CALCULATION OF FILTRATION CHARACTERISTICS OF POROUS MEDIA BY THEIR DIGITIZED IMAGES WITH THE USE OF LATTICE BOLTZMANN EQUATIONS

We have investigated the features of using STR and MTR models of lattice Boltzmann equations for calculating the filtration characteristics of porous media with the use of their digital images. The results of calculations performed on the basis of these models were compared with the results of analytical calculations made with the use of stationary Navier-Stokes equations and continuity equations. Calculations of the laminar flow in a pipe with the use of the MTR model had a much higher accuracy as compared to analogous calculations by the SRT model and showed independence of the relaxation parameter. It has been established that for fluid flow in pore channels the MRT model and the Navier-Stokes equations give comparable results, whereas in using the SRT model the numerical solution depends on the relaxation parameter.