frictionlaw.hh

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#ifndef DUMUX_MATERIAL_FLUIDMATRIX_FRICTIONLAW_HH
#define DUMUX_MATERIAL_FLUIDMATRIX_FRICTIONLAW_HH
 
#include <algorithm>
#include <cmath>
 
#include <dune/common/fvector.hh>
 
namespace Dumux {
template <typename VolumeVariables >
class FrictionLaw
{
    using Scalar = typename VolumeVariables::PrimaryVariables::value_type;
public:
    virtual Dune::FieldVector<Scalar, 2> shearStress(const VolumeVariables& volVar) const = 0;
 
    Scalar limitRoughH(const Scalar roughnessHeight, const Scalar waterDepth) const
    {
        using std::min;
        using std::max;
 
        Scalar mobilityMax = 1.0; 
 
        Scalar minUpperH = roughnessHeight * 2.0;
        Scalar sw = min(waterDepth * (1.0/minUpperH),1.0);
        sw = max(0.0,sw);
        auto mobility = mobilityMax /(1 + (1.0-sw)*(1.0-sw));
        return roughnessHeight * (1.0 - mobility);
    }
 
    virtual ~FrictionLaw() = default;
};
 
} // end namespace Dumux
 
#endif