摘要
街道峡谷作为城市污染物扩散研究的典型结构,得到了广泛的重视。前人利用CFD(计算流体力学)研究污染物扩散,大多忽略了区分城市街道峡谷和开放街道峡谷、计算域确定、入流边界等核心问题。在指出前人存在问题的基础上,给出了相应的解决方法。详细论述了污染物在城市街道峡谷和开放街道峡谷内的不同扩散行为,证实了在均匀来流条件下,相对开放街道峡谷,污染物在城市街道峡谷内较难扩散出峡谷的实验发现,模拟结果与M eroney等的实验符合很好。
As a benchmark problem,the pollutant dispersion in a street canyon is much attended and hardly investigated.Some key problems,such as the distinction of open country street canyon and the urban roughness street canyon,the determination of computation domain and the inlet boundary condition,are usually overlooked or even mishandled when the CFD is applied in the simulation of pollutant dispersion.The methods to overcome these shortcomings are presented in this paper.The difference of pollutant dispersion in open country street canyon and urban roughness street canyon is discussed in detail.Numerical results confirm the experimental finding of Meroney et al.(1996) that the pollutant in urban roughness street canyon is harder dispersing out of street canyon than that in open country street canyon for the same condition.Our numerical results are in good agreement with the experiment of Meroney et al.
出处
《城市环境与城市生态》
CAS
CSCD
2008年第3期9-11,共3页
Urban Environment & Urban Ecology
基金
教育部留学归国人员科研启动基金资助
关键词
城市街道峡谷
开放街道峡谷
污染物的扩散
CFD模拟
urban roughness street canyon
open country street canyon
pollutant dispersion
CFD simulation
