Permeability Estimation Based on the Geometry of Pore Space via Random Walk on Grids

Figure 7

A void space formed among equal-sized solid spheres. The top face (red) is the outlet, and the bottom face (hidden) is the inlet; all the lateral planes (blue) are no-flow boundaries; the spherical faces (gray) are interfaces between the void and solid and are treated as a no-slip boundary in dynamic simulation.