tpfa/computetransmissibility.hh

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#ifndef DUMUX_DISCRETIZATION_CC_TPFA_COMPUTE_TRANSMISSIBILITY_HH
#define DUMUX_DISCRETIZATION_CC_TPFA_COMPUTE_TRANSMISSIBILITY_HH
 
#include <dune/common/typetraits.hh>
#include <dune/common/fmatrix.hh>
 
namespace Dumux {
 
template< class SubControlVolumeFace, class SubControlVolume, class Tensor >
typename Tensor::field_type computeTpfaTransmissibility(const SubControlVolumeFace& scvf,
                                                        const SubControlVolume& scv,
                                                        const Tensor& T,
                                                        typename SubControlVolume::Traits::Scalar extrusionFactor)
{
    using GlobalPosition = typename SubControlVolumeFace::Traits::GlobalPosition;
    GlobalPosition Knormal;
    T.mv(scvf.unitOuterNormal(), Knormal);
 
    auto distanceVector = scvf.ipGlobal();
    distanceVector -= scv.center();
    distanceVector /= distanceVector.two_norm2();
 
    return (Knormal*distanceVector) * extrusionFactor;
}
 
template< class SubControlVolumeFace,
          class SubControlVolume,
          class Tensor,
          typename std::enable_if_t<Dune::IsNumber<Tensor>::value, int> = 0 >
Tensor computeTpfaTransmissibility(const SubControlVolumeFace& scvf,
                                   const SubControlVolume &scv,
                                   Tensor t,
                                   typename SubControlVolumeFace::Traits::Scalar extrusionFactor)
{
    auto distanceVector = scvf.ipGlobal();
    distanceVector -= scv.center();
    distanceVector /= distanceVector.two_norm2();
 
    return t * extrusionFactor * (distanceVector * scvf.unitOuterNormal());
}
 
} // end namespace Dumux
 
#endif