub_machinery_3976 .

Kostić, Srđan, Guranov, Iva, Vasović, Nebojša, "Nonlinear time series analysis of fluid dynamics: stohastic groundwater level oscillation" in Proceedings of the The 5th International Congress of Serbian Society of Mechanics, Arandjelovac, June 15-17, 2015 (2015):1-8,
https://hdl.handle.net/21.15107/rcub_machinery_3976 .

TY  - CONF
AU  - Guranov, Iva
AU  - Ćoćić, Aleksandar
AU  - Lečić, Milan
PY  - 2013
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3974
AB  - Viscoelastic fluids are a special class of non-Newtonian fluids. There are several types of viscoelastic fluid models, and
all of them have a complex rheological response in comparison to Newtonian fluids. This response can be viewed as a
combination of viscous and elastic effects and non-linear phenomena. This complex physics makes a numerical simulation
a rather challenging task, even in simple test-cases. Studies presented in this paper are numerical studies of the viscoelastic
fluid flow in several test cases. These studies have been done in OpenFOAM, an open-source CFD package. Implementation
of viscoelastic models and a solver is only available in a community driven version of software (OpenFOAM-ext). One of
the goals of research in this paper was to test the solver and models on some simple test cases. We considered start-up
and pulsating flows of viscoelastic fluid in a channel and a circular pipe. The important thing is that an analytical solution
can be found in these cases, making in possible to test all aspects of numerical simulation in OpenFOAM. Obtained results
showed an excellent agreement with the analytical solution for both velocity and stress components. These results encouraged
authors’ motivation and a choice to use OpenFOAM for simulation of viscoelastic flows. We hope that our research will make
a contribution to the OpenFOAM community. Our plan for the further research is a simulation of blood flow in arteries with
the viscoelastic solver
PB  - Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
C3  - PAMM-Special Issue: 84th Annual Meeting of the International Association of Applied Mathematics and Mechanics (GAMM), Novi Sad 2013
T1  - Numerical Studies of Viscoelastic Flow Using the Software OpenFOAM
EP  - 592
IS  - 1
SP  - 591
VL  - 13
DO  - 10.1002/pamm.201310276
ER  - 

@conference{
author = "Guranov, Iva and Ćoćić, Aleksandar and Lečić, Milan",
year = "2013",
abstract = "Viscoelastic fluids are a special class of non-Newtonian fluids. There are several types of viscoelastic fluid models, and
all of them have a complex rheological response in comparison to Newtonian fluids. This response can be viewed as a
combination of viscous and elastic effects and non-linear phenomena. This complex physics makes a numerical simulation
a rather challenging task, even in simple test-cases. Studies presented in this paper are numerical studies of the viscoelastic
fluid flow in several test cases. These studies have been done in OpenFOAM, an open-source CFD package. Implementation
of viscoelastic models and a solver is only available in a community driven version of software (OpenFOAM-ext). One of
the goals of research in this paper was to test the solver and models on some simple test cases. We considered start-up
and pulsating flows of viscoelastic fluid in a channel and a circular pipe. The important thing is that an analytical solution
can be found in these cases, making in possible to test all aspects of numerical simulation in OpenFOAM. Obtained results
showed an excellent agreement with the analytical solution for both velocity and stress components. These results encouraged
authors’ motivation and a choice to use OpenFOAM for simulation of viscoelastic flows. We hope that our research will make
a contribution to the OpenFOAM community. Our plan for the further research is a simulation of blood flow in arteries with
the viscoelastic solver",
publisher = "Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim",
journal = "PAMM-Special Issue: 84th Annual Meeting of the International Association of Applied Mathematics and Mechanics (GAMM), Novi Sad 2013",
title = "Numerical Studies of Viscoelastic Flow Using the Software OpenFOAM",
pages = "592-591",
number = "1",
volume = "13",
doi = "10.1002/pamm.201310276"
}

Guranov, I., Ćoćić, A.,& Lečić, M.. (2013). Numerical Studies of Viscoelastic Flow Using the Software OpenFOAM. in PAMM-Special Issue: 84th Annual Meeting of the International Association of Applied Mathematics and Mechanics (GAMM), Novi Sad 2013
Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim., 13(1), 591-592.
https://doi.org/10.1002/pamm.201310276

Guranov I, Ćoćić A, Lečić M. Numerical Studies of Viscoelastic Flow Using the Software OpenFOAM. in PAMM-Special Issue: 84th Annual Meeting of the International Association of Applied Mathematics and Mechanics (GAMM), Novi Sad 2013. 2013;13(1):591-592.
doi:10.1002/pamm.201310276 .

Guranov, Iva, Ćoćić, Aleksandar, Lečić, Milan, "Numerical Studies of Viscoelastic Flow Using the Software OpenFOAM" in PAMM-Special Issue: 84th Annual Meeting of the International Association of Applied Mathematics and Mechanics (GAMM), Novi Sad 2013, 13, no. 1 (2013):591-592,
https://doi.org/10.1002/pamm.201310276 . .

TY  - CONF
AU  - Ćoćić, Aleksandar
AU  - Guranov, Iva
PY  - 2011
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5529
AB  - Numerical solution of incompressible laminar flow in square curved duct with 90 degree bend is performed in order to better understand the flow phenomena present in this type of flow. Simulation of flow was done in OpenFOAM, an open-source CFD software. Essentially, OpenFOAM is large C++ library which can be used to create application for solution of various problems in continuum mechanics. Besides object-oriented approach, the main advantage of OpenFOAM is that it is extendable, i.e. users can add their own applications and utilities. The solution for the flow investigated in this paper is for Reynolds number Re = 790. We used experimental results from literature as a validation tool for our simulation. The results of simulation showed very good agreement with experimental results. They also showed that centrifugal force convects the quickly moving fluid particles towards the outer wall. As a result, the axial velocity has peaks in curved region, and secondary flow with various number of vortices is also present. Development of flow in vertical straight section after the bend is also analyzed, where presence of swirl is detected.
C3  - Proceedings of The 3rd International Congres of Serbian Society of Mechanics, Vlasina Lake, Serbia, July 2011
T1  - Numerical investigation of laminar flow in square curved duct with 90 bend
EP  - 1283
SP  - 1275
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5529
ER  - 

@conference{
author = "Ćoćić, Aleksandar and Guranov, Iva",
year = "2011",
abstract = "Numerical solution of incompressible laminar flow in square curved duct with 90 degree bend is performed in order to better understand the flow phenomena present in this type of flow. Simulation of flow was done in OpenFOAM, an open-source CFD software. Essentially, OpenFOAM is large C++ library which can be used to create application for solution of various problems in continuum mechanics. Besides object-oriented approach, the main advantage of OpenFOAM is that it is extendable, i.e. users can add their own applications and utilities. The solution for the flow investigated in this paper is for Reynolds number Re = 790. We used experimental results from literature as a validation tool for our simulation. The results of simulation showed very good agreement with experimental results. They also showed that centrifugal force convects the quickly moving fluid particles towards the outer wall. As a result, the axial velocity has peaks in curved region, and secondary flow with various number of vortices is also present. Development of flow in vertical straight section after the bend is also analyzed, where presence of swirl is detected.",
journal = "Proceedings of The 3rd International Congres of Serbian Society of Mechanics, Vlasina Lake, Serbia, July 2011",
title = "Numerical investigation of laminar flow in square curved duct with 90 bend",
pages = "1283-1275",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5529"
}

Ćoćić, A.,& Guranov, I.. (2011). Numerical investigation of laminar flow in square curved duct with 90 bend. in Proceedings of The 3rd International Congres of Serbian Society of Mechanics, Vlasina Lake, Serbia, July 2011, 1275-1283.
https://hdl.handle.net/21.15107/rcub_machinery_5529

Ćoćić A, Guranov I. Numerical investigation of laminar flow in square curved duct with 90 bend. in Proceedings of The 3rd International Congres of Serbian Society of Mechanics, Vlasina Lake, Serbia, July 2011. 2011;:1275-1283.
https://hdl.handle.net/21.15107/rcub_machinery_5529 .

Ćoćić, Aleksandar, Guranov, Iva, "Numerical investigation of laminar flow in square curved duct with 90 bend" in Proceedings of The 3rd International Congres of Serbian Society of Mechanics, Vlasina Lake, Serbia, July 2011 (2011):1275-1283,
https://hdl.handle.net/21.15107/rcub_machinery_5529 .

TY  - CONF
AU  - Ćoćić, Aleksandar
AU  - Guranov, Iva
PY  - 2011
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3980
AB  - Computational fluid dynamics (CFD) is nowadays a vital part of engineering practice and research in fluid mechanics. 
Application areas of CFD are vast - from fluid flows in various engineering devices, to flow of air in Earth atmosphere to 
flow of blood in human vessels. These are all very complex phenomena, but with adequate modeling and afterwards 
numerical solving, they can be predicted with appropriate accuracy. There are a lot of softwares specially designed for 
solving problems in fluid dynamics. Most of them are commercial ones, licensed with very expensive price and from the 
viewpoint of user, it is impossible to fully access and modify the numerical codes. The open source CFD is one of the 
solutions to overcome these obstacles. One of the open-source CFD softwares is OpenFOAM. In this paper a brief overview 
of it s usage and capabilities are presented. Essentially, OpenFOAM is large C++ library from which users can use 
precompiled applications and utilities, or they can use the library to create their own applications and utilities. The code for 
creation libraries and utilities is open.
PB  - University of Belgrade, Faculty of Mechanical Engineering
C3  - Proceedings of Third International Symposium Contemporary problems of Fluid Mechanics, Belgrade, Serbia, May 2011
T1  - An Overview of OpenFOAM CFD Software
EP  - 126
SP  - 119
UR  - https://hdl.handle.net/21.15107/rcub_machinery_3980
ER  - 

@conference{
author = "Ćoćić, Aleksandar and Guranov, Iva",
year = "2011",
abstract = "Computational fluid dynamics (CFD) is nowadays a vital part of engineering practice and research in fluid mechanics. 
Application areas of CFD are vast - from fluid flows in various engineering devices, to flow of air in Earth atmosphere to 
flow of blood in human vessels. These are all very complex phenomena, but with adequate modeling and afterwards 
numerical solving, they can be predicted with appropriate accuracy. There are a lot of softwares specially designed for 
solving problems in fluid dynamics. Most of them are commercial ones, licensed with very expensive price and from the 
viewpoint of user, it is impossible to fully access and modify the numerical codes. The open source CFD is one of the 
solutions to overcome these obstacles. One of the open-source CFD softwares is OpenFOAM. In this paper a brief overview 
of it s usage and capabilities are presented. Essentially, OpenFOAM is large C++ library from which users can use 
precompiled applications and utilities, or they can use the library to create their own applications and utilities. The code for 
creation libraries and utilities is open.",
publisher = "University of Belgrade, Faculty of Mechanical Engineering",
journal = "Proceedings of Third International Symposium Contemporary problems of Fluid Mechanics, Belgrade, Serbia, May 2011",
title = "An Overview of OpenFOAM CFD Software",
pages = "126-119",
url = "https://hdl.handle.net/21.15107/rcub_machinery_3980"
}

Ćoćić, A.,& Guranov, I.. (2011). An Overview of OpenFOAM CFD Software. in Proceedings of Third International Symposium Contemporary problems of Fluid Mechanics, Belgrade, Serbia, May 2011
University of Belgrade, Faculty of Mechanical Engineering., 119-126.
https://hdl.handle.net/21.15107/rcub_machinery_3980

Ćoćić A, Guranov I. An Overview of OpenFOAM CFD Software. in Proceedings of Third International Symposium Contemporary problems of Fluid Mechanics, Belgrade, Serbia, May 2011. 2011;:119-126.
https://hdl.handle.net/21.15107/rcub_machinery_3980 .

Ćoćić, Aleksandar, Guranov, Iva, "An Overview of OpenFOAM CFD Software" in Proceedings of Third International Symposium Contemporary problems of Fluid Mechanics, Belgrade, Serbia, May 2011 (2011):119-126,
https://hdl.handle.net/21.15107/rcub_machinery_3980 .

TY  - CONF
AU  - Ćoćić, Aleksandar
AU  - Guranov, Iva
AU  - Lečić, Milan
PY  - 2011
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3979
AB  - Numerical solution of incompressible laminar flow in square curved duct with
90◦ bend is performed in order to better understand the flow phenomena present in this
type of flow. Simulation of flow was done in OpenFOAM, an open-source CFD software.
Essentially, OpenFOAM is large C++ library which can be used to create application for
solution of various problems in continuum mechanics. Besides object-oriented approach,
the main advantage of OpenFOAM is that it is extendable, i.e. users can add their own
applications and utilities. The solution for the flow investigated in this paper is for Reynolds
number Re = 790. We used experimental results from literature as a validation tool for our
simulation. The results of simulation showed very good agreement with experimental results.
They also showed that centrifugal force convects the quickly moving fluid particles towards
the outer wall. As a result, the axial velocity has peaks in curved region, and secondary
flow with various number of vortices is also present. Development of flow in vertical straight
section after the bend is also analyzed, where presence of swirl is detected.
PB  - Serbian Society of Mechanics
C3  - Proceedings of The 3rd International Congress of Serbian Society of Mechanics, Vlasina Lake, Serbia, July 2011
T1  - Numerical investigation of laminar flow in square curved duct with 90 bend
EP  - 1283
SP  - 1275
UR  - https://hdl.handle.net/21.15107/rcub_machinery_3979
ER  - 

@conference{
author = "Ćoćić, Aleksandar and Guranov, Iva and Lečić, Milan",
year = "2011",
abstract = "Numerical solution of incompressible laminar flow in square curved duct with
90◦ bend is performed in order to better understand the flow phenomena present in this
type of flow. Simulation of flow was done in OpenFOAM, an open-source CFD software.
Essentially, OpenFOAM is large C++ library which can be used to create application for
solution of various problems in continuum mechanics. Besides object-oriented approach,
the main advantage of OpenFOAM is that it is extendable, i.e. users can add their own
applications and utilities. The solution for the flow investigated in this paper is for Reynolds
number Re = 790. We used experimental results from literature as a validation tool for our
simulation. The results of simulation showed very good agreement with experimental results.
They also showed that centrifugal force convects the quickly moving fluid particles towards
the outer wall. As a result, the axial velocity has peaks in curved region, and secondary
flow with various number of vortices is also present. Development of flow in vertical straight
section after the bend is also analyzed, where presence of swirl is detected.",
publisher = "Serbian Society of Mechanics",
journal = "Proceedings of The 3rd International Congress of Serbian Society of Mechanics, Vlasina Lake, Serbia, July 2011",
title = "Numerical investigation of laminar flow in square curved duct with 90 bend",
pages = "1283-1275",
url = "https://hdl.handle.net/21.15107/rcub_machinery_3979"
}

Ćoćić, A., Guranov, I.,& Lečić, M.. (2011). Numerical investigation of laminar flow in square curved duct with 90 bend. in Proceedings of The 3rd International Congress of Serbian Society of Mechanics, Vlasina Lake, Serbia, July 2011
Serbian Society of Mechanics., 1275-1283.
https://hdl.handle.net/21.15107/rcub_machinery_3979

Ćoćić A, Guranov I, Lečić M. Numerical investigation of laminar flow in square curved duct with 90 bend. in Proceedings of The 3rd International Congress of Serbian Society of Mechanics, Vlasina Lake, Serbia, July 2011. 2011;:1275-1283.
https://hdl.handle.net/21.15107/rcub_machinery_3979 .

Ćoćić, Aleksandar, Guranov, Iva, Lečić, Milan, "Numerical investigation of laminar flow in square curved duct with 90 bend" in Proceedings of The 3rd International Congress of Serbian Society of Mechanics, Vlasina Lake, Serbia, July 2011 (2011):1275-1283,
https://hdl.handle.net/21.15107/rcub_machinery_3979 .