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  - Lazović, Ivan
AU  - Stevanović, Žarko M.
AU  - Jovašević-Stojanović, Milena
AU  - Živković, Marija M.
AU  - Banjac, Miloš J.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1152
AB  - Previous studies have shown that poorly ventilated classrooms can have negative impact on the health of children and school staff. In most cases, schools in Serbia are ventilated naturally. Considering their high occupancy, classroom air quality test determines the level of air pollution, after which it is possible to implement corrective measures. The research presented in this study, was conducted in four schools which are located in different areas and have different architecture designs. Measurements in these schools have been performed during the winter (heating season) and spring (non-heating season) and the following results were presented: indoor air temperature, relative humidity, and carbon dioxide concentration. These results show that the classroom average concentration of carbon dioxide often exceeds the value of 1500 ppm, during its full occupancy, which indicates inadequate ventilation. Measurement campaigns show that carbon dioxide concentration increased significantly from non-heating to heating season in three of the four schools. Analysis of measurements also determined high correlation between relative humidity and carbon dioxide concentration in all schools in winter season. This fact may constitute a solid basis for the fresh air supply strategy.
T2  - Thermal Science
T1  - Impact of Co2 Concentration on Indoor Air Quality and Correlation with Relative Humidity and Indoor Air Temperature in School Buildings in Serbia
VL  - 20
SP  - S297
EP  - S307
DO  - 10.2298/TSCI150831173L
ER  - 

@article{
author = "Lazović, Ivan and Stevanović, Žarko M. and Jovašević-Stojanović, Milena and Živković, Marija M. and Banjac, Miloš J.",
year = "2016",
abstract = "Previous studies have shown that poorly ventilated classrooms can have negative impact on the health of children and school staff. In most cases, schools in Serbia are ventilated naturally. Considering their high occupancy, classroom air quality test determines the level of air pollution, after which it is possible to implement corrective measures. The research presented in this study, was conducted in four schools which are located in different areas and have different architecture designs. Measurements in these schools have been performed during the winter (heating season) and spring (non-heating season) and the following results were presented: indoor air temperature, relative humidity, and carbon dioxide concentration. These results show that the classroom average concentration of carbon dioxide often exceeds the value of 1500 ppm, during its full occupancy, which indicates inadequate ventilation. Measurement campaigns show that carbon dioxide concentration increased significantly from non-heating to heating season in three of the four schools. Analysis of measurements also determined high correlation between relative humidity and carbon dioxide concentration in all schools in winter season. This fact may constitute a solid basis for the fresh air supply strategy.",
journal = "Thermal Science",
title = "Impact of Co2 Concentration on Indoor Air Quality and Correlation with Relative Humidity and Indoor Air Temperature in School Buildings in Serbia",
volume = "20",
pages = "S297-S307",
doi = "10.2298/TSCI150831173L"
}

Lazović, I., Stevanović, Ž. M., Jovašević-Stojanović, M., Živković, M. M.,& Banjac, M. J.. (2016). Impact of Co2 Concentration on Indoor Air Quality and Correlation with Relative Humidity and Indoor Air Temperature in School Buildings in Serbia. in Thermal Science, 20, S297-S307.
https://doi.org/10.2298/TSCI150831173L

Lazović I, Stevanović ŽM, Jovašević-Stojanović M, Živković MM, Banjac MJ. Impact of Co2 Concentration on Indoor Air Quality and Correlation with Relative Humidity and Indoor Air Temperature in School Buildings in Serbia. in Thermal Science. 2016;20:S297-S307.
doi:10.2298/TSCI150831173L .

Lazović, Ivan, Stevanović, Žarko M., Jovašević-Stojanović, Milena, Živković, Marija M., Banjac, Miloš J., "Impact of Co2 Concentration on Indoor Air Quality and Correlation with Relative Humidity and Indoor Air Temperature in School Buildings in Serbia" in Thermal Science, 20 (2016):S297-S307,
https://doi.org/10.2298/TSCI150831173L . .

TY  - JOUR
AU  - Stefanović, Sandra
AU  - Stevanović, Žarko M.
AU  - Grubor, Borislav
AU  - Stevanović, Žana
AU  - Živković, Marija M.
AU  - Djurovic-Petrovic, Maja D.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7035
AB  - Paper presents comparative analysis of residential indoor air pollutant concentration change over future specified time horizon, implementing building physical and thermal retrofit measures, thus creating pollution mitigation scenarios for existing Belgrade and Nis housing stock followed by greenhouse gas emission reduction scenarios up to 2050. Regarding specified mitigation scenarios, the set of typical housing unit models has been generated which define existing housing stock of Belgrade and Nis. Extensive monitoring of physical and thermal parameters as well as detailed socio-technical survey of selected households was performed and used as an initial modeling input. Relationship between environment pollution and building performances was investigated, with respect to indoor-outdoor sources of pollution, thermal and physical properties of the stock samples and occupants behavior. As a final output, indoor pollutant concentrations for each of the modelled cases was obtained and validated against the available data. This housing modelling framework has been created in order to develop an assessment of present and future exposure and health impact quantity regarding single/multiple scenario interventions introduced to the housing stock. This paper provides each strategy guidelines for taking measures towards achieving the healthier indoor environments.
T2  - Thermal Science
T1  - Comparative Analyses of Built Environment Exposures Relevant to Health of Greenhouse Gas Emissions Reduction Strategies in Serbia
VL  - 18
IS  - 3
SP  - 903
EP  - 914
DO  - 10.2298/TSCI1403903S
ER  - 

@article{
author = "Stefanović, Sandra and Stevanović, Žarko M. and Grubor, Borislav and Stevanović, Žana and Živković, Marija M. and Djurovic-Petrovic, Maja D.",
year = "2014",
abstract = "Paper presents comparative analysis of residential indoor air pollutant concentration change over future specified time horizon, implementing building physical and thermal retrofit measures, thus creating pollution mitigation scenarios for existing Belgrade and Nis housing stock followed by greenhouse gas emission reduction scenarios up to 2050. Regarding specified mitigation scenarios, the set of typical housing unit models has been generated which define existing housing stock of Belgrade and Nis. Extensive monitoring of physical and thermal parameters as well as detailed socio-technical survey of selected households was performed and used as an initial modeling input. Relationship between environment pollution and building performances was investigated, with respect to indoor-outdoor sources of pollution, thermal and physical properties of the stock samples and occupants behavior. As a final output, indoor pollutant concentrations for each of the modelled cases was obtained and validated against the available data. This housing modelling framework has been created in order to develop an assessment of present and future exposure and health impact quantity regarding single/multiple scenario interventions introduced to the housing stock. This paper provides each strategy guidelines for taking measures towards achieving the healthier indoor environments.",
journal = "Thermal Science",
title = "Comparative Analyses of Built Environment Exposures Relevant to Health of Greenhouse Gas Emissions Reduction Strategies in Serbia",
volume = "18",
number = "3",
pages = "903-914",
doi = "10.2298/TSCI1403903S"
}

Stefanović, S., Stevanović, Ž. M., Grubor, B., Stevanović, Ž., Živković, M. M.,& Djurovic-Petrovic, M. D.. (2014). Comparative Analyses of Built Environment Exposures Relevant to Health of Greenhouse Gas Emissions Reduction Strategies in Serbia. in Thermal Science, 18(3), 903-914.
https://doi.org/10.2298/TSCI1403903S

Stefanović S, Stevanović ŽM, Grubor B, Stevanović Ž, Živković MM, Djurovic-Petrovic MD. Comparative Analyses of Built Environment Exposures Relevant to Health of Greenhouse Gas Emissions Reduction Strategies in Serbia. in Thermal Science. 2014;18(3):903-914.
doi:10.2298/TSCI1403903S .

Stefanović, Sandra, Stevanović, Žarko M., Grubor, Borislav, Stevanović, Žana, Živković, Marija M., Djurovic-Petrovic, Maja D., "Comparative Analyses of Built Environment Exposures Relevant to Health of Greenhouse Gas Emissions Reduction Strategies in Serbia" in Thermal Science, 18, no. 3 (2014):903-914,
https://doi.org/10.2298/TSCI1403903S . .

TY  - JOUR
AU  - Stevanović, Žarko M.
AU  - Mirkov, Nikola S.
AU  - Stevanović, Žana
AU  - Stojanović, Andrijana D.
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3986
AB  - Modeling atmosperic boundary layer with standard linear models does not sufficiently reproduce wind conditions in complex terrain, especially on leeward sides of terrain slopes More complex models. based on Reynolds averaged Navier-Stokes equations and two-equation kappa-epsilon turbulence models for neutral conditions in atmospheric boundary written in general curvilinear non-orthogonal co-ordinate system, have been evaluated In order to quantify the differences and level of accuracy of different turbulence models, investigation has been performed using standard kappa-epsilon model without additional production terms and kappa-epsilon turbulence models with modified set of model coefficients The sets of full conservation equations are numerically solved by computational fluid dynamics technique. Numerical calculations of turbulence models are compared to the reference experimental data of Askervein hill measurements
T2  - Thermal Science
T1  - Validation of Atmospheric Boundary Layer Turbulence Model By On-Site Measurements
VL  - 14
IS  - 1
SP  - 199
EP  - 207
DO  - 10.2298/TSCI1001199S
ER  - 

@article{
author = "Stevanović, Žarko M. and Mirkov, Nikola S. and Stevanović, Žana and Stojanović, Andrijana D.",
year = "2010",
abstract = "Modeling atmosperic boundary layer with standard linear models does not sufficiently reproduce wind conditions in complex terrain, especially on leeward sides of terrain slopes More complex models. based on Reynolds averaged Navier-Stokes equations and two-equation kappa-epsilon turbulence models for neutral conditions in atmospheric boundary written in general curvilinear non-orthogonal co-ordinate system, have been evaluated In order to quantify the differences and level of accuracy of different turbulence models, investigation has been performed using standard kappa-epsilon model without additional production terms and kappa-epsilon turbulence models with modified set of model coefficients The sets of full conservation equations are numerically solved by computational fluid dynamics technique. Numerical calculations of turbulence models are compared to the reference experimental data of Askervein hill measurements",
journal = "Thermal Science",
title = "Validation of Atmospheric Boundary Layer Turbulence Model By On-Site Measurements",
volume = "14",
number = "1",
pages = "199-207",
doi = "10.2298/TSCI1001199S"
}

Stevanović, Ž. M., Mirkov, N. S., Stevanović, Ž.,& Stojanović, A. D.. (2010). Validation of Atmospheric Boundary Layer Turbulence Model By On-Site Measurements. in Thermal Science, 14(1), 199-207.
https://doi.org/10.2298/TSCI1001199S

Stevanović ŽM, Mirkov NS, Stevanović Ž, Stojanović AD. Validation of Atmospheric Boundary Layer Turbulence Model By On-Site Measurements. in Thermal Science. 2010;14(1):199-207.
doi:10.2298/TSCI1001199S .

Stevanović, Žarko M., Mirkov, Nikola S., Stevanović, Žana, Stojanović, Andrijana D., "Validation of Atmospheric Boundary Layer Turbulence Model By On-Site Measurements" in Thermal Science, 14, no. 1 (2010):199-207,
https://doi.org/10.2298/TSCI1001199S . .