thermalconductivityaverage.hh

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#ifndef DUMUX_MATERIAL_THERMALCONDUCTIVITY_AVERAGE_HH
#define DUMUX_MATERIAL_THERMALCONDUCTIVITY_AVERAGE_HH
 
#include <algorithm>
 
namespace Dumux {

template<class Scalar>
class ThermalConductivityAverage
{
public:
    template<class VolumeVariables>
    static Scalar effectiveThermalConductivity(const VolumeVariables& volVars)
    {
        constexpr int numFluidPhases = VolumeVariables::numFluidPhases();
 
        // Get the thermal conductivities and the porosity from the volume variables
        Scalar lambdaFluid = 0.0;
        for (int phaseIdx = 0; phaseIdx < numFluidPhases; ++phaseIdx)
            lambdaFluid += volVars.fluidThermalConductivity(phaseIdx)*volVars.saturation(phaseIdx);
 
        const Scalar lambdaSolid = volVars.solidThermalConductivity();
        const Scalar porosity = volVars.porosity();
 
        return lambdaSolid*(1-porosity) + lambdaFluid*porosity;
    }
};
 
} // end namespace Dumux
 
#endif