Wind Field CFD Analysis on the Flat Roof of the Building

Abstract

Wind energy has been rapid development as a kind of renewable energy. Now wind energy is becoming more and more attention in the construction environment, roof mounted wind turbine can not only use the limited land resources in the city, but also make full use of the wind around the building. However, compared with wind field of the flat area, wind field around buildings become more complicated and the wind turbulent intensity becomes stronger due to the structure of the obstacles, which directly affect installation location of the building to install wind turbine. This paper used the Computational Fluid Dynamics (CFD) simulations for the purpose of identifying the different distributions of the wind velocity and turbulence intensity above the actual building roof under different wind directions. And then this paper analyzed suitable heights to install wind turbines at the building roof. Results from the analysis show that the building roof wind velocity can increase by more than 40% after wind flow met the building, but the turbulence intensity become high, which will become lower gradually with the increase of height. Comprehensive wind velocity and turbulence intensity distributions on the building roof, the suitable installation location of wind turbines on the building roof can be choose.