城市地区毒气扩散事故数值模拟  

Numerical simulation on poison gas pollutant dispersion in urban area

作　　者：席学军[1] 邓云峰[1] 

机构地区：[1]中国安全生产科学研究院,北京100029

出　　处：《中国安全生产科学技术》2006年第6期35-38,共4页Journal of Safety Science and Technology

基　　金：国家自然科学基金项目(编号:70473018)资助

摘　　要：在城市人口密集区域,一旦发生重大危险气体泄露事故,周围居民将处境危险。由于城市特殊的街道街谷影响,用普通的方法难以精确计算出场的时空分布,大涡模拟(Large Eddy Simu lation)虽然较为精确,但对计算机计算能力要求较高。针对于此,可以通过一些方法,例如贴体网格分析、卫星遥感技术,局部网格加密技术,改进大涡模型的计算条件,考虑泄漏事故一旦发生时,道路、房屋、气候对于气体扩散的影响,对事故的致灾机理从动力学的角度进行研究。在算例中,通过分析城市地区庙会时的一起事故,模拟气体扩散浓度的时空分布,得出城市地区各个地区的不同受灾程度。通过算例我们看到,数值模拟能够为进一步安全规划、灾害预防、应急反应提供决策支持。In the crowded city, once a fatal hazard gas leak accident comes 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 I,ES （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. where in some city area. The conclusion can be drawed through of disaster was obtained everythe example that value simulation can goes a step further with policy-making support about safety planning, disaster prevention, Emergency response.

关 键 词：大涡模拟 贴体网格 局部网格加密 致灾机理 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]