Hi everyone,
Just to finish what we discussed here: the specific example how to find out what numbers exactly you put in a porous media properties is the following: the darcy eq. in OpenFOAM (eq. 3 here) you put in correspondance with semi-emperical data here - slide 207 here - eq (6.4-14).
This gives you the following equations:
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d = 150 (1-eps)^2 / (eps^2 * D^2)
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f = 2 * 1.75 * (1-eps) / (eps^3 * D)
Where eps and D is characteristics of your porous media (porosity and mean particles diameter).