Numerical study on flow field and pollutant dispersion in an ideal street canyon within a real tree model at different wind velocities

2021 ◽  
Vol 81 ◽  
pp. 679-692 ◽  
Author(s):  
Le Wang ◽  
Junwei Su ◽  
Zhaolin Gu ◽  
Liyu Tang
Keyword(s):  
Flow Field ◽  
Street Canyon ◽  
Numerical Study ◽  
Pollutant Dispersion ◽  
Tree Model ◽  
Real Tree ◽  
Wind Velocities

A Numerical Study of the Flow and Pollutant Dispersion in Valley-River Urban

2013 ◽  
Vol 645 ◽  
pp. 208-216
Author(s):  
Rong Huang ◽  
Naiang Wang
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Flow Field ◽  
Numerical Study ◽  
Concentration Field ◽  
Pollutant Dispersion ◽  
Northwest China ◽  
Navier Stokes ◽  
The Impact ◽  
Valley City

Air flow and pollutant dispersion characteristics in a real valley city are studied under the real boundary condition. The 3D computational fluid dynamics using Reynolds-averaged Navier-Stokes modeling was carried out in Lanzhou which is a typical valley city in Northwest, China. The standard κ­-ε turbulence model as a simplified computational fluid dynamics model is used to provide moderately fast simulations of turbulent airflow in an urban environment. The modeled flow field indicated that the geometry, wind direction and source location had a significant effects on the flow field. The flow shows the funnelling is rather obvious when the wind flow through the narrow area in the middle of the city. It is obvious that in the high-altitude region, due to the impact of high and low differential pressure and terrain, SO2 and NO2 formed two cyclic concentration field in the dispersion process.

LES simulation of flow field and pollutant dispersion in a street canyon under time-varying inflows with TimeVarying-SIMPLE approach

2019 ◽  
Vol 157 ◽  
pp. 185-196 ◽  
Author(s):  
Weijun Li ◽  
Yuanping He ◽  
Yunwei Zhang ◽  
Junwei Su ◽  
Chungang Chen ◽  
...  
Keyword(s):  
Flow Field ◽  
Street Canyon ◽  
Pollutant Dispersion ◽  
Simple Approach ◽  
Time Varying

Effects of real trees and their structure on pollutant dispersion and flow field in an idealized street canyon

2019 ◽  
Vol 10 (6) ◽  
pp. 1699-1710 ◽  
Author(s):  
Junwei Su ◽  
Le Wang ◽  
Zhaolin Gu ◽  
Meimei Song ◽  
Zhourong Cao
Keyword(s):  
Flow Field ◽  
Street Canyon ◽  
Pollutant Dispersion
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