exponential.hh

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#ifndef DUMUX_MATERIAL_FLUIDMATRIX_TWO_P_INTERFACIAL_AREA_EXPONENTIAL
#define DUMUX_MATERIAL_FLUIDMATRIX_TWO_P_INTERFACIAL_AREA_EXPONENTIAL
 
#include <cmath>
#include <dune/common/exceptions.hh>
#include <dune/common/float_cmp.hh>
#include <dumux/common/parameters.hh>
 
namespace Dumux::FluidMatrix {
 
class InterfacialAreaExponential
{
public:
 
    template<class Scalar>
    struct Params
    {
        Params(Scalar swr = 0, Scalar a1 = 0, Scalar a2 = 0, Scalar a3 = 0)
        : swr_(swr), a1_(a1), a2_(a2), a3_(a3) {}
 
        Scalar swr() const { return swr_; }
        void setSwr(Scalar swr) { swr_ = swr; }
 
        Scalar a1() const { return a1_; }
        void setA1(Scalar a1) { a1_ = a1; }
 
        Scalar a2() const { return a2_; }
        void setA2(Scalar a2) { a2_ = a2; }
 
        Scalar a3() const { return a3_; }
        void setA3(Scalar a3) { a3_ = a3; }
 
        bool operator== (const Params& p) const
        {
            return Dune::FloatCmp::eq(swr(), p.swr(), 1e-6)
                   && Dune::FloatCmp::eq(a1(), p.a1(), 1e-6)
                   && Dune::FloatCmp::eq(a2(), p.a2(), 1e-6)
                   && Dune::FloatCmp::eq(a3(), p.a3(), 1e-6);
        }
 
    private:
        Scalar swr_, a1_, a2_, a3_;
    };
 
    template<class Scalar = double>
    static Params<Scalar> makeParams(const std::string& paramGroup)
    {
        const auto swr = getParamFromGroup<Scalar>(paramGroup, "Swr", 0.0);
        const auto a1 = getParamFromGroup<Scalar>(paramGroup, "A1");
        const auto a2 = getParamFromGroup<Scalar>(paramGroup, "A2");
        const auto a3 = getParamFromGroup<Scalar>(paramGroup, "A3");
        return {swr, a1, a2, a3};
    }
 
 
    template<class Scalar>
    static Scalar area(const Scalar swe, const Scalar pc, const Params<Scalar>& params)
    {
        const Scalar a1 = params.a1();
        const Scalar a2 = params.a2();
        const Scalar a3 = params.a3();
        const Scalar swr = params.swr();
        using std::exp;
        return a1 * (swr-swe) * (1-swe) + a2 * (swr-swe) * (1-swe) * exp( a3 * pc) ;
    }
 
    template<class Scalar>
    static Scalar darea_dpc(const Scalar swe, const Scalar pc, const Params<Scalar>& params)
    {
        const Scalar a2 = params.a2();
        const Scalar a3 = params.a3();
        const Scalar swr = params.swr();
        using std::exp;
        return a2 * a3 * (swr-swe) * (1-swe) * exp(a3*pc);
    }
 
    template<class Scalar>
    static Scalar darea_dsw(const Scalar swe, const Scalar pc, const Params<Scalar>& params)
    {
        Scalar a1 = params.a1();
        Scalar a2 = params.a2();
        Scalar a3 = params.a3();
        Scalar swr = params.swr();
        using std::exp;
        return - a1 *(1+swr-2*swe) - a2 * exp(a3*pc) * (1+swr-2*swe);
    }
 
};
 
} // namespace Dumux::FluidMatrix
 
#endif