nonconformingfecache.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_NONCONFORMING_FECACHE_HH
#define DUMUX_DISCRETIZATION_NONCONFORMING_FECACHE_HH
 
#include <memory>
 
#include <dune/common/exceptions.hh>
#include <dune/geometry/type.hh>
 
#include <dune/localfunctions/crouzeixraviart.hh>
#include <dune/localfunctions/rannacherturek.hh>
#include <dune/localfunctions/common/virtualinterface.hh>
#include <dune/localfunctions/common/virtualwrappers.hh>
 
namespace Dumux {
 
template< class CoordScalar, class Scalar, unsigned int dim>
class NonconformingFECache
{
    static_assert(dim == 2 || dim == 3, "Non-conforming FE spaces only implemented for 2D and 3D grids");
 
    // These are so-called non-conforming finite element spaces
    // the local basis is only continuous at given points on the faces
    using RT = Dune::RannacherTurekLocalFiniteElement<CoordScalar, Scalar, dim>;
    using CR = Dune::CrouzeixRaviartLocalFiniteElement<CoordScalar, Scalar, dim>;
 
public:
    using FiniteElementType = Dune::LocalFiniteElementVirtualInterface<typename RT::Traits::LocalBasisType::Traits>;
 
    NonconformingFECache()
    : rtBasis_(std::make_unique<Dune::LocalFiniteElementVirtualImp<RT>>(RT{}))
    , crBasis_(std::make_unique<Dune::LocalFiniteElementVirtualImp<CR>>(CR{}))
    {}
 
    const FiniteElementType& get(const Dune::GeometryType& gt) const
    {
        if (gt.isSimplex())
            return *crBasis_;
        else if (gt.isCube())
            return *rtBasis_;
        else
            DUNE_THROW(Dune::NotImplemented,
                "Non-conforming local finite element for geometry type " << gt
            );
    }
 
private:
    std::unique_ptr<FiniteElementType> rtBasis_;
    std::unique_ptr<FiniteElementType> crBasis_;
};
 
} // end namespace Dumux
 
#endif