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中文摘要：
将计算机数值模拟技术应用于火灾调查，采用大涡模拟方法再现国内某大厦特大火灾坍塌事故的火灾发展过程，完善火灾调查结论．根据现场勘查结果设置边界条件，分别对两个可能的起火点建立场景模型进行模拟．将计算得出的关键部位单位距离不可见度、温度及热通量发展趋势等数据与火灾现场勘测结果进行比较，排除了不合理的起火点，验证了另一种情况的正确性，解决了火灾现场勘测无法确定的难题，完善了火灾调查结论．根据计算再现的火灾蔓延过程，寻找延缓火势蔓延和降低火灾损失的方法．
英文摘要：
Results of a numerical large eddy simulation （ LES）, which was performed to provide insight on a fire, were described. This fire reconstruction was motivated from the information of a fire which caused a building collapse. According to the actual building geometry, material thermal properties, two possible fire sources in different model scenarios were set. Comparing simulation results of spread trends of obscuration, fire and heat flow with knowledge of fire site investigation, possibility of one fire source can be eliminated while the other is proved. It also indicates that numerical simulation methods can help investigators get more detail and solve the problem that the reconnaissance of the spot can＇t be ascertained on numerical investigation, methods to retard fire spread and reduce damage of fire are found.
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