diffusivityconstanttortuosity.hh

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#ifndef DUMUX_MATERIAL_DIFFUSIVITY_CONSTANT_TORTUOSITY_HH
#define DUMUX_MATERIAL_DIFFUSIVITY_CONSTANT_TORTUOSITY_HH
 
#include <dumux/common/parameters.hh>
 
namespace Dumux {

template<class Scalar>
class DiffusivityConstantTortuosity
{
public:
    template<class VolumeVariables>
    static Scalar effectiveDiffusionCoefficient(const VolumeVariables& volVars,
                                                const int phaseIdx,
                                                const int compIdxI,
                                                const int compIdxJ)
    {
        static const Scalar tau = getParam<Scalar>("SpatialParams.Tortuosity", 0.5);
        const Scalar diffCoeff = volVars.diffusionCoefficient(phaseIdx, compIdxI, compIdxJ);
        return volVars.porosity() * volVars.saturation(phaseIdx) * tau * diffCoeff;
    }
 
};
} // end namespace Dumux
 
#endif