A numerical study of reactive pollutant dispersion in street canyons with green roofs

2017 ◽  
Vol 11 (1) ◽  
pp. 125-138 ◽  
Author(s):  
Maryam Moradpour ◽  
Hossein Afshin ◽  
Bijan Farhanieh
Keyword(s):  
Numerical Study ◽  
Pollutant Dispersion ◽  
Green Roofs ◽  
Street Canyons ◽  
Reactive Pollutant

Large-Eddy Simulation of Reactive Pollutant Dispersion Over Street Canyons of Different Aspect Ratios

2014 ◽  
Author(s):  
T. Z. Du ◽  
Chun-Ho Liu ◽  
Y. B. Zhao
Keyword(s):  
Aspect Ratio ◽  
Large Eddy Simulation ◽  
Chemical Reactions ◽  
Pollutant Dispersion ◽  
Pollutant Removal ◽  
Street Canyons ◽  
Eddy Simulation ◽  
Aspect Ratios ◽  
Large Eddy ◽  
Reactive Pollutant

In urban areas, pollutants are emitted from vehicles then disperse from the ground level to the downstream urban canopy layer (UCL) under the effect of the prevailing wind. For a hypothetical urban area in the form of idealized street canyons, the building-height-to-street-width (aspect) ratio (AR) changes the ground roughness which in turn leads to different turbulent airflow features. Turbulence is considered an important factor for the removal of reactive pollutants by means of dispersion/dilution and chemical reactions. Three values of aspect ratio, covering most flow scenarios of urban street canyons, are employed in this study. The pollutant dispersion and reaction are calculated using large-eddy simulation (LES) with chemical reactions. Turbulence timescale and reaction timescale at every single point of the UCL domain are calculated to examine the pollutant removal. The characteristic mechanism of reactive pollutant dispersion over street canyons will be reported in the conference.

Characteristics of flow and reactive pollutant dispersion in urban street canyons

2015 ◽  
Vol 108 ◽  
pp. 20-31 ◽  
Author(s):  
Soo-Jin Park ◽  
Jae-Jin Kim ◽  
Minjoong J. Kim ◽  
Rokjin J. Park ◽  
Hyeong-Bin Cheong
Keyword(s):  
Pollutant Dispersion ◽  
Street Canyons ◽  
Urban Street ◽  
Urban Street Canyons ◽  
Reactive Pollutant

scholarly journals Numerical Study of the Composite Effects of Uneven Street Canyons and Time-varying Inflows on the Air Flows and Pollutant Dispersion

2020 ◽  
Vol 20 (6) ◽  
pp. 1440-1453 ◽  
Author(s):  
Weijun Li ◽  
Yuanping He ◽  
Yunwei Zhang ◽  
Qingxiang Shui ◽  
Xinyi Wu ◽  
...  
Keyword(s):  
Numerical Study ◽  
Pollutant Dispersion ◽  
Time Varying ◽  
Street Canyons ◽  
Air Flows
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