publication . Article . 2011

Flow and Pollutant Transport in Urban Street Canyons of Different Aspect Ratios with Ground Heating: Large-Eddy Simulation

Xian-Xiang Li; Rex E. Britter; Leslie K. Norford; Tieh-Yong Koh; Dara Entekhabi;
Open Access English
  • Published: 16 Nov 2011
  • Publisher: Springer Netherlands
  • Country: United States
Abstract
A validated large-eddy simulation model was employed to study the effect of the aspect ratio and ground heating on the flow and pollutant dispersion in urban street canyons. Three ground-heating intensities (neutral, weak and strong) were imposed in street canyons of aspect ratio 1, 2, and 0.5. The detailed patterns of flow, turbulence, temperature and pollutant transport were analyzed and compared. Significant changes of flow and scalar patterns were caused by ground heating in the street canyon of aspect ratio 2 and 0.5, while only the street canyon of aspect ratio 0.5 showed a change in flow regime (from wake interference flow to skimming flow). The street ca...
Subjects
free text keywords: Atmospheric Science, Turbulence, Meteorology, Dispersion (optics), Scalar (physics), Canyon, geography.geographical_feature_category, geography, Pollutant, Atmospheric sciences, Aspect ratio (image), Large eddy simulation, Flow (psychology), Physics
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