Abstract
Abstract The flow and pollutant dispersion in urban street canyons are investigated using a two-dimensional numerical model with the k–e turbulent closure scheme. It is shown that the flow field is characterized mainly by the number and intensity of vortices produced in the street canyon. As the street aspect ratio (ratio of the building height to the width between buildings) increases, the number of vortices increases. In the upper-canyon region, the downward motion near the downwind building is stronger than the upward motion near the upwind building, and the turbulent kinetic energy (TKE) is higher near the downwind building than near the upwind building because of stronger wind shears near the downwind building. The TKE budget analysis shows that the shear production is high near the interface between the ambient flow and the street canyon flow and that the turbulent dissipation is also high where the shear production is high. The horizontal advection and diffusion are found to play a crucial role in ...
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