maxwellstefandiffusioncoefficients.hh

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#ifndef DUMUX_FLUX_MAXWELLSTEFAN_DIFFUSION_COEFFICIENTS_HH
#define DUMUX_FLUX_MAXWELLSTEFAN_DIFFUSION_COEFFICIENTS_HH
 
#include <array>
#include <cassert>
 
namespace Dumux {

template <class Scalar, int numPhases, int numComponents>
class MaxwellStefanDiffusionCoefficients
{
public:
    template<class DiffCoeffFunc>
    void update(const DiffCoeffFunc& computeDiffCoeff)
    {
        for (int phaseIdx = 0; phaseIdx < numPhases; ++ phaseIdx)
            for (int compIIdx = 0; compIIdx < numComponents; ++compIIdx)
                for (int compJIdx = compIIdx+1; compJIdx < numComponents; ++compJIdx)
                    diffCoeff_[getIndex_(phaseIdx, compIIdx, compJIdx)]
                        = computeDiffCoeff(phaseIdx, compIIdx, compJIdx);
    }
 
    Scalar operator() (int phaseIdx, int compIIdx, int compJIdx) const
    {
        sortComponentIndices_(compIIdx, compJIdx);
        assert(compIIdx != compJIdx);
        return diffCoeff_[getIndex_(phaseIdx, compIIdx, compJIdx)];
    }
 
private:
    std::array<Scalar, (numPhases * ((numComponents * (numComponents - 1)) / 2))> diffCoeff_;

    constexpr int getIndex_(int phaseIdx, int compIIdx, int compJIdx) const
    {
        return phaseIdx * ((numComponents * (numComponents - 1)) / 2)
               + compIIdx * numComponents
               - ((compIIdx * (compIIdx + 1)) / 2)
               + compJIdx - (compIIdx +1);
    }
 
    void sortComponentIndices_(int& compIIdx, int& compJIdx) const
    { if (compIIdx > compJIdx) std::swap(compIIdx, compJIdx); }
};
 
} // end namespace Dumux
 
#endif