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《Environmental Science & Technology》 2010-09
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Numerical Simulation of Contaminant Distribution at Urban Traffic Cross

CHEN Yi-sheng,CUI Xiao-chao,PANG Yun-ji (School of Environment and Energy,Inner Mongolia University of Science and Technology,Baotou014010,China)  
k-ε two equation model which describes turbulent movement was used to simulate and calculate the flow field and concentration field distribution in effect of two different kinds of wind direction at the crossroad in a city with road as line pollutants source. In program I,airflow will form obvious vortexes behind the building when airflow circle around a building and pollutants will easily get together. High concentration zone is located where outside between two buildings and up to 2.9440μg/m3. In program II,airflow will not form obvious vortexes because of relation between buildings location and wind direction. Wind speed that is located about buildings rear leeward and between buildings underside is lower,so where is favor to form high concentration zone. High concentration zone is located where underside between two buildings and up to 2.6402μg/m3. The program II is obviously favorable for pervasion of pollutants. When wind into buildings at the direction of slant,the effect of turbulence is decreased and effect of transference is increased,which is favorable to pervasion of pollutants. The exterior windward shape of buildings near patrol will improve the effect of wind to pollutants pervasion and upgrade quality of atmospheric environment around the buildings.
【Fund】: 国家自然科学基金项目资助(50564001)
【CateGory Index】: X830
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1 LIU Changwei1,CHEN Yisheng2,HU Yinzhi2(1.Department of Scientific Research,UIST Baotou,Baotou 014010,China;2.Institute of Metallurgical Engineering,UIST Baotou,Baotou 014010,China);The mathematical model study of polluting fountain diffusion concentration in air pollution[J];Journal of Baotou University of Iron and Steel Technology;2002-04
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