Mine Gas Flow-diffusion Coupled Model and its Simulation Solution in Goaf

摘要

By introducing an implicit dual-time difference method and the establishment of gas unsteady flow continuity equation and its diffusion equation in mined-out area, the unsteady dynamics gas flowing-diffusion mathematical model in the rear of the working face goaf was derived. According to the determined initial values and boundary conditions of the dynamic model, The numerical solution of above model is presented by matlab PDE toolbox. From the results it can be seen that the application of dual-time method has not only increased the accuracy and computational efficiency of gas unsteady flowing-diffusion model in goaf, but also provides a new thought for controlling gas flow in the coal mine working face goaf.