porositydeformation.hh

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#ifndef DUMUX_MATERIAL_POROSITY_DEFORMATION_HH
#define DUMUX_MATERIAL_POROSITY_DEFORMATION_HH
 
#include <dumux/discretization/evalgradients.hh>
 
namespace Dumux {
 
template<class Scalar>
class PorosityDeformation
{
public:
    template< class FVGridGeom, class ElemSol >
    static Scalar evaluatePorosity(const FVGridGeom& gridGeometry,
                                   const typename FVGridGeom::GridView::template Codim<0>::Entity& element,
                                   const typename FVGridGeom::GridView::template Codim<0>::Entity::Geometry::GlobalCoordinate& globalPos,
                                   const ElemSol& elemSol,
                                   Scalar refPoro,
                                   Scalar minPoro = 0.0,
                                   Scalar maxPoro = 1.0)
    {
        // compute divergence of displacement at the given position
        Scalar divU = 0.0;
        const auto gradU = evalGradients(element, element.geometry(), gridGeometry, elemSol, globalPos);
        for (int dir = 0; dir < FVGridGeom::GridView::dimension; ++dir)
            divU += gradU[dir][dir];
 
        using std::clamp;
        return clamp((refPoro+divU)/(1.0+divU), minPoro, maxPoro);
    }
 
    template< class FVGridGeom, class ElemSol >
    static Scalar evaluatePorosity(const FVGridGeom& gridGeometry,
                                   const typename FVGridGeom::GridView::template Codim<0>::Entity& element,
                                   const typename FVGridGeom::SubControlVolume& scv,
                                   const ElemSol& elemSol,
                                   Scalar refPoro,
                                   Scalar minPoro = 0.0)
    {
        // evaluate the porosity at the scv center
        return evaluatePorosity(gridGeometry, element, scv.center(), elemSol, refPoro, minPoro);
    }
};
 
} // namespace Dumux
 
#endif