The velocities are obtained as a solution to Stokes' equation.
Light grey represents large velocities, dark grey low velocities.
The massively parallel implementation allows to treat complex pore spaces of up to voxels. Usually such large systems are treated by lattice Boltzmann methods. We find that qualitative predictions of the transport properties from measurements of the local percolation probabilities agree very well with our numerical results. Second, if one is judging the quality of computer generated models of porous media, the transport properties of the models i.e. their agreement with the properties of the experimental sandstone is an important criterion. We find, that especially stochastic models fail in reconstructing the high degree of connectivity of the pore space.