discretization/cellcentered/tpfa/gridfluxvariablescache.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_CCTPFA_GRID_FLUXVARSCACHE_HH
#define DUMUX_DISCRETIZATION_CCTPFA_GRID_FLUXVARSCACHE_HH
 
#include <dumux/parallel/parallel_for.hh>
 
// make the local view function available whenever we use this class
#include <dumux/discretization/localview.hh>
#include <dumux/discretization/cellcentered/tpfa/elementfluxvariablescache.hh>
 
namespace Dumux {
 
template<class P, class FVC, class FVCF>
struct CCTpfaDefaultGridFVCTraits
{
    using Problem = P;
    using FluxVariablesCache = FVC;
    using FluxVariablesCacheFiller = FVCF;
 
    template<class GridFluxVariablesCache, bool cachingEnabled>
    using LocalView = CCTpfaElementFluxVariablesCache<GridFluxVariablesCache, cachingEnabled>;
};
 
template<class Problem,
         class FluxVariablesCache,
         class FluxVariablesCacheFiller,
         bool EnableGridFluxVariablesCache = false,
         class Traits = CCTpfaDefaultGridFVCTraits<Problem, FluxVariablesCache, FluxVariablesCacheFiller> >
class CCTpfaGridFluxVariablesCache;
 
template<class P, class FVC, class FVCF, class TheTraits>
class CCTpfaGridFluxVariablesCache<P, FVC, FVCF, true, TheTraits>
{
    using Problem = typename TheTraits::Problem;
    using ThisType = CCTpfaGridFluxVariablesCache<P, FVC, FVCF, true, TheTraits>;
 
    using FluxVariablesCacheFiller = typename TheTraits::FluxVariablesCacheFiller;
public:
    using Traits = TheTraits;
 
    using FluxVariablesCache = typename Traits::FluxVariablesCache;
 
    static constexpr bool cachingEnabled = true;
 
    using LocalView = typename Traits::template LocalView<ThisType, cachingEnabled>;
 
    // The constructor
    CCTpfaGridFluxVariablesCache(const Problem& problem) : problemPtr_(&problem) {}
 
    // When global caching is enabled, precompute transmissibilities and stencils for all the scv faces
    template<class GridGeometry, class GridVolumeVariables, class SolutionVector>
    void update(const GridGeometry& gridGeometry,
                const GridVolumeVariables& gridVolVars,
                const SolutionVector& sol,
                bool forceUpdate = false)
    {
        // only do the update if fluxes are solution dependent or if update is forced
        if (FluxVariablesCacheFiller::isSolDependent || forceUpdate)
        {
            // instantiate helper class to fill the caches
            FluxVariablesCacheFiller filler(problem());
 
            fluxVarsCache_.resize(gridGeometry.numScvf());
 
            Dumux::parallelFor(gridGeometry.gridView().size(0), [&](const std::size_t eIdx)
            {
                // Prepare the geometries within the elements of the stencil
                const auto element = gridGeometry.element(eIdx);
                const auto fvGeometry = localView(gridGeometry).bind(element);
                const auto elemVolVars = localView(gridVolVars).bind(element, fvGeometry, sol);
 
                for (auto&& scvf : scvfs(fvGeometry))
                {
                    filler.fill(*this, fluxVarsCache_[scvf.index()], element, fvGeometry, elemVolVars, scvf, forceUpdate);
                }
            });
        }
    }
 
    template<class FVElementGeometry, class ElementVolumeVariables>
    void updateElement(const typename FVElementGeometry::GridGeometry::GridView::template Codim<0>::Entity& element,
                       const FVElementGeometry& fvGeometry,
                       const ElementVolumeVariables& elemVolVars)
    {
        if (FluxVariablesCacheFiller::isSolDependent)
        {
            const auto globalI = fvGeometry.gridGeometry().elementMapper().index(element);
 
            // instantiate filler class
            FluxVariablesCacheFiller filler(problem());
 
            // update the caches inside this element
            for (const auto& scvf : scvfs(fvGeometry))
                filler.fill(*this, fluxVarsCache_[scvf.index()], element, fvGeometry, elemVolVars, scvf);
 
            // update the caches in the neighbors
            for (const auto& dataJ : fvGeometry.gridGeometry().connectivityMap()[globalI])
            {
                const auto elementJ = fvGeometry.gridGeometry().element(dataJ.globalJ);
                for (const auto scvfIdxJ : dataJ.scvfsJ)
                {
                    const auto& scvfJ = fvGeometry.scvf(scvfIdxJ);
                    filler.fill(*this, fluxVarsCache_[scvfJ.index()], elementJ, fvGeometry, elemVolVars, scvfJ);
                }
            }
        }
    }
 
    // access operators in the case of caching
    template<class SubControlVolumeFace>
    const FluxVariablesCache& operator [](const SubControlVolumeFace& scvf) const
    { return fluxVarsCache_[scvf.index()]; }
 
    template<class SubControlVolumeFace>
    FluxVariablesCache& operator [](const SubControlVolumeFace& scvf)
    { return fluxVarsCache_[scvf.index()]; }
 
    const Problem& problem() const
    { return *problemPtr_; }
 
private:
    const Problem* problemPtr_;
 
    std::vector<FluxVariablesCache> fluxVarsCache_;
    std::vector<std::size_t> globalScvfIndices_;
};
 
template<class P, class FVC, class FVCF, class TheTraits>
class CCTpfaGridFluxVariablesCache<P, FVC, FVCF, false, TheTraits>
{
    using Problem = typename TheTraits::Problem;
    using ThisType = CCTpfaGridFluxVariablesCache<P, FVC, FVCF, false, TheTraits>;
 
    using FluxVariablesCacheFiller = typename TheTraits::FluxVariablesCacheFiller;
public:
    using Traits = TheTraits;
 
    using FluxVariablesCache = typename Traits::FluxVariablesCache;
 
    static constexpr bool cachingEnabled = false;
 
    using LocalView = typename Traits::template LocalView<ThisType, cachingEnabled>;
 
    // The constructor
    CCTpfaGridFluxVariablesCache(const Problem& problem) : problemPtr_(&problem) {}
 
    template<class GridGeometry, class GridVolumeVariables, class SolutionVector>
    void update(const GridGeometry& gridGeometry,
                const GridVolumeVariables& gridVolVars,
                const SolutionVector& sol,
                bool forceUpdate = false) {}
 
    template<class FVElementGeometry, class ElementVolumeVariables>
    void updateElement(const typename FVElementGeometry::GridGeometry::GridView::template Codim<0>::Entity& element,
                       const FVElementGeometry& fvGeometry,
                       const ElementVolumeVariables& elemVolVars) {}
 
    const Problem& problem() const
    { return *problemPtr_; }
 
private:
    const Problem* problemPtr_;
};
 
} // end namespace Dumux
 
#endif