Application of Computational Fluid Dynamics in Atmospheric Environment Simulation: a Case Study in Shenyang, China

摘要

Atmospheric environment simulation in urban space plays an important role in the improvement of urban air problems and the sustainable development of the city. Using Remote Sensing (RS) and the spatial analysis technology in Geographic Information System (GIS), combined with the numerical simulation technology of Computational Fluid Dynamics (CFD) model, this study simulated SO_2, wind and temperature of Shenyang city under the influence of current urban landscape pattern in summer so as to analyze the spatial diffusion of SO_2, wind speed and temperature in different height. The results showed that: 1) The spatial diffusion of SO_2, urban wind speed and temperature had closely related to urban spatial layouts such as the layout of building and urban green space. 2) Urban heat island effect was obvious in the areas with high building density and high population density because the internal wind speed was lower, and SO_2 concentration was not easily spread out. Urban green spaces and water bodies had significant roles in alleviating urban heat island effect and improving air quality. 3) As influenced by wind speed and direction, the spatial spread resistance on SO_2 and temperature was gradually reduced along with height increasing. 4) At present, because of lacking good ventilation corridor coupled with high density of urban construction, urban ventilation and the operating conditions of urban thermal environment are poor, SO_2 pollution is serious in Shenyang city. The diffusion simulation of atmospheric environment factors based on CFD can effectively find the existing problems of urban green space layout in Shenyang city, and provide a new method for the quantitative planning of urban green space optimization pattern.