Pedestrian level wind flow field of elevated tall buildings with dense tandem arrangement

Elevation of residence is widely used in tropical regions such as southeast Asia, which provides excellent ventilation and moisture resistance. However, current research on elevated buildings are mainly immersed in low-rise buildings in the tropics. Few studies have been done on the wind flow mechanism of elevated tall buildings, which is crucial to living comfort in rapidly developing urban agglomerations. Under these circumstances, it is of great significance to study the impact of elevation on the wind environment of dense tall buildings. In this study, the effects of elevation on 4 types of building arrangements and 6 different aspect ratios (AR) of tall buildings are systematically investigated through particle image velocimetry (PIV). The results show that the elevation can not only significantly enhance the pedestrian wind environment around the buildings under a specific spacing between buildings, but also reduce the drag exerted on the building to a certain extent. Therefore, a proper setup of elevation on tall buildings can improve the pedestrian wind environment and mitigate wind disasters.