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Numerical simulation on wind flow in Street canyon with changes of the Aspect Ratio and Wind Direction

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Due to heavy traffic emissions in street canyon, wind flow during the last decade becomes one of the most important topics of air pollution research. In the present work, numerical simulation on wind flow in a street canyon were investigated under changes of the aspect ratio and wind direction. The three-dimensional flow were modeled using a computational fluid dynamics model which were numerically solved using Reynolds-averaged Navier–Stokes equations. The diffusion flow field in the atmospheric boundary layer within the street canyon was studied for different aspect ratios (W/H = ½, ¾, and 1) and wind directions (θ = 90°, 112.5, 135, and 157.5). The numerical simulations were validated against wind-tunnel results to optimize the turbulence model. The numerical results agreed well with the wind-tunnel results. The simulation demonstrated that the wind velocity and turbulence intensity increase as the aspect ratio and wind direction increase.

Author(s):

Mohamed F. Yassin    
Kuwiat University
Kuwait