同济大学学报（自然科学版）2013，Vol.41Issue(1)：48-52,141,6.DOI:10.3969/j.issn.0253-374x.2013.01.008
城市建筑群环境有毒有害气体扩散数值模拟
Numerical Simulation of Hazardous Gas Dispersion Around Buildings in Urban Environment
摘要
Abstract
A street-level computational fluid dynamics (CFD) model was established to simulate the movement characteristics of the released gas and the concentration distribution around the complex arrangement of buildings. A wind tunnel experiment about release and dispersion in building array was used to validate the model. Then numerical simulations were carried out with two different reference wind speeds, 1. 5 m·s-1 and 3.0 m·s-1, in a genuine urban area. The results show that, given appropriate parameters, the RNG κ—ε closure and SIMPLE algorithm can be employed to predict the dispersion process accurately in obstacle terrain. The time-varying concentration distributions near the ground highlight the influences of wind speed, road and building arrangement, on the dispersion. The sampling concentration around buildings is strongly affected by the positions of sampling points relative to source, including height, distance from the source, angle from wind direction, and so on. The higher wind velocity speeds up plume propagation, as well as concentration dilution process. The results also confirm that, among dense buildings the hazardous gas may stay much longer, which constitutes a threat to public health and safety.关键词
有毒有害气体/扩散/数值模拟/浓度场/街区尺度Key words
hazardous gas/ dispersion/ numerical simulation/ concentration field/ street-level分类
资源环境引用本文复制引用
郑茂辉,金敏,许建明..城市建筑群环境有毒有害气体扩散数值模拟[J].同济大学学报（自然科学版）,2013,41(1):48-52,141,6.基金项目
国家自然科学基金(41001217) （41001217）
"十二五"国家科技支撑计划(2012BAJ11B01) （2012BAJ11B01）
中央高校基本科研业务费专项资金 （）
