Advances in Atmospheric Sciences

, Volume 22, Issue 2, pp 290–299 | Cite as

Numerical studies on flow fields around buildings in an Urban street canyon and cross-road

  • Cheng Xueling
  • Hu Fei


The questions on how vortices are constructed and on the relationship between the flow patterns and concentration distributions in real street canyons are the most pressing questions in pollution control studies. In this paper, the very large eddy simulation (VLES) and large eddy simulation (LES) are applied to calculate the flow and pollutant concentration fields in an urban street canyon and a cross-road respectively. It is found that the flow separations are not only related to the canyon aspect ratios, but also with the flow velocities and wall temperatures. And the turbulent dispersions are so strongly affected by the flow fields that the pollutant concentration distributions can be distinguished from the different aspect ratios, flow velocities and wall temperatures.

Key words

street canyon separating flow turbulence dispersion numerical simulation 


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© Advances in Atmospheric Sciences 2003

Authors and Affiliations

  1. 1.State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing

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