tpfa/computetransmissibility.hh

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// -*- mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
// vi: set et ts=4 sw=4 sts=4:
//
// SPDX-FileCopyrightInfo: Copyright © DuMux Project contributors, see AUTHORS.md in root folder
// SPDX-License-Identifier: GPL-3.0-or-later
//
#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 FVElementGeometry, class Tensor >
typename Tensor::field_type computeTpfaTransmissibility(const FVElementGeometry& fvGeometry,
                                                        const typename FVElementGeometry::SubControlVolumeFace& scvf,
                                                        const typename FVElementGeometry::SubControlVolume& scv,
                                                        const Tensor& T,
                                                        typename FVElementGeometry::SubControlVolume::Traits::Scalar extrusionFactor)
{
    using GlobalPosition = typename FVElementGeometry::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 FVElementGeometry,
          class Tensor,
          typename std::enable_if_t<Dune::IsNumber<Tensor>::value, int> = 0 >
Tensor computeTpfaTransmissibility(const FVElementGeometry& fvGeometry,
                                   const typename FVElementGeometry::SubControlVolumeFace& scvf,
                                   const typename FVElementGeometry::SubControlVolume& scv,
                                   Tensor t,
                                   typename FVElementGeometry::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