Direct Simulation of Moderately Rarefied Gas Flows within Core Samples

Abstract

This paper is devoted to the numerical simulation of isothermal moderately rarefied gas flows in three-dimensional spaces with a complex voxel geometry corresponding to the pore space of core (rock) samples. Classical Maxwell slip boundary conditions are used to take into account the slippage effect on the solid boundaries. The simulation results for several core samples under different averaged pressures are presented. The qualitatively correct dependence of the Klinkenberg slippage coefficient on the absolute intrinsic permeability is obtained.