Numerical study of flow structure and pedestrian-level wind comfort inside urban street canyons

In this work we numerically investigate the flow conditions inside uniform and non-uniform street canyons well within atmospheric boundary layer. The numerical simulations use steady RANS method with near-wall modelling approach to simulate wall roughness at boundary. With aim of investigating both structure in broad terms, pedestrian comfort canyon between parallel buildings, test different configurations varied width, building width height. Turbulent are broadly expected hold physically-realistic range Reynolds number order $10^6$ considered here, where take height be a characteristic length scale, free stream velocity as velocity. addition discussing features wake flow, effects geometry on by using Extended Land Beaufort Scale for purpose. We present compare maps each our geometries.