diffusivitymillingtonquirk.hh

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#ifndef DUMUX_MATERIAL_DIFFUSIVITY_MILLINGTON_QUIRK_HH
#define DUMUX_MATERIAL_DIFFUSIVITY_MILLINGTON_QUIRK_HH
 
#include <cmath>
 
namespace Dumux {
 
template<class Scalar>
class DiffusivityMillingtonQuirk
{
public:
    static Scalar effectiveDiffusivity(const Scalar porosity,
                                       const Scalar saturation,
                                       const Scalar diffCoeff)
    {
        // instead of D_eff,pm = phi * Sw * 1/phi^2 * (phi * Sw)^(7/3) * D
        // we calculate the more efficient
        // D_eff,pm = phi * Sw^3 * cubicroot(phi * Sw) * D
 
        using std::cbrt;
        return porosity * (saturation * saturation * saturation)
               * cbrt(porosity * saturation) * diffCoeff;
    }
};
}
#endif