Abstract
Pollution dispersion mechanism in an urban street canyon has been studied using numerical simulations. Street canyon of aspect ratio “one” with perpendicular wind flow direction and pollutant line source has been modelled using ANSYS FLUENT 16.2 software code. RNG, k-ε turbulence model and species transport model were applied in this numerical study. Pollutant mass fractions at various locations of street canyon have been studied and discussed. The numerical results show significant variations of pollutant due to existence of unsteady vortex in street canyon. Pollutant concentrations were observed higher on leeward side compared to windward side. Slow mixing rate of pollutant with fresh air leads to higher pollutant accumulation in street canyon. It has been observed that pollutant concentrations were higher at pedestrian level and decreased along the height of the street canyon.
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