Large Eddy Simulation of Unstably Stratified Turbulent Flow over Urban-Like Building Arrays
Thermal instability induced by solar radiation is the most common condition of urban atmosphere in daytime. Compared to researches under neutral conditions, only a few numerical works studied the unstable urban boundary layer and the effect of buoyancy force is unclear. In this paper, unstably strat...
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2013-01-01
|
| Series: | Journal of Applied Mathematics |
| Online Access: | http://dx.doi.org/10.1155/2013/783187 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832552592866017280 |
|---|---|
| author | Bobin Wang Guixiang Cui |
| author_facet | Bobin Wang Guixiang Cui |
| author_sort | Bobin Wang |
| collection | DOAJ |
| description | Thermal instability induced by solar radiation is the most common condition of urban atmosphere in daytime. Compared to researches under neutral conditions, only a few numerical works studied the unstable urban boundary layer and the effect of buoyancy force is unclear. In this paper, unstably stratified turbulent boundary layer flow over three-dimensional urban-like building arrays with ground heating is simulated. Large eddy simulation is applied to capture main turbulence structures and the effect of buoyancy force on turbulence can be investigated. Lagrangian dynamic subgrid scale model is used for complex flow together with a wall function, taking into account the large pressure gradient near buildings. The numerical model and method are verified with the results measured in wind tunnel experiment. The simulated results satisfy well with the experiment in mean velocity and temperature, as well as turbulent intensities. Mean flow structure inside canopy layer varies with thermal instability, while no large secondary vortex is observed. Turbulent intensities are enhanced, as buoyancy force contributes to the production of turbulent kinetic energy. |
| format | Article |
| id | doaj-art-c5db5ef17790458aba0ae1d7efa69b96 |
| institution | Kabale University |
| issn | 1110-757X 1687-0042 |
| language | English |
| publishDate | 2013-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Applied Mathematics |
| spelling | doaj-art-c5db5ef17790458aba0ae1d7efa69b962025-02-03T05:58:20ZengWileyJournal of Applied Mathematics1110-757X1687-00422013-01-01201310.1155/2013/783187783187Large Eddy Simulation of Unstably Stratified Turbulent Flow over Urban-Like Building ArraysBobin Wang0Guixiang Cui1Department of Mechanical Engineering, Tsinghua University, Beijing, ChinaDepartment of Mechanical Engineering, Tsinghua University, Beijing, ChinaThermal instability induced by solar radiation is the most common condition of urban atmosphere in daytime. Compared to researches under neutral conditions, only a few numerical works studied the unstable urban boundary layer and the effect of buoyancy force is unclear. In this paper, unstably stratified turbulent boundary layer flow over three-dimensional urban-like building arrays with ground heating is simulated. Large eddy simulation is applied to capture main turbulence structures and the effect of buoyancy force on turbulence can be investigated. Lagrangian dynamic subgrid scale model is used for complex flow together with a wall function, taking into account the large pressure gradient near buildings. The numerical model and method are verified with the results measured in wind tunnel experiment. The simulated results satisfy well with the experiment in mean velocity and temperature, as well as turbulent intensities. Mean flow structure inside canopy layer varies with thermal instability, while no large secondary vortex is observed. Turbulent intensities are enhanced, as buoyancy force contributes to the production of turbulent kinetic energy.http://dx.doi.org/10.1155/2013/783187 |
| spellingShingle | Bobin Wang Guixiang Cui Large Eddy Simulation of Unstably Stratified Turbulent Flow over Urban-Like Building Arrays Journal of Applied Mathematics |
| title | Large Eddy Simulation of Unstably Stratified Turbulent Flow over Urban-Like Building Arrays |
| title_full | Large Eddy Simulation of Unstably Stratified Turbulent Flow over Urban-Like Building Arrays |
| title_fullStr | Large Eddy Simulation of Unstably Stratified Turbulent Flow over Urban-Like Building Arrays |
| title_full_unstemmed | Large Eddy Simulation of Unstably Stratified Turbulent Flow over Urban-Like Building Arrays |
| title_short | Large Eddy Simulation of Unstably Stratified Turbulent Flow over Urban-Like Building Arrays |
| title_sort | large eddy simulation of unstably stratified turbulent flow over urban like building arrays |
| url | http://dx.doi.org/10.1155/2013/783187 |
| work_keys_str_mv | AT bobinwang largeeddysimulationofunstablystratifiedturbulentflowoverurbanlikebuildingarrays AT guixiangcui largeeddysimulationofunstablystratifiedturbulentflowoverurbanlikebuildingarrays |