基于大涡模拟和线性规划的火灾重构方法研究

Fire Reconstruction Method Based on LES and Linear Programming

提出了基于大涡模拟和线性规划法的火灾事故重构方法。该方法运用大涡模拟对火灾事故进行数值模拟,在模拟中把所有变量划分为大尺度量和小尺度量,对大尺度量进行直接模拟而对小尺度量采用亚格子模型进行模拟,有效提高模拟的精度;同时运用线性规划法将参数关系局部线性化来求解优化问题,提高了模拟的效率。将该方法应用于上海市某农贸批发市场火灾事故的数值重构,并进行火势与烟气的模拟分析。模拟结果与现场勘测结果较为吻合,验证了该方法的可行性。

A method based on LES and linear programming was proposed for the numerical construction of fire accident. In the simulation with LES method, all the quantities were decomposed into large-scale components and small-scale components. For large-scale components, the direct simulation method was used. For small-scale components, the subgrid model was used. The LES method could improve the simulation accuracy. In the linear programming method, the parameters were locally linearized to solve the optimization problem. It could improve the simulation efficiency. The method was applied to the numerical reconstruction of a wholesale market fire in Shanghai. The spread of fire and smoke was analyzed. The simulation results agree well with the fire reconnaissance data, which validates the proposed method.