巷道热流蔓延及阻滞的分块耦合LBM仿真

A Block Coupling LBM Simulation of Heat Flow Spreading and Hindering in Underground Tunnels

为了掌握地下矿火灾发生后遇到易燃物蔓延、障碍物阻滞的规律,提出用分块耦合格子Boltzmann方法(LBM)进行巷道热流蔓延与阻滞的仿真方法.该方法使用分块耦合算法将巷道分为若干相对规则的块,并应用速度-温度双分布LBM对巷道热流蔓延及阻滞过程进行仿真.仿真时,在巷道随机设置多处易燃物,当热流流经巷道时采用热流蔓延模型使得易燃物在一定条件下被引燃,产生热流与原有热流共同传播;在巷道随机设置障碍物,采用热流阻滞模型分析热流遇到障碍物后其方向和温度变化状况.仿真结果表明,该仿真方法可得到关于热流流动速度、热流温度和压力的详细数据,获得关于巷道热流流态的直观信息,从而为制定有效的规避热流的方案提供依据.

In order to master laws of fire spreading when meeting combustibles and hindering when meeting obstacles during a fire disaster in underground tunnels, an approach for simulating heat flow spreading and hindering in tunnels based on the block coupling lattice Boltzmann method （LBM） is put forward. This method divides the space of tunnels into relative regular blocks and the double distributed velocity-temperature LBM is adopted to simulate heat flow spreading and hindering. During simulation, combustibles are randomly scattered along tunnels and burn under certain conditions, the new generated heat flow then propagates together with old heat flow obstacles are randomly set up along tunnels, and a heat flow hindering model is applied to study the direction and temperature change of heat flow when it encounters obstacles. The simulating result shows that a great deal of information about velocity, temperature and pressure of heat flow can be obtained and visual information about heat flow along tunnels can also be obtained, which provide a scientific basis to escape effectively from heat flow.