Numerical simulation on the impact of ground floor overhead on wind environment and pollutants diffusion at pedestrian height
The wind field and pollutant concentration field in a regular building group incorporating the ground floor overhead were numerically simulated with realizable k-ε turbulence model.The indicators including mean wind speed ratio MVR,wind speed area ratio ARSiand dimentionless concentration K were adopted for evaluating the wind environment and pollutants concentration at pedestrian height in six cases.The design of ground floor overhead can effectively increase MVR.It is more remarkable in the upstream buildings.The overhead also can reduce ARSiat low wind speed while increase ARSiat medium and high wind speed.When there are two or more columns of overheand in the building group,better improvement of ARSican be achieved.The overhead design has little impact on the K distribution at pedestrian height when the pollution source is on the upstream ground of building group.Due to the strong backflow by overhead,it is difficult for upstream ground pollutants to diffuse in the downstream building group.In the building nearby pollution source,there is a significant decrease of K by the design of overhead at pedestrian height on the windward side.
万方数据
维普
