Forchheimer coefficient from LBM simulations

Hi there,

I am wondering if anybody has used the LBM and OpenLB/Palabos for inertial flow simulation in porous media. I used OpenLB and Palabos for porous media flow simulations and although the permeabilities came out well, the beta factors (Forchheimer coefficients) are not comparable with analytical and experimental results.

Any information about this will be appreciated.