Abstract

In this study, we discuss the flow field of the realistic city block model planned according to the concept of the future city, in the case of an actual typhoon and a winter monsoon hit. This study applied BCM-LES technique, which enables large scale simulation with high efficient of parallel computing. The fluctuating inflow of the actual typhoon was created by using the method of adding the turbulent component based on WRF-LES. From the computed results, we confirmed that properties of inflow and the location of high-rise buildings affect the flow field and the pressure distribution of target high-rise building.

Abstract

In this study, the characteristics and cause of local peak pressure observed on the surface of a super high-rise building with lower parts in an actual urban area are investigated through a relationship with the flow characteristics. A large-eddy simulation (LES) of a high-density area including several super high-rise buildings is carried out using the turbulent inflow boundary condition. It is confirmed that the large peak suction near the windward corner of the target building is induced by the development of strong conical vortex. The rotation of a conical vortex is accelerated by the separated shear layer generated by the windward building and the lower part of the target building when negative peak pressure occurs.