Effect of the Fence of Urban Residence Communities on the Diffusion of Ground Pollutants

Ground pollutants such as \( {\text{SO}}_{2} \), CO, and other gaseous pollutants generated by the traffic always harm the environment of urban residence communities. Fences or enclosures are common for residence communities in China for security reasons, while they really hinder the wind flow and the pollutant diffusion. In this paper, the computational fluid dynamic (CFD) method has been used to simulate how the fence affects the diffusion of the traffic pollutants around a building. The k-e equation is used to simulate the diffusion of the CO. The results show that (1) the fences hinder the diffusion of the CO on the horizontal direction, but they promote the diffusion in the vertical direction. (2) The higher the fence, the more the CO concentration between the fence and the building. (3) When a ground pollutant source is on the leeward side of a building, it poses the greatest threat to the air quality around the building. It has the least threat when it is set on both sides of the building in wind direction.