Underground coal mining frequently uses longwalls. The occurrence of a potentially explosive mixture of methane and air is one of the most serious hazards. A large number of papers have applied numerical modeling of methane propagation in research aimed at this problem. To date, none of the CFD simulations has considered the movement of the shearer in the analyses. This paper proposes an adaptation of a method used for the description of the movement of trains in tunnels to a specific geometry of a longwall district. The flow of the air-methane mixture was calculated using the finite volume method, in particular the k-w SST and SAS turbulence models. Due to the movement of the shearer, moving and deforming meshes were used for simulation of unsteady flows. Examples of solutions for two hypothetical cases are presented. Finally, the drawbacks and advantages of presented methods are discussed. Further development with the application of either local mesh variability or overset meshes is outlined.

地下煤矿开采经常使用长壁。甲烷和空气的潜在爆炸性混合物的出现是最严重的危害之一。针对此问题，大量论文已将甲烷扩散的数值模型应用于研究。迄今为止，没有任何CFD模拟在分析中考虑过采煤机的运动。本文提出了一种用于描述隧道中火车运动的方法，以适应长壁区域的特定几何形状。使用有限体积法（特别是k - w）计算空气-甲烷混合物的流量SST和SAS湍流模型。由于采煤机的运动，使用了移动和变形的网格来模拟非定常流动。给出了两个假设案例的解决方案示例。最后，讨论了所提出方法的缺点和优点。概述了使用局部网格可变性或覆盖网格的进一步发展。