Influence of the Configuration of Consecutive Street Canyons and Atmospheric Stability

This research, based on Computational Fluid Dynamics (CFD) analysis, focuses on the wind characteristics and the ventilation performance in the consecutive street canyons produced by various building complex configurations. In this research, the buildings in the street canyon space were distributed in either staggered or normal arrangements and, in consideration of the varying distribution and height of different buildings, high-rise buildings, middle-rise buildings and low-rise buildings were all included. The air flow field and concentration distribution change were compared at various degrees of atmospheric stability. In order to examine the ventilation efficiency and purging flow rate (PFR), 3 different atmospheric conditions were analyzed - a stable case, a weak-unstable case and an unstable case. Based on the analysis results, it was found that in isothermal cases the best pedestrian effect and ventilation efficiency were achieved when buildings with different heights were laid out in a normal arrangement. In non-isothermal cases, the highest ventilation efficiency was found in unstable conditions.