velocityreconstruction.hh

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#ifndef DUMUX_NAVIERSTOKES_STAGGERED_VELOCITYRECONSTRUCTION_HH
#define DUMUX_NAVIERSTOKES_STAGGERED_VELOCITYRECONSTRUCTION_HH
#include <algorithm>
#include <dumux/discretization/method.hh>
 
namespace Dumux {

struct StaggeredVelocityReconstruction
{
    template<class VelocityHelper, class FVElementGeometry>
    static auto cellCenterVelocity(const VelocityHelper& getFaceVelocity,
                                   const FVElementGeometry& fvGeometry)
    {
        static_assert(FVElementGeometry::GridGeometry::discMethod == DiscretizationMethods::cctpfa);
        using VelocityVector = typename FVElementGeometry::GridGeometry::GlobalCoordinate;
        VelocityVector result(0.0);
 
        const auto directionIndex = [&](const auto& vector)
        {
            return std::find_if(vector.begin(), vector.end(), [](const auto& x) { return std::abs(x) > 1e-8; } ) - vector.begin();
        };
 
        for (const auto& scvf : scvfs(fvGeometry))
        {
            const auto dirIdx = directionIndex(scvf.unitOuterNormal());
            result[dirIdx] += 0.5*getFaceVelocity(fvGeometry, scvf)[dirIdx];
        }
 
        return result;
    }
};
 
} // end namespace Dumux
 
#endif // DUMUX_NAVIERSTOKES_STAGGERED_VELOCITYRECONSTRUCTION_HH