boundary/freeflowporousmedium/ffmomentumpm/couplingmapper.hh

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#ifndef DUMUX_MULTIDOMAIN_FREEFLOWMOMENTUM_POROUSMEDIUM_COUPLINGMAPPER_HH
#define DUMUX_MULTIDOMAIN_FREEFLOWMOMENTUM_POROUSMEDIUM_COUPLINGMAPPER_HH
 
#include <iostream>
#include <unordered_map>
#include <tuple>
#include <vector>
 
#include <dune/common/timer.hh>
#include <dune/common/exceptions.hh>
#include <dune/common/indices.hh>
 
#include <dumux/geometry/intersectingentities.hh>
#include <dumux/discretization/method.hh>
 
namespace Dumux {
 
template<class MDTraits, class CouplingManager>
class FreeFlowMomentumPorousMediumCouplingMapper
{
    using Scalar = typename MDTraits::Scalar;
 
    template<std::size_t i> using GridGeometry = typename MDTraits::template SubDomain<i>::GridGeometry;
    template<std::size_t i> using SubControlVolume = typename GridGeometry<i>::SubControlVolume;
    template<std::size_t i> using SubControlVolumeFace = typename GridGeometry<i>::SubControlVolumeFace;
    template<std::size_t i> using GridView = typename GridGeometry<i>::GridView;
    template<std::size_t i> using Element = typename GridView<i>::template Codim<0>::Entity;
 
    template<std::size_t i>
    static constexpr auto domainIdx()
    { return typename MDTraits::template SubDomain<i>::Index{}; }
 
    template<std::size_t i>
    static constexpr bool isFcStaggered()
    { return GridGeometry<i>::discMethod == DiscretizationMethods::fcstaggered; }
 
    template<std::size_t i>
    static constexpr bool isCCTpfa()
    { return GridGeometry<i>::discMethod == DiscretizationMethods::cctpfa; }
 
    struct ScvfInfoPM
    {
        std::size_t eIdxOutside;
        std::size_t flipScvfIdx;
    };
 
    struct ScvfInfoFF
    {
        std::size_t eIdxOutside;
        std::size_t flipScvfIdx;
        std::size_t dofIdxOutside;
    };
 
    using FlipScvfMapTypePM = std::unordered_map<std::size_t, ScvfInfoPM>;
    using FlipScvfMapTypeFF = std::unordered_map<std::size_t, ScvfInfoFF>;
    using MapType = std::unordered_map<std::size_t, std::vector<std::size_t>>;
 
    static constexpr std::size_t numSD = MDTraits::numSubDomains;
 
public:
    void update(const CouplingManager& couplingManager)
    {
        // TODO: Box and multiple domains
        static_assert(numSD == 2, "More than two subdomains not implemented!");
        static_assert(isFcStaggered<0>() && isCCTpfa<1>(), "Only coupling between fcstaggered and cctpfa implemented!");
 
        Dune::Timer watch;
        std::cout << "Initializing the coupling map..." << std::endl;
 
        for (std::size_t domIdx = 0; domIdx < numSD; ++domIdx)
            stencils_[domIdx].clear();
 
        std::get<CouplingManager::freeFlowMomentumIndex>(scvfInfo_).clear();
        std::get<CouplingManager::porousMediumIndex>(scvfInfo_).clear();
 
        const auto& freeFlowMomentumProblem = couplingManager.problem(CouplingManager::freeFlowMomentumIndex);
        const auto& porousMediumProblem = couplingManager.problem(CouplingManager::porousMediumIndex);
        const auto& freeFlowMomentumGG = freeFlowMomentumProblem.gridGeometry();
        const auto& porousMediumGG = porousMediumProblem.gridGeometry();
 
        isCoupledFFDof_.resize(freeFlowMomentumGG.numScvf(), false);
        isCoupledFFElement_.resize(freeFlowMomentumGG.gridView().size(0), false);
        isCoupledScvf_[CouplingManager::freeFlowMomentumIndex].resize(freeFlowMomentumGG.numScvf(), false);
        isCoupledScvf_[CouplingManager::porousMediumIndex].resize(porousMediumGG.numScvf(), false);
 
        auto pmFvGeometry = localView(porousMediumGG);
        auto ffFvGeometry = localView(freeFlowMomentumGG);
 
        for (const auto& pmElement : elements(porousMediumGG.gridView()))
        {
            pmFvGeometry.bindElement(pmElement);
 
            for (const auto& pmScvf : scvfs(pmFvGeometry))
            {
                // skip all non-boundaries
                if (!pmScvf.boundary())
                    continue;
 
                // get elements intersecting with the scvf center
                // for robustness add epsilon in unit outer normal direction
                const auto eps = (pmScvf.ipGlobal() - pmFvGeometry.geometry(pmScvf).corner(0)).two_norm()*1e-8;
                auto globalPos = pmScvf.ipGlobal(); globalPos.axpy(eps, pmScvf.unitOuterNormal());
                const auto indices = intersectingEntities(globalPos, freeFlowMomentumGG.boundingBoxTree());
 
                // skip if no intersection was found
                if (indices.empty())
                    continue;
 
                // sanity check
                if (indices.size() > 1)
                    DUNE_THROW(Dune::InvalidStateException, "Are you sure your sub-domain grids are conformingly discretized on the common interface?");
 
                // add the pair to the multimap
                const auto pmElemIdx = porousMediumGG.elementMapper().index(pmElement);
                const auto ffElemIdx = indices[0];
                const auto& ffElement = freeFlowMomentumGG.element(ffElemIdx);
                ffFvGeometry.bindElement(ffElement);
 
                for (const auto& ffScvf : scvfs(ffFvGeometry)) // TODO: maybe better iterate over all scvs
                {
                    // TODO this only takes the scv directly at the interface, maybe extend
                    if (!ffScvf.boundary() || !ffScvf.isFrontal())
                        continue;
 
                    const auto dist = (pmScvf.ipGlobal() - ffScvf.ipGlobal()).two_norm();
                    if (dist > eps)
                        continue;
 
                    const auto& ffScv = ffFvGeometry.scv(ffScvf.insideScvIdx());
                    stencils_[CouplingManager::porousMediumIndex][pmElemIdx].push_back(ffScv.dofIndex());
                    stencils_[CouplingManager::freeFlowMomentumIndex][ffScv.dofIndex()].push_back(pmElemIdx);
 
                    // mark the scvf and find and mark the flip scvf
                    isCoupledScvf_[CouplingManager::porousMediumIndex][pmScvf.index()] = true;
                    isCoupledScvf_[CouplingManager::freeFlowMomentumIndex][ffScvf.index()] = true;
 
                    // add all lateral free-flow scvfs touching the coupling interface ("standing" or "lying")
                    for (const auto& otherFfScvf : scvfs(ffFvGeometry, ffScv))
                    {
                        if (otherFfScvf.isLateral())
                        {
                            // the orthogonal scvf has to lie on the coupling interface
                            const auto& lateralOrthogonalScvf = ffFvGeometry.lateralOrthogonalScvf(otherFfScvf);
                            isCoupledLateralScvf_[lateralOrthogonalScvf.index()] = true;
 
                            // the "standing" scvf is marked as coupled if it does not lie on a boundary or if that boundary itself is a coupling interface
                            if (!otherFfScvf.boundary())
                                isCoupledLateralScvf_[otherFfScvf.index()] = true;
                            else
                            {
                                // for robustness add epsilon in unit outer normal direction
                                const auto otherScvfEps = (otherFfScvf.ipGlobal() - ffFvGeometry.geometry(otherFfScvf).corner(0)).two_norm()*1e-8;
                                auto otherScvfGlobalPos = otherFfScvf.center(); otherScvfGlobalPos.axpy(otherScvfEps, otherFfScvf.unitOuterNormal());
 
                                if (!intersectingEntities(otherScvfGlobalPos, porousMediumGG.boundingBoxTree()).empty())
                                    isCoupledLateralScvf_[otherFfScvf.index()] = true;
                            }
                        }
                    }
                    isCoupledFFDof_[ffScv.dofIndex()] = true;
                    isCoupledFFElement_[ffElemIdx] = true;
 
                    std::get<CouplingManager::porousMediumIndex>(scvfInfo_)[pmScvf.index()] = ScvfInfoPM{ffElemIdx, ffScvf.index()};
                    std::get<CouplingManager::freeFlowMomentumIndex>(scvfInfo_)[ffScvf.index()] = ScvfInfoFF{pmElemIdx, pmScvf.index(), ffScv.dofIndex()};
                }
            }
        }
 
        std::cout << "took " << watch.elapsed() << " seconds." << std::endl;
    }
 
    const std::vector<std::size_t>& couplingStencil(Dune::index_constant<CouplingManager::porousMediumIndex> domainI,
                                                    const std::size_t eIdxI,
                                                    Dune::index_constant<CouplingManager::freeFlowMomentumIndex> domainJ) const
    {
        if (isCoupledElement(domainI, eIdxI))
            return stencils_[CouplingManager::porousMediumIndex].at(eIdxI);
        else
            return emptyStencil_;
    }
 
    const std::vector<std::size_t>& couplingStencil(Dune::index_constant<CouplingManager::freeFlowMomentumIndex> domainI,
                                                    const Element<CouplingManager::freeFlowMomentumIndex>& elementI,
                                                    const SubControlVolume<CouplingManager::freeFlowMomentumIndex>& scvI,
                                                    Dune::index_constant<CouplingManager::porousMediumIndex> domainJ) const
    {
        if (isCoupled(domainI, scvI))
            return stencils_[CouplingManager::freeFlowMomentumIndex].at(scvI.dofIndex());
        else
            return emptyStencil_;
    }
 
    template<std::size_t i>
    bool isCoupledElement(Dune::index_constant<i>, std::size_t eIdx) const
    {
        if constexpr (i == CouplingManager::porousMediumIndex)
            return static_cast<bool>(stencils_[i].count(eIdx));
        else
            return isCoupledFFElement_[eIdx];
    }
 
    template<std::size_t i>
    bool isCoupled(Dune::index_constant<i> domainI,
                   const SubControlVolumeFace<i>& scvf) const
    {
        return isCoupledScvf_[i].at(scvf.index());
    }
 
    bool isCoupledLateralScvf(Dune::index_constant<CouplingManager::freeFlowMomentumIndex> domainI,
                              const SubControlVolumeFace<CouplingManager::freeFlowMomentumIndex>& scvf) const
    { return isCoupledLateralScvf_.count(scvf.index()); }
 
    bool isCoupled(Dune::index_constant<CouplingManager::freeFlowMomentumIndex> domainI,
                   const SubControlVolume<CouplingManager::freeFlowMomentumIndex>& scv) const
    { return isCoupledFFDof_[scv.dofIndex()]; }
 
    template<std::size_t i>
    std::size_t flipScvfIndex(Dune::index_constant<i> domainI,
                              const SubControlVolumeFace<i>& scvf) const
    {
        return std::get<i>(scvfInfo_).at(scvf.index()).flipScvfIdx;
    }
 
    template<std::size_t i>
    std::size_t outsideElementIndex(Dune::index_constant<i> domainI,
                                    const SubControlVolumeFace<i>& scvf) const
    {
        return std::get<i>(scvfInfo_).at(scvf.index()).eIdxOutside;
    }
 
    template<std::size_t i>
    std::size_t outsideDofIndex(Dune::index_constant<i> domainI,
                                const SubControlVolumeFace<i>& scvf) const
    {
        if constexpr (i == CouplingManager::porousMediumIndex)
            return outsideElementIndex(domainI, scvf);
        else
            return std::get<i>(scvfInfo_).at(scvf.index()).dofIdxOutside;
    }
 
private:
    std::array<MapType, numSD> stencils_;
    std::vector<std::size_t> emptyStencil_;
    std::array<std::vector<bool>, numSD> isCoupledScvf_;
    std::unordered_map<std::size_t, bool> isCoupledLateralScvf_;
    std::vector<bool> isCoupledFFDof_;
    std::vector<bool> isCoupledFFElement_;
    std::tuple<FlipScvfMapTypeFF, FlipScvfMapTypePM> scvfInfo_;
 
};
 
} // end namespace Dumux
 
#endif