TY  - CHAP
AU  - Mirkov, Nikola S.
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8523
AB  - This study aims at examining predictive capabilities of a specific global (non-zonal) hybrid RANS/LES turbulent flow simulation strategy in the case of flow over smooth hills. The rationale behind recent popularity of such an approach are constraints on computational resources when one is faced with practical LES for realistic engineering flows. In present approach, which originates from the seminal work of Speziale, simulation is performed on coarser computational meshes then required by LES constraints, where the large part of turbulent kinetic energy is unresolved. A challenge of accurate prediction of wall-bounded flows is approached in hybrid models by blending two approaches (RANS and LES) into a single global model, whereby switching is applied seamlessly based on considerations of turbulent flow and grid scales. The RANS part of the hybrid model is supposed to be active in the vicinity of the wall, and the swift transition to LES model should be performed away from the wall, on a desired distance defined by calibration of switching parameters. In our study we perform transient VLES simulation on a model of smooth hill at laboratory scale, resembling well documented wind tunnel experiment, and study in detail statistical flow properties by comparisons with the experimental results. Special attention is given to hybrid model switching behavior in the said case. The study gives very useful insight into simulation of flows of the industrial and environmental types. © Springer Nature Switzerland AG 2020.
T2  - Lecture Notes in Networks and Systems
T1  - An Application of VLES Turbulent Flow Simulation Methodology to Flow over Smooth Hills
VL  - 90
SP  - 288
EP  - 304
DO  - 10.1007/978-3-030-30853-7_17
ER  - 

@inbook{
author = "Mirkov, Nikola S.",
year = "2020",
abstract = "This study aims at examining predictive capabilities of a specific global (non-zonal) hybrid RANS/LES turbulent flow simulation strategy in the case of flow over smooth hills. The rationale behind recent popularity of such an approach are constraints on computational resources when one is faced with practical LES for realistic engineering flows. In present approach, which originates from the seminal work of Speziale, simulation is performed on coarser computational meshes then required by LES constraints, where the large part of turbulent kinetic energy is unresolved. A challenge of accurate prediction of wall-bounded flows is approached in hybrid models by blending two approaches (RANS and LES) into a single global model, whereby switching is applied seamlessly based on considerations of turbulent flow and grid scales. The RANS part of the hybrid model is supposed to be active in the vicinity of the wall, and the swift transition to LES model should be performed away from the wall, on a desired distance defined by calibration of switching parameters. In our study we perform transient VLES simulation on a model of smooth hill at laboratory scale, resembling well documented wind tunnel experiment, and study in detail statistical flow properties by comparisons with the experimental results. Special attention is given to hybrid model switching behavior in the said case. The study gives very useful insight into simulation of flows of the industrial and environmental types. © Springer Nature Switzerland AG 2020.",
journal = "Lecture Notes in Networks and Systems",
booktitle = "An Application of VLES Turbulent Flow Simulation Methodology to Flow over Smooth Hills",
volume = "90",
pages = "288-304",
doi = "10.1007/978-3-030-30853-7_17"
}

Mirkov, N. S.. (2020). An Application of VLES Turbulent Flow Simulation Methodology to Flow over Smooth Hills. in Lecture Notes in Networks and Systems, 90, 288-304.
https://doi.org/10.1007/978-3-030-30853-7_17

Mirkov NS. An Application of VLES Turbulent Flow Simulation Methodology to Flow over Smooth Hills. in Lecture Notes in Networks and Systems. 2020;90:288-304.
doi:10.1007/978-3-030-30853-7_17 .

Mirkov, Nikola S., "An Application of VLES Turbulent Flow Simulation Methodology to Flow over Smooth Hills" in Lecture Notes in Networks and Systems, 90 (2020):288-304,
https://doi.org/10.1007/978-3-030-30853-7_17 . .

TY  - CONF
AU  - Kastratović, Gordana M.
AU  - Vidanović, Nenad D.
AU  - Grbović, Aleksandar M.
AU  - Mirkov, Nikola S.
AU  - Rašuo, Boško P.
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8525
AB  - This paper discusses certain aspects of numerical simulation of crack propagation in wire ropes subjected to axial loading, with the aim to explore and to demonstrate the capacity, performances and difficulties of crack propagation modeling by usage of numerical computational methods in such complex structures. For this purpose, the finite element method (FEM) was used, and 3D numerical analyses were performed in Ansys Workbench software. In order to validate and verify performed numerical modeling, crack growth rate based on calculated stress intensity factors (SIFs) along the crack fronts was obtained for the model for which experimental results could be found in the available literature. Finally, using the advanced modeling techniques, the parametric 3D model of seven-wire strand was analyzed. Conducted analysis showed that FEM could be a powerful tool for fatigue life predictions in order to reduce the need for experiments, which are still the only successful method for fatigue life estimation of wire ropes. © Springer Nature Switzerland AG 2020.
C3  - Computational and Experimental Approaches in Materials Science and Engineering, CNNTech 2019
T1  - Numerical Simulation of Crack Propagation in Seven-Wire Strand
VL  - 90
SP  - 76
EP  - 91
DO  - 10.1007/978-3-030-30853-7_5
ER  - 

@conference{
author = "Kastratović, Gordana M. and Vidanović, Nenad D. and Grbović, Aleksandar M. and Mirkov, Nikola S. and Rašuo, Boško P.",
year = "2020",
abstract = "This paper discusses certain aspects of numerical simulation of crack propagation in wire ropes subjected to axial loading, with the aim to explore and to demonstrate the capacity, performances and difficulties of crack propagation modeling by usage of numerical computational methods in such complex structures. For this purpose, the finite element method (FEM) was used, and 3D numerical analyses were performed in Ansys Workbench software. In order to validate and verify performed numerical modeling, crack growth rate based on calculated stress intensity factors (SIFs) along the crack fronts was obtained for the model for which experimental results could be found in the available literature. Finally, using the advanced modeling techniques, the parametric 3D model of seven-wire strand was analyzed. Conducted analysis showed that FEM could be a powerful tool for fatigue life predictions in order to reduce the need for experiments, which are still the only successful method for fatigue life estimation of wire ropes. © Springer Nature Switzerland AG 2020.",
journal = "Computational and Experimental Approaches in Materials Science and Engineering, CNNTech 2019",
title = "Numerical Simulation of Crack Propagation in Seven-Wire Strand",
volume = "90",
pages = "76-91",
doi = "10.1007/978-3-030-30853-7_5"
}

Kastratović, G. M., Vidanović, N. D., Grbović, A. M., Mirkov, N. S.,& Rašuo, B. P.. (2020). Numerical Simulation of Crack Propagation in Seven-Wire Strand. in Computational and Experimental Approaches in Materials Science and Engineering, CNNTech 2019, 90, 76-91.
https://doi.org/10.1007/978-3-030-30853-7_5

Kastratović GM, Vidanović ND, Grbović AM, Mirkov NS, Rašuo BP. Numerical Simulation of Crack Propagation in Seven-Wire Strand. in Computational and Experimental Approaches in Materials Science and Engineering, CNNTech 2019. 2020;90:76-91.
doi:10.1007/978-3-030-30853-7_5 .

Kastratović, Gordana M., Vidanović, Nenad D., Grbović, Aleksandar M., Mirkov, Nikola S., Rašuo, Boško P., "Numerical Simulation of Crack Propagation in Seven-Wire Strand" in Computational and Experimental Approaches in Materials Science and Engineering, CNNTech 2019, 90 (2020):76-91,
https://doi.org/10.1007/978-3-030-30853-7_5 . .

TY  - JOUR
AU  - Živković, Predrag
AU  - Tomić, Mladen
AU  - Bakić, Vukman
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9183
AB  - Wind power assessment in complex terrain is a very demanding task. Modeling wind conditions with standard linear models does not sufficiently reproduce wind conditions in complex terrains, especially on leeward sides of terrain slopes, primarily due to the vorticity. A more complex non-linear model, based on Reynolds averaged Navier-Stokes equations has been used. Turbulence was modeled by modified two-equations k-? model for neutral atmospheric boundary-layer conditions, written in general curvelinear non-orthogonal co-ordinate system. The full set of mass and momentum conservation equations as well as turbulence model equations are numerically solved, using the as CFD technique. A comparison of the application of linear model and non-linear model is presented. Considerable discrepancies of estimated wind speed have been obtained using linear and non-linear models. Statistics of annual electricity production vary up to 30% of the model site. Even anemometer measurements directly at a wind turbine?s site do not necessarily deliver the results needed for prediction calculations, as extrapolations of wind speed to hub height is tricky. The results of the simulation are compared by means of the turbine type, quality and quantity of the wind data and capacity factor. Finally, the comparison of the estimated results with the measured data at 10, 30, and 50 m is shown.
T2  - Thermal Science
T1  - Experimental validation of wind energy estimation
VL  - 24
IS  - 6 Part A
SP  - 3795
EP  - 3806
DO  - 10.2298/TSCI191207474Z
ER  - 

@article{
author = "Živković, Predrag and Tomić, Mladen and Bakić, Vukman",
year = "2020",
abstract = "Wind power assessment in complex terrain is a very demanding task. Modeling wind conditions with standard linear models does not sufficiently reproduce wind conditions in complex terrains, especially on leeward sides of terrain slopes, primarily due to the vorticity. A more complex non-linear model, based on Reynolds averaged Navier-Stokes equations has been used. Turbulence was modeled by modified two-equations k-? model for neutral atmospheric boundary-layer conditions, written in general curvelinear non-orthogonal co-ordinate system. The full set of mass and momentum conservation equations as well as turbulence model equations are numerically solved, using the as CFD technique. A comparison of the application of linear model and non-linear model is presented. Considerable discrepancies of estimated wind speed have been obtained using linear and non-linear models. Statistics of annual electricity production vary up to 30% of the model site. Even anemometer measurements directly at a wind turbine?s site do not necessarily deliver the results needed for prediction calculations, as extrapolations of wind speed to hub height is tricky. The results of the simulation are compared by means of the turbine type, quality and quantity of the wind data and capacity factor. Finally, the comparison of the estimated results with the measured data at 10, 30, and 50 m is shown.",
journal = "Thermal Science",
title = "Experimental validation of wind energy estimation",
volume = "24",
number = "6 Part A",
pages = "3795-3806",
doi = "10.2298/TSCI191207474Z"
}

Živković, P., Tomić, M.,& Bakić, V.. (2020). Experimental validation of wind energy estimation. in Thermal Science, 24(6 Part A), 3795-3806.
https://doi.org/10.2298/TSCI191207474Z

Živković P, Tomić M, Bakić V. Experimental validation of wind energy estimation. in Thermal Science. 2020;24(6 Part A):3795-3806.
doi:10.2298/TSCI191207474Z .

Živković, Predrag, Tomić, Mladen, Bakić, Vukman, "Experimental validation of wind energy estimation" in Thermal Science, 24, no. 6 Part A (2020):3795-3806,
https://doi.org/10.2298/TSCI191207474Z . .

TY  - CHAP
AU  - Mirkov, Nikola S.
AU  - Vidanović, Nenad D.
AU  - Kastratović, Gordana M.
PY  - 2019
UR  - http://link.springer.com/10.1007/978-3-319-99620-2_11
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8107
AB  - The paper describes development of an open-source library (www.github.com/nikola-m/freeCappuccino) for computational fluid dynamics and in general computational continuum mechanics. The code is based on finite volume method on arbitrary unstructured polyhedral meshes. The interfaces to highly abstract data types such as arbitrary order tensor fields on discretized finite volume domains, and scalar and vector sparse linear systems resulting from finite volume discretization of partial differential equations are provided. Explicit manipulation of tensor fields through high level, highly abstract programming syntax is explained. Also, implicit operation over tensor fields pertinent to discretization of partial differential operators is provided and explained. The library is developed in modern version of Fortran. Code parallelization is achieved through domain decomposition and implemented using MPI and OpenMP. While avoiding the usual class syntax of object-oriented programming, the code has essentially object oriented design. Comparison is made with the well-known OpenFOAM library. The purpose of the ongoing development is providing researchers with a tool for easy transfer of mathematical operations of their physical models into functional and efficient simulation software based on finite volume method. The guiding principle of development is exchange of ideas and reproducibility in computational science in general.
T2  - Lecture Notes in Networks and Systems
T1  - freeCappuccino - An Open Source Software Library for Computational Continuum Mechanics
VL  - 54
SP  - 137
EP  - 147
DO  - 10.1007/978-3-319-99620-2_11
ER  - 

@inbook{
author = "Mirkov, Nikola S. and Vidanović, Nenad D. and Kastratović, Gordana M.",
year = "2019",
abstract = "The paper describes development of an open-source library (www.github.com/nikola-m/freeCappuccino) for computational fluid dynamics and in general computational continuum mechanics. The code is based on finite volume method on arbitrary unstructured polyhedral meshes. The interfaces to highly abstract data types such as arbitrary order tensor fields on discretized finite volume domains, and scalar and vector sparse linear systems resulting from finite volume discretization of partial differential equations are provided. Explicit manipulation of tensor fields through high level, highly abstract programming syntax is explained. Also, implicit operation over tensor fields pertinent to discretization of partial differential operators is provided and explained. The library is developed in modern version of Fortran. Code parallelization is achieved through domain decomposition and implemented using MPI and OpenMP. While avoiding the usual class syntax of object-oriented programming, the code has essentially object oriented design. Comparison is made with the well-known OpenFOAM library. The purpose of the ongoing development is providing researchers with a tool for easy transfer of mathematical operations of their physical models into functional and efficient simulation software based on finite volume method. The guiding principle of development is exchange of ideas and reproducibility in computational science in general.",
journal = "Lecture Notes in Networks and Systems",
booktitle = "freeCappuccino - An Open Source Software Library for Computational Continuum Mechanics",
volume = "54",
pages = "137-147",
doi = "10.1007/978-3-319-99620-2_11"
}

Mirkov, N. S., Vidanović, N. D.,& Kastratović, G. M.. (2019). freeCappuccino - An Open Source Software Library for Computational Continuum Mechanics. in Lecture Notes in Networks and Systems, 54, 137-147.
https://doi.org/10.1007/978-3-319-99620-2_11

Mirkov NS, Vidanović ND, Kastratović GM. freeCappuccino - An Open Source Software Library for Computational Continuum Mechanics. in Lecture Notes in Networks and Systems. 2019;54:137-147.
doi:10.1007/978-3-319-99620-2_11 .

Mirkov, Nikola S., Vidanović, Nenad D., Kastratović, Gordana M., "freeCappuccino - An Open Source Software Library for Computational Continuum Mechanics" in Lecture Notes in Networks and Systems, 54 (2019):137-147,
https://doi.org/10.1007/978-3-319-99620-2_11 . .

TY  - JOUR
AU  - Jovanović, Marina P.
AU  - Bakić, Vukman
AU  - Vučićević, Biljana S.
AU  - Turanjanin, Valentina
PY  - 2018
UR  - http://www.doiserbia.nb.rs/Article.aspx?ID=0354-98361800298J
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7980
AB  - The district heating system in Serbia, with an installed capacity of 6,600 MW, currently supplies 58 towns with thermal energy. As a candidate country for accession to the European Union, Serbia faces the obligation to reduce the level of its greenhouse gas emissions as part of environmental reforms. This paper presents a basic scenario and three alternatives for final energy consumption in the district heating sector for the years 2015, 2020 and 2025. It is suggested that demand for heating will increase 10% up to 2020 and by 15% up to2025, in relation to 2015 levels, while the share of each energy carrier will not change. Changing the structure of energy sources for heat supply assumes a decrease in the share of coal and liquid fuel, and increases in the use of biomass and natural gas. The results obtained were compared to the General Index of Sustainability which is a measure of the complexity of the proposed energy scenario. The paper considers the formation of related energy indicators as quantitative tools for the analysis of changes. It also proposes a methodology for multi-criteria analysis in the sustainability assessment of complex energy systems based on the stochastic evaluation of criteria (sets of indicators and sub-indicators). In this way, the results of the multi-criteria assessment can help in the decision-making process in cases where economic, social and ecological criteria are considered to be influential. © 2018 Serbian Society of Heat Transfer Engineers.
T2  - Thermal Science
T1  - Analysis of different scenarios and sustainability measurement in the district heating sector in Serbia
VL  - 22
IS  - 00 (Online first)
SP  - 298
EP  - 298
DO  - 10.2298/TSCI181009298J
ER  - 

@article{
author = "Jovanović, Marina P. and Bakić, Vukman and Vučićević, Biljana S. and Turanjanin, Valentina",
year = "2018",
abstract = "The district heating system in Serbia, with an installed capacity of 6,600 MW, currently supplies 58 towns with thermal energy. As a candidate country for accession to the European Union, Serbia faces the obligation to reduce the level of its greenhouse gas emissions as part of environmental reforms. This paper presents a basic scenario and three alternatives for final energy consumption in the district heating sector for the years 2015, 2020 and 2025. It is suggested that demand for heating will increase 10% up to 2020 and by 15% up to2025, in relation to 2015 levels, while the share of each energy carrier will not change. Changing the structure of energy sources for heat supply assumes a decrease in the share of coal and liquid fuel, and increases in the use of biomass and natural gas. The results obtained were compared to the General Index of Sustainability which is a measure of the complexity of the proposed energy scenario. The paper considers the formation of related energy indicators as quantitative tools for the analysis of changes. It also proposes a methodology for multi-criteria analysis in the sustainability assessment of complex energy systems based on the stochastic evaluation of criteria (sets of indicators and sub-indicators). In this way, the results of the multi-criteria assessment can help in the decision-making process in cases where economic, social and ecological criteria are considered to be influential. © 2018 Serbian Society of Heat Transfer Engineers.",
journal = "Thermal Science",
title = "Analysis of different scenarios and sustainability measurement in the district heating sector in Serbia",
volume = "22",
number = "00 (Online first)",
pages = "298-298",
doi = "10.2298/TSCI181009298J"
}

Jovanović, M. P., Bakić, V., Vučićević, B. S.,& Turanjanin, V.. (2018). Analysis of different scenarios and sustainability measurement in the district heating sector in Serbia. in Thermal Science, 22(00 (Online first)), 298-298.
https://doi.org/10.2298/TSCI181009298J

Jovanović MP, Bakić V, Vučićević BS, Turanjanin V. Analysis of different scenarios and sustainability measurement in the district heating sector in Serbia. in Thermal Science. 2018;22(00 (Online first)):298-298.
doi:10.2298/TSCI181009298J .

Jovanović, Marina P., Bakić, Vukman, Vučićević, Biljana S., Turanjanin, Valentina, "Analysis of different scenarios and sustainability measurement in the district heating sector in Serbia" in Thermal Science, 22, no. 00 (Online first) (2018):298-298,
https://doi.org/10.2298/TSCI181009298J . .

TY  - THES
AU  - Stepanić, Nenad
PY  - 2018
UR  - http://eteze.bg.ac.rs/application/showtheses?thesesId=6341
UR  - https://fedorabg.bg.ac.rs/fedora/get/o:19015/bdef:Content/download
UR  - https://plus.sr.cobiss.net/opac7/bib/50771471
UR  - http://nardus.mpn.gov.rs/123456789/10328
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8506
AB  - Ова докторска теза обухвата истраживачки рад на унапређењу мерења топлотне проводности термоизолационих чврстих материјала у Метролошкој лабораторији за температуру и термофизичке величине (МЛТВ) Института за нуклеарне науке ВИНЧА. Топлотна проводност се, као једна од најзначајнијих термофизичких величина чврстих материјала, мери различитим експерименталним методама. Метода која код слабо проводних материјала може обезбедити резултате са најмањом могућом мерном несигурношћу је метода заштићене топле плоче и она се као референтна користи у свим најзначајнијим националним метролошким лабораторијама у свету. Експериментална поставка којом се примењује ова метода је установљена у Институту ВИНЧА још 60-их година прошлог века и била је функционална до средине 80-их. Топлотна проводност термоизолационих материјала се у том периоду мерила са релативном мерном несигурношћу од 3 % до 10 %. У складу са убрзаним развојем МЛТВ почетком овог века, као и њеним каснијим признавањем као именоване националне лабораторије за термофизичке величине, приступило се ревитализацији експерименталне поставке и унапређењу поступка одређивања топлотне проводности. У оквиру рада на овој дисертацији је унапређена како сложена мерна апаратура кроз моделовање, израду и тестирање нових елемената и система, тако и калибрациони и мерни поступак и начин обраде мерних сигнала. Као резултат широког унапређења, данас се у Институту ВИНЧА топлотна проводност термоизолационих чврстих материјала може мерити са високом тачношћу и прецизношћу, тј. малом релативном мерном несигурношћу која достиже ниво од 2 %. Тим резултатом, који је потврђен преко међународног међулабораторијског поређења извршеног у оквиру Eura-Thermal пројекта, Метролошка лабораторија за температуру и термофизичке величине Института ВИНЧА се сврстала у ред значајних светских лабораторија те врсте.
AB  - This PhD thesis implies research on improving the thermal conductivity measurement of thermal insulations in the Metrological Laboratory for Temperature and Thermophysical Properties (MLTV) of the Institute of Nuclear Sciences VINČA. Thermal conductivity, as one of the most important thermophysical properties of solid materials, is measured by various experimental methods. A method that may provide results with a lowest possible measurement uncertainty for poorly conductive materials is the guarded hot plate method and it is used as a reference technique in all most important national metrology laboratories in the world. A related experimental setup was established at the Institute VINČA in the 1960s and was functional until the mid-80s. Thermal conductivity of thermal insulation materials was measured in this period with a relative uncertainty of 3 % to 10 %. In accordance with a fast development of MLTV at the beginning of this century, as well as its subsequent recognition as the designated laboratory for thermophysical properties, a revitalization of the experimental setup and an improvement of the corresponding measurement process began. Within the scope of this dissertation, the measurement apparatus was improved through modelling, designing and testing of new elements and systems, as well as through new calibration, measuring and data reduction procedures. As a result of these improvements, today, the Institute VINČA is capable to measure the thermal conductivity of insulation materials with a high accuracy and precision, i.e. with small relative uncertainties down to a level of 2 %. With this result, which was confirmed through an international inter-laboratory comparison performed within the framework of the Eura-Thermal project, the MLTV of the Institute VINČA has been ranked among the world's leading laboratories of this kind.
PB  - Универзитет у Београду, Електротехнички факултет
T2  - Универзитет у Београду
T1  - Унапређење поступка заштићене топле плоче за одређивање топлотне проводности термоизолационих материјала
UR  - https://hdl.handle.net/21.15107/rcub_nardus_10328
ER  - 

@phdthesis{
author = "Stepanić, Nenad",
year = "2018",
abstract = "Ова докторска теза обухвата истраживачки рад на унапређењу мерења топлотне проводности термоизолационих чврстих материјала у Метролошкој лабораторији за температуру и термофизичке величине (МЛТВ) Института за нуклеарне науке ВИНЧА. Топлотна проводност се, као једна од најзначајнијих термофизичких величина чврстих материјала, мери различитим експерименталним методама. Метода која код слабо проводних материјала може обезбедити резултате са најмањом могућом мерном несигурношћу је метода заштићене топле плоче и она се као референтна користи у свим најзначајнијим националним метролошким лабораторијама у свету. Експериментална поставка којом се примењује ова метода је установљена у Институту ВИНЧА још 60-их година прошлог века и била је функционална до средине 80-их. Топлотна проводност термоизолационих материјала се у том периоду мерила са релативном мерном несигурношћу од 3 % до 10 %. У складу са убрзаним развојем МЛТВ почетком овог века, као и њеним каснијим признавањем као именоване националне лабораторије за термофизичке величине, приступило се ревитализацији експерименталне поставке и унапређењу поступка одређивања топлотне проводности. У оквиру рада на овој дисертацији је унапређена како сложена мерна апаратура кроз моделовање, израду и тестирање нових елемената и система, тако и калибрациони и мерни поступак и начин обраде мерних сигнала. Као резултат широког унапређења, данас се у Институту ВИНЧА топлотна проводност термоизолационих чврстих материјала може мерити са високом тачношћу и прецизношћу, тј. малом релативном мерном несигурношћу која достиже ниво од 2 %. Тим резултатом, који је потврђен преко међународног међулабораторијског поређења извршеног у оквиру Eura-Thermal пројекта, Метролошка лабораторија за температуру и термофизичке величине Института ВИНЧА се сврстала у ред значајних светских лабораторија те врсте., This PhD thesis implies research on improving the thermal conductivity measurement of thermal insulations in the Metrological Laboratory for Temperature and Thermophysical Properties (MLTV) of the Institute of Nuclear Sciences VINČA. Thermal conductivity, as one of the most important thermophysical properties of solid materials, is measured by various experimental methods. A method that may provide results with a lowest possible measurement uncertainty for poorly conductive materials is the guarded hot plate method and it is used as a reference technique in all most important national metrology laboratories in the world. A related experimental setup was established at the Institute VINČA in the 1960s and was functional until the mid-80s. Thermal conductivity of thermal insulation materials was measured in this period with a relative uncertainty of 3 % to 10 %. In accordance with a fast development of MLTV at the beginning of this century, as well as its subsequent recognition as the designated laboratory for thermophysical properties, a revitalization of the experimental setup and an improvement of the corresponding measurement process began. Within the scope of this dissertation, the measurement apparatus was improved through modelling, designing and testing of new elements and systems, as well as through new calibration, measuring and data reduction procedures. As a result of these improvements, today, the Institute VINČA is capable to measure the thermal conductivity of insulation materials with a high accuracy and precision, i.e. with small relative uncertainties down to a level of 2 %. With this result, which was confirmed through an international inter-laboratory comparison performed within the framework of the Eura-Thermal project, the MLTV of the Institute VINČA has been ranked among the world's leading laboratories of this kind.",
publisher = "Универзитет у Београду, Електротехнички факултет",
journal = "Универзитет у Београду",
title = "Унапређење поступка заштићене топле плоче за одређивање топлотне проводности термоизолационих материјала",
url = "https://hdl.handle.net/21.15107/rcub_nardus_10328"
}

Stepanić, N.. (2018). Унапређење поступка заштићене топле плоче за одређивање топлотне проводности термоизолационих материјала. in Универзитет у Београду
Универзитет у Београду, Електротехнички факултет..
https://hdl.handle.net/21.15107/rcub_nardus_10328

Stepanić N. Унапређење поступка заштићене топле плоче за одређивање топлотне проводности термоизолационих материјала. in Универзитет у Београду. 2018;.
https://hdl.handle.net/21.15107/rcub_nardus_10328 .

Stepanić, Nenad, "Унапређење поступка заштићене топле плоче за одређивање топлотне проводности термоизолационих материјала" in Универзитет у Београду (2018),
https://hdl.handle.net/21.15107/rcub_nardus_10328 .

TY  - JOUR
AU  - Pezo, Milada L.
AU  - Bakić, Vukman
AU  - Marković, Zoran J.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7137
AB  - The behavior of the mast is non-linear due to its slenderness and compliant guy-support system, having a tendency to lose stability and even crush suddenly. Wind load is one of the main factors affecting the stability of the structure of the mast. Structural assessment of the different mast configurations has been investigated in the past. Furthermore, European standards EN 1993-3-1:2006 and EN 1993-1-6:2007 already provides some guidelines about the basis of structural analysis of masts and towers. This paper presents the results of numerical simulations of a guyed mast exposed to wind action using finite element method. Structural analyses were performed for three different constant wind loads, modal analysis provides the values of natural frequency and mode shapes, while the stability analysis was performed for the first three buckling load factor values. The motivation for this study is to investigate the contribution of finite element method to structural analysis of a lattice structure such as guyed mast as an alternative and/or improvement to the literature and codes.
T2  - Thermal Science
T1  - Structural Analysis of Guyed Mast Exposed to Wind Action
VL  - 20
SP  - S1473
EP  - S1483
DO  - 10.2298/TSCI16S5473P
ER  - 

@article{
author = "Pezo, Milada L. and Bakić, Vukman and Marković, Zoran J.",
year = "2016",
abstract = "The behavior of the mast is non-linear due to its slenderness and compliant guy-support system, having a tendency to lose stability and even crush suddenly. Wind load is one of the main factors affecting the stability of the structure of the mast. Structural assessment of the different mast configurations has been investigated in the past. Furthermore, European standards EN 1993-3-1:2006 and EN 1993-1-6:2007 already provides some guidelines about the basis of structural analysis of masts and towers. This paper presents the results of numerical simulations of a guyed mast exposed to wind action using finite element method. Structural analyses were performed for three different constant wind loads, modal analysis provides the values of natural frequency and mode shapes, while the stability analysis was performed for the first three buckling load factor values. The motivation for this study is to investigate the contribution of finite element method to structural analysis of a lattice structure such as guyed mast as an alternative and/or improvement to the literature and codes.",
journal = "Thermal Science",
title = "Structural Analysis of Guyed Mast Exposed to Wind Action",
volume = "20",
pages = "S1473-S1483",
doi = "10.2298/TSCI16S5473P"
}

Pezo, M. L., Bakić, V.,& Marković, Z. J.. (2016). Structural Analysis of Guyed Mast Exposed to Wind Action. in Thermal Science, 20, S1473-S1483.
https://doi.org/10.2298/TSCI16S5473P

Pezo ML, Bakić V, Marković ZJ. Structural Analysis of Guyed Mast Exposed to Wind Action. in Thermal Science. 2016;20:S1473-S1483.
doi:10.2298/TSCI16S5473P .

Pezo, Milada L., Bakić, Vukman, Marković, Zoran J., "Structural Analysis of Guyed Mast Exposed to Wind Action" in Thermal Science, 20 (2016):S1473-S1483,
https://doi.org/10.2298/TSCI16S5473P . .

TY  - JOUR
AU  - Mirkov, Nikola S.
AU  - Stevanović, Žarko M.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1146
AB  - In this paper we validate an improved finite volume approximation of Reynolds averaged Navier-Stokes equations for simulation of wind flows in body-fitted grids generated by algebraic extrusion from digital terrain elevation data, proposed in Mirkov et. al. [1]. The approach is based on second-order accurate finite volume method with collocated variable arrangement and pressure-velocity coupling trough SIMPLE algorithm. The main objective is the attenuation of spurious pressure field oscillations in regions with discontinuity in grid line slopes, as encountered in grids representing highly non-uniform terrains. Moreover, the approach relaxes the need for grid generation based on elliptic partial differential equation or grid smoothing by applying fixed point iterations (i. e. Gauss-Seidel) to initial grid node positions resulting from algebraic grid generators. Drawbacks of previous approaches which ignored treatment of finite volume grid cell cases with intersection point offset in non-orthogonality corrections are removed. Application to real-life wind farm project at Dobric (Svrljig, Serbia) is used to assess the effectiveness of the method. The results validate the view in which accurate discretization of governing equations play more important role than the choice of turbulence modeling closures.
T2  - Thermal Science
T1  - New non-orthogonality treatment for atmospheric boundary layer flow simulation above highly non-uniform terrains
VL  - 20
SP  - S223
EP  - S233
DO  - 10.2298/TSCI151025197M
ER  - 

@article{
author = "Mirkov, Nikola S. and Stevanović, Žarko M.",
year = "2016",
abstract = "In this paper we validate an improved finite volume approximation of Reynolds averaged Navier-Stokes equations for simulation of wind flows in body-fitted grids generated by algebraic extrusion from digital terrain elevation data, proposed in Mirkov et. al. [1]. The approach is based on second-order accurate finite volume method with collocated variable arrangement and pressure-velocity coupling trough SIMPLE algorithm. The main objective is the attenuation of spurious pressure field oscillations in regions with discontinuity in grid line slopes, as encountered in grids representing highly non-uniform terrains. Moreover, the approach relaxes the need for grid generation based on elliptic partial differential equation or grid smoothing by applying fixed point iterations (i. e. Gauss-Seidel) to initial grid node positions resulting from algebraic grid generators. Drawbacks of previous approaches which ignored treatment of finite volume grid cell cases with intersection point offset in non-orthogonality corrections are removed. Application to real-life wind farm project at Dobric (Svrljig, Serbia) is used to assess the effectiveness of the method. The results validate the view in which accurate discretization of governing equations play more important role than the choice of turbulence modeling closures.",
journal = "Thermal Science",
title = "New non-orthogonality treatment for atmospheric boundary layer flow simulation above highly non-uniform terrains",
volume = "20",
pages = "S223-S233",
doi = "10.2298/TSCI151025197M"
}

Mirkov, N. S.,& Stevanović, Ž. M.. (2016). New non-orthogonality treatment for atmospheric boundary layer flow simulation above highly non-uniform terrains. in Thermal Science, 20, S223-S233.
https://doi.org/10.2298/TSCI151025197M

Mirkov NS, Stevanović ŽM. New non-orthogonality treatment for atmospheric boundary layer flow simulation above highly non-uniform terrains. in Thermal Science. 2016;20:S223-S233.
doi:10.2298/TSCI151025197M .

Mirkov, Nikola S., Stevanović, Žarko M., "New non-orthogonality treatment for atmospheric boundary layer flow simulation above highly non-uniform terrains" in Thermal Science, 20 (2016):S223-S233,
https://doi.org/10.2298/TSCI151025197M . .

TY  - JOUR
AU  - Stojković, Saša M.
AU  - Bakić, Vukman
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1149
AB  - The paper presents the results of a technical and economic analysis of three stand-alone hybrid power systems based on renewable energy sources which supply a specific group of low-power consumers. This particular case includes measuring sensors and obstacle lights on a meteorological mast for wind measurements requiring an uninterrupted power supply in cold climate conditions. Although these low-power (100 W) measuring sensors and obstacle lights use little energy, their energy consumption is not the same as the available solar energy obtained on a daily or seasonal basis. In the paper, complementarily of renewable energy sources was analysed, as well as one of short-term lead-acid battery based storage and seasonal, hydrogen-based (electrolyses, H-2 tank, and fuel cells) storage. These relatively complex power systems were proposed earlier for high-power consumers only, while this study specifically highlights the role of the hydrogen system for supplying low-power consumers. The analysis employed a numerical simulation method using the HOMER software tool. The results of the analysis suggest that solar and wind-solar systems, which involve meteorological conditions as referred to in this paper, include a relatively large number of lead acid batteries. Additionally, the analysis suggests that the use of hydrogen power systems for supplying low power-consumers is entirely justifiable, as it significantly reduces the number of batteries (two at minimum in this particular case). It was shown that the increase in costs induced by the hydrogen system is acceptable.
T2  - Thermal Science
T1  - Techno-Economic Analysis of Stand-Alone Photovoltaic/Wind/Battery/Hydrogen Systems for Very Small-Scale Applications
VL  - 20
SP  - S261
EP  - S273
DO  - 10.2298/TSCI150308195S
ER  - 

@article{
author = "Stojković, Saša M. and Bakić, Vukman",
year = "2016",
abstract = "The paper presents the results of a technical and economic analysis of three stand-alone hybrid power systems based on renewable energy sources which supply a specific group of low-power consumers. This particular case includes measuring sensors and obstacle lights on a meteorological mast for wind measurements requiring an uninterrupted power supply in cold climate conditions. Although these low-power (100 W) measuring sensors and obstacle lights use little energy, their energy consumption is not the same as the available solar energy obtained on a daily or seasonal basis. In the paper, complementarily of renewable energy sources was analysed, as well as one of short-term lead-acid battery based storage and seasonal, hydrogen-based (electrolyses, H-2 tank, and fuel cells) storage. These relatively complex power systems were proposed earlier for high-power consumers only, while this study specifically highlights the role of the hydrogen system for supplying low-power consumers. The analysis employed a numerical simulation method using the HOMER software tool. The results of the analysis suggest that solar and wind-solar systems, which involve meteorological conditions as referred to in this paper, include a relatively large number of lead acid batteries. Additionally, the analysis suggests that the use of hydrogen power systems for supplying low power-consumers is entirely justifiable, as it significantly reduces the number of batteries (two at minimum in this particular case). It was shown that the increase in costs induced by the hydrogen system is acceptable.",
journal = "Thermal Science",
title = "Techno-Economic Analysis of Stand-Alone Photovoltaic/Wind/Battery/Hydrogen Systems for Very Small-Scale Applications",
volume = "20",
pages = "S261-S273",
doi = "10.2298/TSCI150308195S"
}

Stojković, S. M.,& Bakić, V.. (2016). Techno-Economic Analysis of Stand-Alone Photovoltaic/Wind/Battery/Hydrogen Systems for Very Small-Scale Applications. in Thermal Science, 20, S261-S273.
https://doi.org/10.2298/TSCI150308195S

Stojković SM, Bakić V. Techno-Economic Analysis of Stand-Alone Photovoltaic/Wind/Battery/Hydrogen Systems for Very Small-Scale Applications. in Thermal Science. 2016;20:S261-S273.
doi:10.2298/TSCI150308195S .

Stojković, Saša M., Bakić, Vukman, "Techno-Economic Analysis of Stand-Alone Photovoltaic/Wind/Battery/Hydrogen Systems for Very Small-Scale Applications" in Thermal Science, 20 (2016):S261-S273,
https://doi.org/10.2298/TSCI150308195S . .

TY  - JOUR
AU  - Bakić, Vukman
AU  - Pezo, Milada L.
AU  - Stojković, Saša M.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1689
AB  - In this paper technical and economic analysis of grid-connected PV/Wind energy systems located in the Republic of Serbia are presented. The technical and economic data, of the various grid-connected PV/Wind hybrid energy systems for three different locations: Novi Sad, Belgrade and Kopaonik, using the transient simulations software TRNSYS and HOMER were obtained. The results obtained in this paper show that locations and technical characteristics of the energy systems have an important influence on the amount of delivering electrical power to the grid. The CO2 emissions reductions, obtained on the basis of delivered electrical power to distribution networks are also analyzed. Economic analysis is carried out using Life Cycling Cost (LCC) method. The adoption and implementation of feed-in tariffs have a significant role in enhancing the implementation of technologies that use renewable energy resources.
T2  - FME Transactions
T1  - Technical and Economic Analysis of Grid-Connected PV/Wind Energy Stations in the Republic of Serbia Under Varying Climatic Conditions
VL  - 44
IS  - 1
SP  - 71
EP  - 82
DO  - 10.5937/fmet1601071B
ER  - 

@article{
author = "Bakić, Vukman and Pezo, Milada L. and Stojković, Saša M.",
year = "2016",
abstract = "In this paper technical and economic analysis of grid-connected PV/Wind energy systems located in the Republic of Serbia are presented. The technical and economic data, of the various grid-connected PV/Wind hybrid energy systems for three different locations: Novi Sad, Belgrade and Kopaonik, using the transient simulations software TRNSYS and HOMER were obtained. The results obtained in this paper show that locations and technical characteristics of the energy systems have an important influence on the amount of delivering electrical power to the grid. The CO2 emissions reductions, obtained on the basis of delivered electrical power to distribution networks are also analyzed. Economic analysis is carried out using Life Cycling Cost (LCC) method. The adoption and implementation of feed-in tariffs have a significant role in enhancing the implementation of technologies that use renewable energy resources.",
journal = "FME Transactions",
title = "Technical and Economic Analysis of Grid-Connected PV/Wind Energy Stations in the Republic of Serbia Under Varying Climatic Conditions",
volume = "44",
number = "1",
pages = "71-82",
doi = "10.5937/fmet1601071B"
}

Bakić, V., Pezo, M. L.,& Stojković, S. M.. (2016). Technical and Economic Analysis of Grid-Connected PV/Wind Energy Stations in the Republic of Serbia Under Varying Climatic Conditions. in FME Transactions, 44(1), 71-82.
https://doi.org/10.5937/fmet1601071B

Bakić V, Pezo ML, Stojković SM. Technical and Economic Analysis of Grid-Connected PV/Wind Energy Stations in the Republic of Serbia Under Varying Climatic Conditions. in FME Transactions. 2016;44(1):71-82.
doi:10.5937/fmet1601071B .

Bakić, Vukman, Pezo, Milada L., Stojković, Saša M., "Technical and Economic Analysis of Grid-Connected PV/Wind Energy Stations in the Republic of Serbia Under Varying Climatic Conditions" in FME Transactions, 44, no. 1 (2016):71-82,
https://doi.org/10.5937/fmet1601071B . .

TY  - JOUR
AU  - Mirkov, Nikola S.
AU  - Rasuo, Bosko
AU  - Kenjeres, Sasa
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/268
AB  - This article presents a new and substantially improved finite volume procedure for simulation of incompressible flows on non-orthogonal grids. Cell-centered least-squares gradients are obtained in a robust and highly accurate way. A new discretization of the diffusive terms is employed, which is based on extension of the original cell-face gradient interpolation and is more suitable for complex grid distortions. A flexible flux-limited interpolation of dependent variables on distorted computational grids is introduced. An efficient preconditioner for Krylov method solution of linear systems is proposed, which substantially improves the solution of Poisson equation for pressure correction. The pressure-correction algorithm is adapted for efficient convergence on highly complex grids using a sequence of non-orthogonal corrector solutions and its effect on iteration convergence is analyzed. The non-orthogonalities treated by current procedure are more accustomed to numerical grids generated from a real complex terrain elevation data. The main focus is on the simulation of atmospheric micro-scale flows pertinent to wind energy application.
T2  - Journal of Computational Physics
T1  - On the improved finite volume procedure for simulation of turbulent flows over real complex terrains
VL  - 287
SP  - 18
EP  - 45
DO  - 10.1016/j.jcp.2015.02.001
ER  - 

@article{
author = "Mirkov, Nikola S. and Rasuo, Bosko and Kenjeres, Sasa",
year = "2015",
abstract = "This article presents a new and substantially improved finite volume procedure for simulation of incompressible flows on non-orthogonal grids. Cell-centered least-squares gradients are obtained in a robust and highly accurate way. A new discretization of the diffusive terms is employed, which is based on extension of the original cell-face gradient interpolation and is more suitable for complex grid distortions. A flexible flux-limited interpolation of dependent variables on distorted computational grids is introduced. An efficient preconditioner for Krylov method solution of linear systems is proposed, which substantially improves the solution of Poisson equation for pressure correction. The pressure-correction algorithm is adapted for efficient convergence on highly complex grids using a sequence of non-orthogonal corrector solutions and its effect on iteration convergence is analyzed. The non-orthogonalities treated by current procedure are more accustomed to numerical grids generated from a real complex terrain elevation data. The main focus is on the simulation of atmospheric micro-scale flows pertinent to wind energy application.",
journal = "Journal of Computational Physics",
title = "On the improved finite volume procedure for simulation of turbulent flows over real complex terrains",
volume = "287",
pages = "18-45",
doi = "10.1016/j.jcp.2015.02.001"
}

Mirkov, N. S., Rasuo, B.,& Kenjeres, S.. (2015). On the improved finite volume procedure for simulation of turbulent flows over real complex terrains. in Journal of Computational Physics, 287, 18-45.
https://doi.org/10.1016/j.jcp.2015.02.001

Mirkov NS, Rasuo B, Kenjeres S. On the improved finite volume procedure for simulation of turbulent flows over real complex terrains. in Journal of Computational Physics. 2015;287:18-45.
doi:10.1016/j.jcp.2015.02.001 .

Mirkov, Nikola S., Rasuo, Bosko, Kenjeres, Sasa, "On the improved finite volume procedure for simulation of turbulent flows over real complex terrains" in Journal of Computational Physics, 287 (2015):18-45,
https://doi.org/10.1016/j.jcp.2015.02.001 . .

TY  - JOUR
AU  - Živković, Marija M.
AU  - Jovašević-Stojanović, Milena
AU  - Cvetković, Anka
AU  - Lazović, Ivan
AU  - Tasic, Visa
AU  - Stevanović, Žana
AU  - Gržetić, Ivan A.
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/549
AB  - This study investigated seasonal variation of PAHs and their partition between gas and particulate-bounded phases in indoor and outdoor air in 4 schools In Serbia located at different locations. The sampling campaigns were conducted during one workweek at each school successively. Campaigns were conducted in schools during heating and non-heating seasons in December 2011 and June 2012. Seasonal variations of gas and particle-bounded PAHs concentrations were observed with higher levels during heating season. The highest total PAH values were associated with the gas phase in both sampling periods. The total PAHs concentration at indoor and at the outdoor sites, during heating season, ranged from 88.45 to 447.72 ng/m(3) and 201.69 to 1017.15 ng/m(3), respectively. During non-heating season, the total PAHs concentration ranged from 36.91 to 271.57 ng/m(3) in Indoor environment and 27.00 to 132.32 ng/m(3) in outdoor environment. Most of the I/O ratios were less than 1, which indicated that the indoor PAHs were mostly from outdoor sources. The use of diagnostic ratio showed that traffic emission and coal combustion are the major sources of PAHs. Only the diagnostic ratios for the school located near the industrial area showed significant deviation compared to other schools.
T2  - Chemical Industry and Chemical Engineering Quarterly / CICEQ
T1  - Pahs Levels in Gas and Particle-Bound Phase in Schools At Different Locations in Serbia
VL  - 21
IS  - 1
SP  - 159
EP  - 167
DO  - 10.2298/CICEQ140206016Z
ER  - 

@article{
author = "Živković, Marija M. and Jovašević-Stojanović, Milena and Cvetković, Anka and Lazović, Ivan and Tasic, Visa and Stevanović, Žana and Gržetić, Ivan A.",
year = "2015",
abstract = "This study investigated seasonal variation of PAHs and their partition between gas and particulate-bounded phases in indoor and outdoor air in 4 schools In Serbia located at different locations. The sampling campaigns were conducted during one workweek at each school successively. Campaigns were conducted in schools during heating and non-heating seasons in December 2011 and June 2012. Seasonal variations of gas and particle-bounded PAHs concentrations were observed with higher levels during heating season. The highest total PAH values were associated with the gas phase in both sampling periods. The total PAHs concentration at indoor and at the outdoor sites, during heating season, ranged from 88.45 to 447.72 ng/m(3) and 201.69 to 1017.15 ng/m(3), respectively. During non-heating season, the total PAHs concentration ranged from 36.91 to 271.57 ng/m(3) in Indoor environment and 27.00 to 132.32 ng/m(3) in outdoor environment. Most of the I/O ratios were less than 1, which indicated that the indoor PAHs were mostly from outdoor sources. The use of diagnostic ratio showed that traffic emission and coal combustion are the major sources of PAHs. Only the diagnostic ratios for the school located near the industrial area showed significant deviation compared to other schools.",
journal = "Chemical Industry and Chemical Engineering Quarterly / CICEQ",
title = "Pahs Levels in Gas and Particle-Bound Phase in Schools At Different Locations in Serbia",
volume = "21",
number = "1",
pages = "159-167",
doi = "10.2298/CICEQ140206016Z"
}

Živković, M. M., Jovašević-Stojanović, M., Cvetković, A., Lazović, I., Tasic, V., Stevanović, Ž.,& Gržetić, I. A.. (2015). Pahs Levels in Gas and Particle-Bound Phase in Schools At Different Locations in Serbia. in Chemical Industry and Chemical Engineering Quarterly / CICEQ, 21(1), 159-167.
https://doi.org/10.2298/CICEQ140206016Z

Živković MM, Jovašević-Stojanović M, Cvetković A, Lazović I, Tasic V, Stevanović Ž, Gržetić IA. Pahs Levels in Gas and Particle-Bound Phase in Schools At Different Locations in Serbia. in Chemical Industry and Chemical Engineering Quarterly / CICEQ. 2015;21(1):159-167.
doi:10.2298/CICEQ140206016Z .

Živković, Marija M., Jovašević-Stojanović, Milena, Cvetković, Anka, Lazović, Ivan, Tasic, Visa, Stevanović, Žana, Gržetić, Ivan A., "Pahs Levels in Gas and Particle-Bound Phase in Schools At Different Locations in Serbia" in Chemical Industry and Chemical Engineering Quarterly / CICEQ, 21, no. 1 (2015):159-167,
https://doi.org/10.2298/CICEQ140206016Z . .

TY  - JOUR
AU  - Kastratovic, Gordana
AU  - Vidanovic, Nenad
AU  - Bakić, Vukman
AU  - Rasuo, Basko
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/107
AB  - This paper explores some aspects of finite element modeling of 7 x 19 IWS (wire rope with Independent wire strand core), as mostly used sling wire rope. First, the 1 x 19 stainless steel wire strand core was investigated. The numerical analysis was carried out by the finite element method. In this analysis two different types of contacts were investigated: bonded and frictional contact. The strand core was subjected to two different types of axial loading. The obtained results were compared with the solutions calculated from the available literature. Finally, using the advanced modeling techniques, the parametric 3D model of 7 x 19 IWS was also analyzed by using the finite element method, in order to provide a better understanding and, hence, prediction, of the mechanical behavior of the sling wire ropes. (c) 2014 Elsevier Ltd. All rights reserved.
T2  - Ocean Engineering
T1  - On finite element analysis of sling wire rope subjected to axial loading
VL  - 88
SP  - 480
EP  - 487
DO  - 10.1016/j.oceaneng.2014.07.014
ER  - 

@article{
author = "Kastratovic, Gordana and Vidanovic, Nenad and Bakić, Vukman and Rasuo, Basko",
year = "2014",
abstract = "This paper explores some aspects of finite element modeling of 7 x 19 IWS (wire rope with Independent wire strand core), as mostly used sling wire rope. First, the 1 x 19 stainless steel wire strand core was investigated. The numerical analysis was carried out by the finite element method. In this analysis two different types of contacts were investigated: bonded and frictional contact. The strand core was subjected to two different types of axial loading. The obtained results were compared with the solutions calculated from the available literature. Finally, using the advanced modeling techniques, the parametric 3D model of 7 x 19 IWS was also analyzed by using the finite element method, in order to provide a better understanding and, hence, prediction, of the mechanical behavior of the sling wire ropes. (c) 2014 Elsevier Ltd. All rights reserved.",
journal = "Ocean Engineering",
title = "On finite element analysis of sling wire rope subjected to axial loading",
volume = "88",
pages = "480-487",
doi = "10.1016/j.oceaneng.2014.07.014"
}

Kastratovic, G., Vidanovic, N., Bakić, V.,& Rasuo, B.. (2014). On finite element analysis of sling wire rope subjected to axial loading. in Ocean Engineering, 88, 480-487.
https://doi.org/10.1016/j.oceaneng.2014.07.014

Kastratovic G, Vidanovic N, Bakić V, Rasuo B. On finite element analysis of sling wire rope subjected to axial loading. in Ocean Engineering. 2014;88:480-487.
doi:10.1016/j.oceaneng.2014.07.014 .

Kastratovic, Gordana, Vidanovic, Nenad, Bakić, Vukman, Rasuo, Basko, "On finite element analysis of sling wire rope subjected to axial loading" in Ocean Engineering, 88 (2014):480-487,
https://doi.org/10.1016/j.oceaneng.2014.07.014 . .

TY  - JOUR
AU  - Pezo, Milada L.
AU  - Bakić, Vukman
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5940
AB  - Guyed masts are used for meteorological measurements, in the telecommunication industry for wireless communication or for power transmission. For a guyed mast, wind load is the main factor affecting the stability of the structure. Determination of drag coefficient for lattice structure has been investigate in past. ESDU 81027 and 81028 and Eurocode 3 Part 3.1 give already some detailed information of the aerodynamic drag coefficient of lattice mast structures with circular members. Only certain types of lattice masts covers literature and codes tend to be conservative due to the necessity of simplicity. But in this study is presented numerical method using Computational Fluid Dynamics (CFD) to determine drag coefficient. The motivation for this study to investigate what CFD can offer or contribute to determine the aerodynamic drag forces of lattice mast structures as a supplement or even alternative to literature and codes. This would be in particular of interest for design engineers in the field of mast structures. Three-dimensional numerical simulations of one segment of a mast exposed to a wind action with three models of turbulence are performed. Three models of turbulence: standard k-epsilon model, RNG k-epsilon model and Reynolds stress model were used and compared with available experimental results. Drag coefficient was calculated based on integration surface pressure distribution, flow field and a reference area. Modeling was performed for four wind velocities, 10 m/s, 20 m/s, 30 m/s and 40 m/s. Reynolds number for those velocities corresponds to turbulence flow. Direction of inlet velocity is also variable, e.g. there are two angles of attack. (C) 2014 Elsevier Ltd. All rights reserved.
T2  - Engineering Structures
T1  - Numerical determination of drag coefficient for guyed mast exposed to wind action
VL  - 62-63
SP  - 98
EP  - 104
DO  - 10.1016/j.engstruct.2014.01.025
ER  - 

@article{
author = "Pezo, Milada L. and Bakić, Vukman",
year = "2014",
abstract = "Guyed masts are used for meteorological measurements, in the telecommunication industry for wireless communication or for power transmission. For a guyed mast, wind load is the main factor affecting the stability of the structure. Determination of drag coefficient for lattice structure has been investigate in past. ESDU 81027 and 81028 and Eurocode 3 Part 3.1 give already some detailed information of the aerodynamic drag coefficient of lattice mast structures with circular members. Only certain types of lattice masts covers literature and codes tend to be conservative due to the necessity of simplicity. But in this study is presented numerical method using Computational Fluid Dynamics (CFD) to determine drag coefficient. The motivation for this study to investigate what CFD can offer or contribute to determine the aerodynamic drag forces of lattice mast structures as a supplement or even alternative to literature and codes. This would be in particular of interest for design engineers in the field of mast structures. Three-dimensional numerical simulations of one segment of a mast exposed to a wind action with three models of turbulence are performed. Three models of turbulence: standard k-epsilon model, RNG k-epsilon model and Reynolds stress model were used and compared with available experimental results. Drag coefficient was calculated based on integration surface pressure distribution, flow field and a reference area. Modeling was performed for four wind velocities, 10 m/s, 20 m/s, 30 m/s and 40 m/s. Reynolds number for those velocities corresponds to turbulence flow. Direction of inlet velocity is also variable, e.g. there are two angles of attack. (C) 2014 Elsevier Ltd. All rights reserved.",
journal = "Engineering Structures",
title = "Numerical determination of drag coefficient for guyed mast exposed to wind action",
volume = "62-63",
pages = "98-104",
doi = "10.1016/j.engstruct.2014.01.025"
}

Pezo, M. L.,& Bakić, V.. (2014). Numerical determination of drag coefficient for guyed mast exposed to wind action. in Engineering Structures, 62-63, 98-104.
https://doi.org/10.1016/j.engstruct.2014.01.025

Pezo ML, Bakić V. Numerical determination of drag coefficient for guyed mast exposed to wind action. in Engineering Structures. 2014;62-63:98-104.
doi:10.1016/j.engstruct.2014.01.025 .

Pezo, Milada L., Bakić, Vukman, "Numerical determination of drag coefficient for guyed mast exposed to wind action" in Engineering Structures, 62-63 (2014):98-104,
https://doi.org/10.1016/j.engstruct.2014.01.025 . .

TY  - THES
AU  - Vučićević, Biljana S.
PY  - 2014
UR  - http://eteze.ni.ac.rs/application/showtheses?thesesId=1276
UR  - https://fedorani.ni.ac.rs/fedora/get/o:851/bdef:Content/download
UR  - http://vbs.rs/scripts/cobiss?command=DISPLAY&base=70052&RID=533590678
UR  - http://nardus.mpn.gov.rs/123456789/3894
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7270
AB  - Cities are very high populated urban areas and consequently very large consumers of finalenergy. Their main characteristic is the largest share in energy consumed by residentialbuilding sector. Therefore, paying attention to the energy use assessment in residentialbuilding sector, at the same time with assessing quality of living, is especially important.Indicators of sustainable development represent essential characteristics for evaluating energyconsumption and living quality in residential buildings.In this paper qualitative characterization of the considered objects is performed based on theperiod of construction (1946-1980 and 1981-2006), type of heating system (electricity,district heating and fossil fuels) and type of object (single family houses and apartments) forthe city of Belgrade. Representative sample was taken into account and, based on thequalitative characterization, divided in nine subgroups (options). Eleven economic, social andenvironmental subindicators were selected and calculated for all chosen options to presentenergy consumption necessary to meet the needs of occupants for space heating, hot waterproduction, cooking, household electrical appliances, indoor air quality, living space, etc.Multicriteria analysis, having application in decision making policies, was used to evaluatesustainability of different residential options through sustainability index calculation. Thismathematical procedure was conducted by agglomeration of normalized subindicators´values into economic, environmental and social indicators (first level) and agglomeration ofindicators into sustainability index (second level).In order to investigate the effect of nonlinearity on the sub-indicators' agglomeration, thechange in nonlinearity was introduced in the procedure. Normalized sub-indicators areobtained by selection of the appropriate linear (θ1= θ2=... =θ11=1) or non-linear parameters(θ1, θ2,..., θ11; θj≠1). Sustainability index and it´s standard deviation were calculated fordifferent values of the parameter θ and each option. The functional dependence between thesustainability index and the associated standard deviation of the θ parameter (characterizingthe way of normalization) was obtained.
PB  - Универзитет у Нишу, Машински факултет
T2  - Универзитет у Нишу
T1  - Analiza i ocena održivog razvoja energetskog sistema u zgradarstvu
T1  - Analysis and evaluation of sustainable development of the energy systems in buildings
UR  - https://hdl.handle.net/21.15107/rcub_nardus_3894
ER  - 

@phdthesis{
author = "Vučićević, Biljana S.",
year = "2014",
abstract = "Cities are very high populated urban areas and consequently very large consumers of finalenergy. Their main characteristic is the largest share in energy consumed by residentialbuilding sector. Therefore, paying attention to the energy use assessment in residentialbuilding sector, at the same time with assessing quality of living, is especially important.Indicators of sustainable development represent essential characteristics for evaluating energyconsumption and living quality in residential buildings.In this paper qualitative characterization of the considered objects is performed based on theperiod of construction (1946-1980 and 1981-2006), type of heating system (electricity,district heating and fossil fuels) and type of object (single family houses and apartments) forthe city of Belgrade. Representative sample was taken into account and, based on thequalitative characterization, divided in nine subgroups (options). Eleven economic, social andenvironmental subindicators were selected and calculated for all chosen options to presentenergy consumption necessary to meet the needs of occupants for space heating, hot waterproduction, cooking, household electrical appliances, indoor air quality, living space, etc.Multicriteria analysis, having application in decision making policies, was used to evaluatesustainability of different residential options through sustainability index calculation. Thismathematical procedure was conducted by agglomeration of normalized subindicators´values into economic, environmental and social indicators (first level) and agglomeration ofindicators into sustainability index (second level).In order to investigate the effect of nonlinearity on the sub-indicators' agglomeration, thechange in nonlinearity was introduced in the procedure. Normalized sub-indicators areobtained by selection of the appropriate linear (θ1= θ2=... =θ11=1) or non-linear parameters(θ1, θ2,..., θ11; θj≠1). Sustainability index and it´s standard deviation were calculated fordifferent values of the parameter θ and each option. The functional dependence between thesustainability index and the associated standard deviation of the θ parameter (characterizingthe way of normalization) was obtained.",
publisher = "Универзитет у Нишу, Машински факултет",
journal = "Универзитет у Нишу",
title = "Analiza i ocena održivog razvoja energetskog sistema u zgradarstvu, Analysis and evaluation of sustainable development of the energy systems in buildings",
url = "https://hdl.handle.net/21.15107/rcub_nardus_3894"
}

Vučićević, B. S.. (2014). Analiza i ocena održivog razvoja energetskog sistema u zgradarstvu. in Универзитет у Нишу
Универзитет у Нишу, Машински факултет..
https://hdl.handle.net/21.15107/rcub_nardus_3894

Vučićević BS. Analiza i ocena održivog razvoja energetskog sistema u zgradarstvu. in Универзитет у Нишу. 2014;.
https://hdl.handle.net/21.15107/rcub_nardus_3894 .

Vučićević, Biljana S., "Analiza i ocena održivog razvoja energetskog sistema u zgradarstvu" in Универзитет у Нишу (2014),
https://hdl.handle.net/21.15107/rcub_nardus_3894 .

TY  - JOUR
AU  - Bakić, Vukman
AU  - Pezo, Milada L.
AU  - Jovanović, Marina P.
AU  - Turanjanin, Valentina
AU  - Vučićević, Biljana S.
AU  - Mirkov, Nikola S.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5063
AB  - The technical analysis of a hybrid wind-photovoltaic energy system with hydrogen gas storage was studied. The market for the distributed power generation based on renewable energy is increasing, particularly for the standalone minigrid applications. The main design components of photovoltaic/wind hybrid system are the photovoltaic panels, the wind turbine and an alkaline electrolyzer with tank. The technical analysis is based on the transient system simulation program TRNSYS 16. The study is realized using the meteorological data for a Typical Metrological Year for region of Novi Sad, Belgrade cities, and Kopaonik national park in Serbia. The purpose of the study is to design a realistic energy system that maximizes the use of renewable energy and minimizes the use of fossil fuels. The reduction in the CO2 emissions is also analyzed in the paper.
T2  - Thermal Science
T1  - Technical Analysis of Photovoltaic/Wind Systems with Hydrogen Storage
VL  - 16
IS  - 3
SP  - 865
EP  - 875
DO  - 10.2298/TSCI120306132B
ER  - 

@article{
author = "Bakić, Vukman and Pezo, Milada L. and Jovanović, Marina P. and Turanjanin, Valentina and Vučićević, Biljana S. and Mirkov, Nikola S.",
year = "2012",
abstract = "The technical analysis of a hybrid wind-photovoltaic energy system with hydrogen gas storage was studied. The market for the distributed power generation based on renewable energy is increasing, particularly for the standalone minigrid applications. The main design components of photovoltaic/wind hybrid system are the photovoltaic panels, the wind turbine and an alkaline electrolyzer with tank. The technical analysis is based on the transient system simulation program TRNSYS 16. The study is realized using the meteorological data for a Typical Metrological Year for region of Novi Sad, Belgrade cities, and Kopaonik national park in Serbia. The purpose of the study is to design a realistic energy system that maximizes the use of renewable energy and minimizes the use of fossil fuels. The reduction in the CO2 emissions is also analyzed in the paper.",
journal = "Thermal Science",
title = "Technical Analysis of Photovoltaic/Wind Systems with Hydrogen Storage",
volume = "16",
number = "3",
pages = "865-875",
doi = "10.2298/TSCI120306132B"
}

Bakić, V., Pezo, M. L., Jovanović, M. P., Turanjanin, V., Vučićević, B. S.,& Mirkov, N. S.. (2012). Technical Analysis of Photovoltaic/Wind Systems with Hydrogen Storage. in Thermal Science, 16(3), 865-875.
https://doi.org/10.2298/TSCI120306132B

Bakić V, Pezo ML, Jovanović MP, Turanjanin V, Vučićević BS, Mirkov NS. Technical Analysis of Photovoltaic/Wind Systems with Hydrogen Storage. in Thermal Science. 2012;16(3):865-875.
doi:10.2298/TSCI120306132B .

Bakić, Vukman, Pezo, Milada L., Jovanović, Marina P., Turanjanin, Valentina, Vučićević, Biljana S., Mirkov, Nikola S., "Technical Analysis of Photovoltaic/Wind Systems with Hydrogen Storage" in Thermal Science, 16, no. 3 (2012):865-875,
https://doi.org/10.2298/TSCI120306132B . .

TY  - JOUR
AU  - Bakić, Vukman
AU  - Pezo, Milada L.
AU  - Stevanović, Žana
AU  - Živković, Marija M.
AU  - Grubor, Borislav
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5054
AB  - In this paper, a PV/Wind integrated hybrid power energy system is analyzed using the dynamical simulation method. The market for the distributed power generation based on renewable energy is increasing, particularly for the standalone mini-grid applications. The main design components of PV/Wind hybrid system are the PV panels and the wind turbine. The case study is realized using the meteorological data for a Typical Metrological Year (TMY) for the city of Belgrade, in Serbia. The dynamical analysis is based on the transient system simulation program TRNSYS 16. The purpose of the study is to design a realistic energy system that maximizes the use of renewable energy and minimizes the use of fossil fuels. The reduction in the CO2 emissions is also analyzed in the paper. (C) 2011 Elsevier Ltd. All rights reserved.
T2  - Energy
T1  - Dynamical simulation of PV/Wind hybrid energy conversion system
VL  - 45
IS  - 1
SP  - 324
EP  - 328
DO  - 10.1016/j.energy.2011.11.063
ER  - 

@article{
author = "Bakić, Vukman and Pezo, Milada L. and Stevanović, Žana and Živković, Marija M. and Grubor, Borislav",
year = "2012",
abstract = "In this paper, a PV/Wind integrated hybrid power energy system is analyzed using the dynamical simulation method. The market for the distributed power generation based on renewable energy is increasing, particularly for the standalone mini-grid applications. The main design components of PV/Wind hybrid system are the PV panels and the wind turbine. The case study is realized using the meteorological data for a Typical Metrological Year (TMY) for the city of Belgrade, in Serbia. The dynamical analysis is based on the transient system simulation program TRNSYS 16. The purpose of the study is to design a realistic energy system that maximizes the use of renewable energy and minimizes the use of fossil fuels. The reduction in the CO2 emissions is also analyzed in the paper. (C) 2011 Elsevier Ltd. All rights reserved.",
journal = "Energy",
title = "Dynamical simulation of PV/Wind hybrid energy conversion system",
volume = "45",
number = "1",
pages = "324-328",
doi = "10.1016/j.energy.2011.11.063"
}

Bakić, V., Pezo, M. L., Stevanović, Ž., Živković, M. M.,& Grubor, B.. (2012). Dynamical simulation of PV/Wind hybrid energy conversion system. in Energy, 45(1), 324-328.
https://doi.org/10.1016/j.energy.2011.11.063

Bakić V, Pezo ML, Stevanović Ž, Živković MM, Grubor B. Dynamical simulation of PV/Wind hybrid energy conversion system. in Energy. 2012;45(1):324-328.
doi:10.1016/j.energy.2011.11.063 .

Bakić, Vukman, Pezo, Milada L., Stevanović, Žana, Živković, Marija M., Grubor, Borislav, "Dynamical simulation of PV/Wind hybrid energy conversion system" in Energy, 45, no. 1 (2012):324-328,
https://doi.org/10.1016/j.energy.2011.11.063 . .

TY  - THES
AU  - Pezo, Milada L.
PY  - 2011
UR  - http://eteze.bg.ac.rs/application/showtheses?thesesId=535
UR  - https://fedorabg.bg.ac.rs/fedora/get/o:6576/bdef:Content/download
UR  - http://vbs.rs/scripts/cobiss?command=DISPLAY&base=70036&RID=513716899
UR  - http://nardus.mpn.gov.rs/123456789/2308
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7247
AB  - Predmet ovog rada je numerička simulacija i analiza trodimenzionalnog dvofaznog strujanja i istraživanje mehanizama krize ključanja u isparivačkim cevima. Kriza ključanja je nepovoljna pojava. Nagli porast temperature zida cevi izaziva termomehanička naprezanja, koja mogu dovesti do pojave prskotina i pucanja cevi pod pritiskom.Razvijen je matematički model dvofaznog strujanja u isparivačkoj cevi,koji se sastoji od jednačina održanja mase, količine kretanja i energije za obe faze. Sastoji se od sistema parcijalnih diferencijalnih jednačinakoje su rečavane za definisane granične uslove.Bilo je neophodno uvesti i modeliranje i numeričku simulaciju na mikro nivou, jer je bilo potrebno ispitati i proces pojave i rasta mehura, kao i ponašanje dvofazne mešavine na zagrejačkoj površini na makroskopskom nivou.Rezultati numeričkih simulacija su upoređeni sa raspoloživim eksperimentalnim rezultatima.
AB  - The subject of this thesis is numerical simulation and analyses of three dimensional two-phase flow and mechanism of boiling crises in evaporation pipes. Boiling crises is characterized by a dried out heat surface and can bring physical destruction of the heater. A developed mathematical model of two phase flow in evaporation pipe consists of prescribed mass, momentum and energy conservation equations for liquid and vapor two-phase flow. It consists of set of partial differential equations which were solved for specific boundary conditions. Modeling of the micro scale level was necessary to take into account processes of the bubble rise and behavior of the two-phase mixture at the heating surface. Results of the numerical simulation are compared with similar available results of the experiments from the literature.
PB  - Универзитет у Београду, Машински факултет
T2  - Универзитет у Београду
T1  - Numerička simulacija krize ključanja u isparivačkim cevima
T1  - Numerical simulation of boiling crises mechanism in evaporation pipes
UR  - https://hdl.handle.net/21.15107/rcub_nardus_2308
ER  - 

@phdthesis{
author = "Pezo, Milada L.",
year = "2011",
abstract = "Predmet ovog rada je numerička simulacija i analiza trodimenzionalnog dvofaznog strujanja i istraživanje mehanizama krize ključanja u isparivačkim cevima. Kriza ključanja je nepovoljna pojava. Nagli porast temperature zida cevi izaziva termomehanička naprezanja, koja mogu dovesti do pojave prskotina i pucanja cevi pod pritiskom.Razvijen je matematički model dvofaznog strujanja u isparivačkoj cevi,koji se sastoji od jednačina održanja mase, količine kretanja i energije za obe faze. Sastoji se od sistema parcijalnih diferencijalnih jednačinakoje su rečavane za definisane granične uslove.Bilo je neophodno uvesti i modeliranje i numeričku simulaciju na mikro nivou, jer je bilo potrebno ispitati i proces pojave i rasta mehura, kao i ponašanje dvofazne mešavine na zagrejačkoj površini na makroskopskom nivou.Rezultati numeričkih simulacija su upoređeni sa raspoloživim eksperimentalnim rezultatima., The subject of this thesis is numerical simulation and analyses of three dimensional two-phase flow and mechanism of boiling crises in evaporation pipes. Boiling crises is characterized by a dried out heat surface and can bring physical destruction of the heater. A developed mathematical model of two phase flow in evaporation pipe consists of prescribed mass, momentum and energy conservation equations for liquid and vapor two-phase flow. It consists of set of partial differential equations which were solved for specific boundary conditions. Modeling of the micro scale level was necessary to take into account processes of the bubble rise and behavior of the two-phase mixture at the heating surface. Results of the numerical simulation are compared with similar available results of the experiments from the literature.",
publisher = "Универзитет у Београду, Машински факултет",
journal = "Универзитет у Београду",
title = "Numerička simulacija krize ključanja u isparivačkim cevima, Numerical simulation of boiling crises mechanism in evaporation pipes",
url = "https://hdl.handle.net/21.15107/rcub_nardus_2308"
}

Pezo, M. L.. (2011). Numerička simulacija krize ključanja u isparivačkim cevima. in Универзитет у Београду
Универзитет у Београду, Машински факултет..
https://hdl.handle.net/21.15107/rcub_nardus_2308

Pezo ML. Numerička simulacija krize ključanja u isparivačkim cevima. in Универзитет у Београду. 2011;.
https://hdl.handle.net/21.15107/rcub_nardus_2308 .

Pezo, Milada L., "Numerička simulacija krize ključanja u isparivačkim cevima" in Универзитет у Београду (2011),
https://hdl.handle.net/21.15107/rcub_nardus_2308 .