Three dimensional numerical investigations of wind environment around Lanqiying buildings

The three-dimensional wind environment in Lanqiying community of Beijing city, which is complicated due to the dense distribution of the highrise buildings, is investigated by computational fluid dynamics method. The turbulent flow past the buildings is simulated by solving the incompressible Reynolds-averaged Navier-Stokes equations. Both the reverse flow between the buildings and the ecirculation of the wake can be observed. The spectrum analysis of aerodynamics coefficient are successfully obtained and compared with the twodimensional results. The vortex interactions with each other result in different characteristic frequencies and power values, corresponding to  various-scale vortex shedding behind the buildings.