box/elementsolution.hh

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#ifndef DUMUX_BOX_ELEMENT_SOLUTION_HH
#define DUMUX_BOX_ELEMENT_SOLUTION_HH
 
#include <type_traits>
#include <dune/istl/bvector.hh>
#include <dumux/discretization/method.hh>
 
namespace Dumux {
 
template<class FVElementGeometry, class PV>
class BoxElementSolution
{
    using GridGeometry = typename FVElementGeometry::GridGeometry;
    using GridView = typename GridGeometry::GridView;
    using Element = typename GridView::template Codim<0>::Entity;
 
public:
    using PrimaryVariables = PV;
 
    BoxElementSolution() = default;
 
    template<class SolutionVector>
    BoxElementSolution(const Element& element, const SolutionVector& sol,
                       const GridGeometry& gridGeometry)
    {
        update(element, sol, gridGeometry);
    }
 
    template<class ElementVolumeVariables>
    BoxElementSolution(const Element& element, const ElementVolumeVariables& elemVolVars,
                       const FVElementGeometry& fvGeometry)
    {
        const auto numVert = element.subEntities(GridView::dimension);
        priVars_.resize(numVert);
        for (const auto& scv : scvs(fvGeometry))
            priVars_[scv.localDofIndex()] = elemVolVars[scv].priVars();
    }
 
    template<class SolutionVector>
    void update(const Element& element, const SolutionVector& sol,
                const GridGeometry& gridGeometry)
    {
        const auto numVert = element.subEntities(GridView::dimension);
        priVars_.resize(numVert);
        for (int vIdx = 0; vIdx < numVert; ++vIdx)
            priVars_[vIdx] = sol[gridGeometry.vertexMapper().subIndex(element, vIdx, GridView::dimension)];
    }
 
    template<class SolutionVector>
    void update(const Element& element, const SolutionVector& sol,
                const FVElementGeometry& fvGeometry)
    {
        const auto numVert = element.subEntities(GridView::dimension);
        priVars_.resize(numVert);
        for (const auto& scv : scvs(fvGeometry))
            priVars_[scv.localDofIndex()] = sol[scv.dofIndex()];
    }
 
    std::size_t size() const
    { return priVars_.size(); }
 
    template<typename IndexType>
    const PrimaryVariables& operator [](IndexType i) const
    { return priVars_[i]; }
 
    template<typename IndexType>
    PrimaryVariables& operator [](IndexType i)
    { return priVars_[i]; }
 
private:
    Dune::BlockVector<PrimaryVariables> priVars_;
};
 
template<class Element, class SolutionVector, class GridGeometry>
auto elementSolution(const Element& element, const SolutionVector& sol, const GridGeometry& gg)
-> std::enable_if_t<GridGeometry::discMethod == DiscretizationMethod::box,
                    BoxElementSolution<typename GridGeometry::LocalView,
                                      std::decay_t<decltype(std::declval<SolutionVector>()[0])>>
                    >
{
    using PrimaryVariables = std::decay_t<decltype(std::declval<SolutionVector>()[0])>;
    return BoxElementSolution<typename GridGeometry::LocalView, PrimaryVariables>(element, sol, gg);
}
 
template<class Element, class ElementVolumeVariables, class FVElementGeometry>
auto elementSolution(const Element& element, const ElementVolumeVariables& elemVolVars, const FVElementGeometry& gg)
-> std::enable_if_t<FVElementGeometry::GridGeometry::discMethod == DiscretizationMethod::box,
                    BoxElementSolution<FVElementGeometry,
                                       typename ElementVolumeVariables::VolumeVariables::PrimaryVariables>>
{
    using PrimaryVariables = typename ElementVolumeVariables::VolumeVariables::PrimaryVariables;
    return BoxElementSolution<FVElementGeometry, PrimaryVariables>(element, elemVolVars, gg);
}
 
} // end namespace Dumux
 
#endif