discretization/box/subcontrolvolume.hh

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#ifndef DUMUX_DISCRETIZATION_BOX_SUBCONTROLVOLUME_HH
#define DUMUX_DISCRETIZATION_BOX_SUBCONTROLVOLUME_HH
 
#include <dune/geometry/multilineargeometry.hh>
 
#include <dumux/common/math.hh>
#include <dumux/common/indextraits.hh>
#include <dumux/discretization/subcontrolvolumebase.hh>
#include <dumux/discretization/box/boxgeometryhelper.hh>
 
namespace Dumux {

template<class GridView>
struct BoxDefaultScvGeometryTraits
{
    using Grid = typename GridView::Grid;
 
    static const int dim = Grid::dimension;
    static const int dimWorld = Grid::dimensionworld;
 
    template <class ct>
    struct ScvMLGTraits : public Dune::MultiLinearGeometryTraits<ct>
    {
        // we use static vectors to store the corners as we know
        // the number of corners in advance (2^(dim) corners (1<<(dim))
        template< int mydim, int cdim >
        struct CornerStorage
        {
            using Type = std::array< Dune::FieldVector< ct, cdim >, (1<<(dim)) >;
        };
 
        // we know all scvfs will have the same geometry type
        template< int mydim >
        struct hasSingleGeometryType
        {
            static const bool v = true;
            static const unsigned int topologyId = Dune::Impl::CubeTopology< mydim >::type::id;
        };
    };
 
    using GridIndexType = typename IndexTraits<GridView>::GridIndex;
    using LocalIndexType = typename IndexTraits<GridView>::LocalIndex;
    using Scalar = typename Grid::ctype;
    using Geometry = Dune::MultiLinearGeometry<Scalar, dim, dimWorld, ScvMLGTraits<Scalar>>;
    using CornerStorage = typename ScvMLGTraits<Scalar>::template CornerStorage<dim, dimWorld>::Type;
    using GlobalPosition = typename CornerStorage::value_type;
};

template<class GV,
         class T = BoxDefaultScvGeometryTraits<GV> >
class BoxSubControlVolume
: public SubControlVolumeBase<BoxSubControlVolume<GV, T>, T>
{
    using ThisType = BoxSubControlVolume<GV, T>;
    using ParentType = SubControlVolumeBase<ThisType, T>;
    using Geometry = typename T::Geometry;
    using GridIndexType = typename T::GridIndexType;
    using LocalIndexType = typename T::LocalIndexType;
    using Scalar = typename T::Scalar;
    using CornerStorage = typename T::CornerStorage;
    enum { dim = Geometry::mydimension };
 
public:
    using GlobalPosition = typename T::GlobalPosition;
    using Traits = T;

    BoxSubControlVolume() = default;
 
    // the contructor in the box case
    template<class GeometryHelper>
    BoxSubControlVolume(const GeometryHelper& geometryHelper,
                        LocalIndexType scvIdx,
                        GridIndexType elementIndex,
                        GridIndexType dofIndex)
    : corners_(geometryHelper.getScvCorners(scvIdx)),
      center_(0.0),
      volume_(geometryHelper.scvVolume(corners_)),
      elementIndex_(elementIndex),
      localDofIdx_(scvIdx),
      dofIndex_(dofIndex)
    {
        // compute center point
        for (const auto& corner : corners_)
            center_ += corner;
        center_ /= corners_.size();
    }

    const GlobalPosition& center() const
    {
        return center_;
    }

    Scalar volume() const
    {
        return volume_;
    }

    // e.g. for integration
    Geometry geometry() const
    {
        return Geometry(Dune::GeometryTypes::cube(dim), corners_);
    }

    LocalIndexType localDofIndex() const
    {
        return localDofIdx_;
    }

    LocalIndexType indexInElement() const
    {
        return localDofIdx_;
    }

    GridIndexType dofIndex() const
    {
        return dofIndex_;
    }
 
    // The position of the dof this scv is embedded in
    const GlobalPosition& dofPosition() const
    {
        // The corner list is defined such that the first entry is the vertex itself
        return corners_[0];
    }

    GridIndexType elementIndex() const
    {
        return elementIndex_;
    }

    const GlobalPosition& corner(LocalIndexType localIdx) const
    {
        assert(localIdx < corners_.size() && "provided index exceeds the number of corners");
        return corners_[localIdx];
    }
 
private:
    CornerStorage corners_;
    GlobalPosition center_;
    Scalar volume_;
    GridIndexType elementIndex_;
    LocalIndexType localDofIdx_;
    GridIndexType dofIndex_;
};
 
} // end namespace Dumux
 
#endif