Fig. 11

Pore network models from OpenPNM superimposed with OpenPNM models of particles. Black spheres are quartz sand grains sized by volume, pore connections are removed, and pores are color-coded by diameter (from small to large: purple, dark blue, light blue, green, yellow, orange, red). Left, a sample from brick A. Right, a sample from brick F with more very large sand grains and pores; often large grains and pores are touching, with some large pores in contact with multiple grains