The Influence of Mesh Generation on the Results of Flow Solving in Working Face and Gob

The distribution of air leakage between working face and gob area and migration of gob gas are simulated by using commercial CFD software Fluent. Mesh generation is one of the most important factors influencing the calculation accuracy of airflow field in gob area. If a coarse grid is used to simulate, the accurate results cannot be obtained. However, using a finer grid need to spend much more time. In this paper, near-wall boundary layer mesh and various grid spacing of working face and gob are constructed with Gambit and respectively with Fluent simulation near-wall boundary layer encryption and the airflow field and migration of gob gas with different grid spacing in working face and gob. Compared with the original models: the eddy zone range of the upper corner and down corner and the highest gas accumulation concentration of the upper corner can be simulated accurately, which use boundary layer encryption and reasonable grid spacing .This results have important significance to deal with gas accumulation in the upper corner of working face and choose the reasonable gas drainage in gob.