Keywords: isolated street canyons, numerical modelling, EWT, environmental wind tunnels, turbulence models, statistical analysis, pollution dispersion, air pollution, air quality, computational fluid dynamics, CFD, urban streets
Numerical simulation and wind tunnel studies of pollution dispersion in an isolated street canyon
A three dimensional numerical modelling study of an urban isolated street canyon are done using Computational Fluid Dynamics (CFD) software FLUENT. The concentration predictions of FLUENT are compared with the Environmental Wind Tunnel (EWT) test results conducted at Indian Institute of Technology, Delhi for the Aspect Ratio (AR) of 1 and 1.5 at perpendicular wind direction. In FLUENT, three different k?Ε turbulence models, i.e., standard, Renormalisation Group (RNG) and realisable, are used. RNG model has been found to be best matched with the wind tunnel results (d = 0.80) for AR = 1, showing that for separated flows, it works best.