rho_w rho_oil Density, wetting fluid mu_w mu_oil Dynamic viscosity, wetting fluid rho_nw rho_air Density, non-wetting fluid mu_nw mu_air Dynamic viscosity, non-wetting fluid alpha 3.58[1/m] Van Genuchten alpha parameter L 0.5 Van Genuchten L parameter N 3.1365 Van Genuchten N parameter M 1-1/N Van Genuchten M parameter kap_su 1104.41[mD] Permeability, upper layer theta_ru 0.0072 Residual volume fraction, upper layer sigma_ao 0.0259[H/m] Interfacial tension air-oil sigma sigma_ao/sigma_aw Ratio between interfacial tensions