Prediction method for simulating micro-leakage methane migration in porous medium by CFD (computational fluid dynamics)

The invention provides a method for predicting micro-leakage methane migration in a porous medium through CFD simulation. The method comprises the following steps: carrying out grid division on a geometric model established by SpaceClaim software, and importing the geometric model into CFD (Computational Fluid Dynamics) software; constructing a control equation, a laminar flow model, a component conveying model, a diffusion coefficient model and a porous medium model; fluid attributes, model operation conditions, initial conditions, a discrete mode and a solving algorithm are set, and the prediction model for micro-leakage methane migration in the porous medium is constructed. According to the method, Fick diffusion, Knudsen diffusion and transition flow diffusion are coupled into the process simulation of micro-leakage methane migration in the porous medium by using the UDF, and meanwhile, an initial concentration field is set by using a UDF program, so that the method is more suitable for micro-leakage meth