integrationpointsource.hh

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#ifndef DUMUX_INTEGRATION_POINTSOURCE_HH
#define DUMUX_INTEGRATION_POINTSOURCE_HH
 
#include <type_traits>
#include <dune/common/reservedvector.hh>
#include <dumux/common/pointsource.hh>
#include <dumux/discretization/method.hh>
 
namespace Dumux {

template<class GlobalPosition, class SourceValues, typename IdType = std::size_t>
class IntegrationPointSource : public IdPointSource<GlobalPosition, SourceValues, IdType>
{
    using ParentType = IdPointSource<GlobalPosition, SourceValues, IdType>;
    using Scalar = std::decay_t<decltype(std::declval<SourceValues>()[0])>;
 
public:
    IntegrationPointSource(GlobalPosition pos, SourceValues values, IdType id,
                           Scalar qpweight, Scalar integrationElement,
                           const std::vector<std::size_t>& elementIndices)
      : ParentType(pos, values, id),
        qpweight_(qpweight), integrationElement_(integrationElement),
        elementIndices_(elementIndices) {}

    // value known at the time of initialization
    IntegrationPointSource(GlobalPosition pos, IdType id,
                           Scalar qpweight, Scalar integrationElement,
                           const std::vector<std::size_t>& elementIndices)
      : ParentType(pos, id),
        qpweight_(qpweight), integrationElement_(integrationElement),
        elementIndices_(elementIndices) {}
 
 
    Scalar quadratureWeight() const
    {
        return qpweight_;
    }
 
    Scalar integrationElement() const
    {
        return integrationElement_;
    }
 
    const std::vector<std::size_t>& elementIndices() const
    {
        return elementIndices_;
    }

    IntegrationPointSource& operator= (const SourceValues& values)
    {
        ParentType::operator=(values);
        return *this;
    }

    IntegrationPointSource& operator= (Scalar s)
    {
        ParentType::operator=(s);
        return *this;
    }
 
private:
    Scalar qpweight_;
    Scalar integrationElement_;
    std::vector<std::size_t> elementIndices_;
};

class IntegrationPointSourceHelper
{
 
public:
    template<class GridGeometry, class PointSource, class PointSourceMap>
    static void computePointSourceMap(const GridGeometry& gridGeometry,
                                      std::vector<PointSource>& sources,
                                      PointSourceMap& pointSourceMap)
    {
        for (auto&& source : sources)
        {
            // compute in which elements the point source falls
            const auto& entities = source.elementIndices();
            // split the source values equally among all concerned entities
            source.setEmbeddings(source.embeddings()*entities.size());
            // loop over all intersected elements
            for (unsigned int eIdx : entities)
            {
                if (GridGeometry::discMethod == DiscretizationMethod::box)
                {
                    // check in which subcontrolvolume(s) we are
                    const auto element = gridGeometry.boundingBoxTree().entitySet().entity(eIdx);
                    auto fvGeometry = localView(gridGeometry);
                    fvGeometry.bindElement(element);
                    const auto globalPos = source.position();
                    // loop over all sub control volumes and check if the point source is inside
                    constexpr int dim = GridGeometry::GridView::dimension;
                    Dune::ReservedVector<std::size_t, 1<<dim> scvIndices;
                    for (auto&& scv : scvs(fvGeometry))
                        if (intersectsPointGeometry(globalPos, scv.geometry()))
                            scvIndices.push_back(scv.indexInElement());
 
                    // for all scvs that where tested positiv add the point sources
                    // to the element/scv to point source map
                    for (auto scvIdx : scvIndices)
                    {
                        const auto key = std::make_pair(eIdx, scvIdx);
                        if (pointSourceMap.count(key))
                            pointSourceMap.at(key).push_back(source);
                        else
                            pointSourceMap.insert({key, {source}});
                        // split equally on the number of matched scvs
                        auto& s = pointSourceMap.at(key).back();
                        s.setEmbeddings(scvIndices.size()*s.embeddings());
                    }
                }
                else
                {
                    // add the pointsource to the DOF map
                    const auto key = std::make_pair(eIdx, /*scvIdx=*/ 0);
                    if (pointSourceMap.count(key))
                        pointSourceMap.at(key).push_back(source);
                    else
                        pointSourceMap.insert({key, {source}});
                }
            }
        }
    }
};
 
} // end namespace Dumux
 
#endif