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Right, so a bit more complicated. 

Hold up in the porous media may not be as simple as you think - read up on porosity, permeability, wetting effects etc.  So, how you define how the liquid moves may have a very significant effect on the result. 

Given that, do you think DPM-VOF is the best approach? Or could Eulerian and the porous media Corey model better suit your needs?