基于格子Boltzmann方法的地铁站内火灾仿真

摘要

Lattice−Boltzmann method was introduced, and a smoke diffusion theory solved by semi−Lagrangian method was built to show the evolutionary process more truly. Then, this method was implemented by C++. On this basis, a simulation based on a model experiment was conducted. The results show that this method can simulate smoke diffusion process under fire condition in subway station very well, and the key nodes’ temperature evolution has the same tendency with experiment results, and the closer to the fire source, the more the simulation results are in agreement with the experiment results.%引入格子Boltzmann方法，构建以半拉格朗日方法求解的烟流扩散理论，真实重现烟流温度演化过程。采用C++语言，实现该理论方法。在此基础上，建立二维数值模型并仿真；将其与实验数据进行对比。研究结果表明：该方法能较好地重现地铁站内火灾烟流的扩散过程，关键节点的变化趋势与实验结果一致，距离火源越近仿真结果与实验结果吻合程度越高。