采煤工作面瓦斯流动模型及COMSOL数值解算

引入溶质扩散平移方程和Fick扩散定理来模拟瓦斯的流动扩散行为,应用N-S方程和Brinkman方程构建工作面和采空区气体流动模型，并将两个模型有机地联系在一个统一的流动场中，基于质量守恒和压力平衡，建立出采煤工作面瓦斯流动的物理模型。进风巷道、回风巷道、工作面以及采空区瓦斯涌出和扩散被有效地联系在了一起,应用COMSOL Multiphysics多物理耦合分析工具求解该物理模型。模型计算结果表明：该模型能够模拟工作面和采空区瓦斯浓度分布，并能对瓦斯专排巷的位置布置、工作面通风方式优劣进行对比判断，对于采煤工作面有一定的适用性。

Gas flowing model of mining face and solve it using COMSOL

This article simulated gas flowing diffusion behavior from leading in solute diffusion translation equation and Fick’s law,using Navier-Stokes equations and Brinkman equations to construct the gas flowing model of the mining face and the goaf,and related two models organically in a unified flow field,and established numerical model of gas flowing in the coal mining face based on mass conservation and pressure balance.It can be better getting together that gas emission from intake roadway,ventilation roadway,working face,the goaf and gas diffusion from the mining face.Then the author solved the physical model using the COMSOL Multiphysics system numerical analysis tool,and simulated the gas flow process of the mining face.The model calculated results show that this model can simulate the gas concentration distribution which comes from the mining face and the goaf,and contrasts judgment the position of the special gas drainage roadway and the advantages and disadvantages of ventilation mode,it also has determinate application for mining face.