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《Journal of Safety Science and Technology》 2006-06
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Numerical simulation on poison gas pollutant dispersion in urban area

XI Xue-jun, DENG Yun-feng (China Academy of Safety Science and Technology, Beijing 100029, China)  
In the crowded city, once a fatal hazard gas leak accident conies on, the periphery inhabitant will face with danger. As we know, it is difficult to exactly count space and time distribution of field with the ordinary method, as a result of the city' s special street canyous structure influence。Although LES (Large Eddy Simulation) is precise, it request high to the computer computation ability. In this article, we attempt to use some methods to improve-LES computation technology such as body-fitted grid analysis, satellite remote sensing technology, 3D automated adaptive refinement of all element meshes. It is considered that how path, house, climate influence gas diffusion when leak accident occurs. The mechanism of disaster occurrence is studied by dynamics. In the example, the space and time gas distribution of field was processed by simulating a accident in Temple Fair of some city area. And different degrees of disaster was obtained everywhere in some city area. The conclusion can be drawed through the example that value simulation can goes a step further with policy-making support about safety planning, disaster prevention, Emergency response.
【Fund】: 国家自然科学基金项目(编号:70473018)资助
【CateGory Index】: X507
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