Numerical studies of passive and reactive pollutant dispersion in high-density urban models with various building densities and height variations

2020 ◽  
Vol 177 ◽  
pp. 106916
Author(s):  
Yong Zhang ◽  
Cuiyun Ou ◽  
Lan Chen ◽  
Luolin Wu ◽  
Jiarui Liu ◽  
...  
Keyword(s):  
Pollutant Dispersion ◽  
High Density ◽  
Numerical Studies ◽  
Urban Models ◽  
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.

Multilayer urban canopy modelling and mapping for traffic pollutant dispersion at high density urban areas

2019 ◽  
Vol 647 ◽  
pp. 255-267 ◽  
Author(s):  
Chao Yuan ◽  
Ruiqin Shan ◽  
Yangyang Zhang ◽  
Xian-Xiang Li ◽  
Tiangang Yin ◽  
...  
Keyword(s):  
Urban Areas ◽  
Urban Canopy ◽  
Pollutant Dispersion ◽  
High Density

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
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