Numerical simulation of goaf gas distribution patterns

In this paper, the CFD software was used to simulate the flow pattern of gas in goaf. We studied the features of movement and distribution of gas in U-shaped ventilation system. The goaf was considered as porous media. Multi-step modelling and transient analysis were adopted in numerical process to simulate the laws of workface process and distribution of gas in goaf. The results show that the return airway and the deep area of goaf are gas accumulated places. Goaf deep part far away from the coalface is the focus to the research work of goaf gas control. Using ground drilling to drainage gas is an effective way to reduce the gas concentration. The numerical results are helpful to the reasonable arrangement of drilling.