Abstract
A CFD numerical wind tunnel software was made to simulate the air flow and diffusion of pollutants in urban areas. This softeware is very compact. With the collaboration of the modelling tool AutoCAD and the post-processing software Paraview, a set of standardized numerical simulation process of atmospheric diffusion has been established. The model of the software is based on Open Foam open-source platform, which can perform 3D large-scale parallel operation, and solve 3D Navier Stokes equations on Computer cluster. Based on the observation data of iop9 from the 2003 urban joint field study in Oklahoma City, Oklahoma, the numerical wind tunnel is further evaluated. The wind and concentration field in the near and middle regions, as well as the wind speed, wind direction, friction velocity and turbulent kinetic energy (TKE) profiles in the urban wake region are compared between the numerical wind tunnel and the urban 2003 field experiment. The results show that the numerical wind tunnel can be an economic and effective tool to simulate the diffusion of pollutants in urban areas.
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