Interference mechanism for enhanced wind forces on neighboring tall buildings

Abstract Enhanced forces and motions on a tall square building caused by proximity effects have been investigated using interfering neighboring structures of different size in a low turbulence wind environment. The fluctuating forces on the object building generally increased by the presence of upstream buildings of any size. The increase in the fluctuating forces was mainly caused by 1) shed vortices from the upstream building directly hitting the object building that caused additional angular momentum at the front corners, 2) transition of the shed vortices into smaller scale vortices through a convection process which increased the fluctuating velocity of the incident flow, or 3) the contracted flow between the two buildings that strengthened vortices shedding from the object building.