discretization/cvfe/hybrid/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-FileCopyrightText: Copyright © DuMux Project contributors, see AUTHORS.md in root folder
// SPDX-License-Identifier: GPL-3.0-or-later
//
#ifndef DUMUX_DISCRETIZATION_HYBRID_CVFE_GRID_FLUXVARSCACHE_HH
#define DUMUX_DISCRETIZATION_HYBRID_CVFE_GRID_FLUXVARSCACHE_HH
 
#include <memory>
#include <ranges>
#include <unordered_map>
 
#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/cvfe/hybrid/elementfluxvariablescache.hh>
#include <dumux/discretization/cvfe/quadraturerules.hh>
 
namespace Dumux {
 
template<class P, class FVC>
struct HybridCVFEDefaultGridFVCTraits
{
    using Problem = P;
    using FluxVariablesCache = FVC;
 
    template<class GridFluxVariablesCache, bool cachingEnabled>
    using LocalView = HybridCVFEElementFluxVariablesCache<GridFluxVariablesCache, cachingEnabled>;
};
 
template<class Problem,
         class FluxVariablesCache,
         bool cachingEnabled = false,
         class Traits = HybridCVFEDefaultGridFVCTraits<Problem, FluxVariablesCache>>
class HybridCVFEGridFluxVariablesCache;
 
template<class P, class FVC, class Traits>
class HybridCVFEGridFluxVariablesCache<P, FVC, true, Traits>
{
    using Problem = typename Traits::Problem;
    using ThisType = HybridCVFEGridFluxVariablesCache<P, FVC, true, Traits>;
 
public:
    using FluxVariablesCache = typename Traits::FluxVariablesCache;
 
    static constexpr bool cachingEnabled = true;
 
    using LocalView = typename Traits::template LocalView<ThisType, cachingEnabled>;
 
    HybridCVFEGridFluxVariablesCache(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)
    {
        // Here, we do not do anything unless it is a forced update
        if (forceUpdate)
        {
            fluxVarsCache_.resize(gridGeometry.gridView().size(0));
            scvfOffset_.resize(gridGeometry.gridView().size(0));
            elementCache_.resize(gridGeometry.gridView().size(0));
            boundaryFaceCache_.resize(gridGeometry.gridView().size(0));
            Dumux::parallelFor(gridGeometry.gridView().size(0), [&, &problem = problem()](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);
 
                // Build offset vector and resize flat cache
                scvfOffset_[eIdx].resize(fvGeometry.numScvf() + 1, 0);
                for (const auto& scvf : scvfs(fvGeometry))
                {
                    const auto numQps = std::ranges::size(CVFE::quadratureRule(fvGeometry, scvf));
                    scvfOffset_[eIdx][scvf.index() + 1] = numQps;
                }
                for (std::size_t i = 2; i < scvfOffset_[eIdx].size(); ++i)
                    scvfOffset_[eIdx][i] += scvfOffset_[eIdx][i-1];
 
                fluxVarsCache_[eIdx].resize(scvfOffset_[eIdx].back());
                for (const auto& scvf : scvfs(fvGeometry))
                {
                    for (const auto& qpData : CVFE::quadratureRule(fvGeometry, scvf))
                        cache(eIdx, qpData.ipData().scvfIndex(), qpData.ipData().qpIndex()).update(problem,
                                                                                                   element,
                                                                                                   fvGeometry,
                                                                                                   elemVolVars,
                                                                                                   qpData.ipData());
                }
 
                // Resize element cache based on element quadrature rule
                const auto elemQuadRule = CVFE::quadratureRule(fvGeometry, element);
                elementCache_[eIdx].resize(std::ranges::size(elemQuadRule));
                for (const auto& qpData : elemQuadRule)
                    elementCache_[eIdx][qpData.ipData().qpIndex()].update(problem, element, fvGeometry, elemVolVars, qpData.ipData());
 
                // Rebuild boundary face cache for this element
                if (!boundaryFaceCache_[eIdx])
                    boundaryFaceCache_[eIdx] = std::make_unique<std::unordered_map<int, std::vector<FluxVariablesCache>>>();
                else
                    boundaryFaceCache_[eIdx]->clear();
 
                for (const auto& boundaryFace : boundaryFaces(fvGeometry))
                {
                    const auto quadRule = CVFE::quadratureRule(fvGeometry, boundaryFace);
                    const auto bfIdx = boundaryFace.index();
                    (*boundaryFaceCache_[eIdx])[bfIdx].resize(std::ranges::size(quadRule));
 
                    for (const auto& qpData : quadRule)
                        (*boundaryFaceCache_[eIdx])[bfIdx][qpData.ipData().qpIndex()].update(problem,
                                                                                             element,
                                                                                             fvGeometry,
                                                                                             elemVolVars,
                                                                                             qpData.ipData());
                }
            });
        }
    }
 
    template<class FVElementGeometry, class ElementVolumeVariables>
    void updateElement(const typename FVElementGeometry::Element& element,
                       const FVElementGeometry& fvGeometry,
                       const ElementVolumeVariables& elemVolVars)
    {
        if constexpr (FluxVariablesCache::isSolDependent)
        {
            const auto eIdx = fvGeometry.gridGeometry().elementMapper().index(element);
 
            // Build offset vector and resize flat cache
            scvfOffset_[eIdx].resize(fvGeometry.numScvf() + 1, 0);
            for (const auto& scvf : scvfs(fvGeometry))
            {
                const auto numQps = std::ranges::size(CVFE::quadratureRule(fvGeometry, scvf));
                scvfOffset_[eIdx][scvf.index() + 1] = numQps;
            }
            for (std::size_t i = 2; i < scvfOffset_[eIdx].size(); ++i)
                scvfOffset_[eIdx][i] += scvfOffset_[eIdx][i-1];
 
            fluxVarsCache_[eIdx].resize(scvfOffset_[eIdx].back());
            for (const auto& scvf : scvfs(fvGeometry))
            {
                for (const auto& qpData : CVFE::quadratureRule(fvGeometry, scvf))
                    cache(eIdx, qpData.ipData().scvfIndex(), qpData.ipData().qpIndex()).update(problem(),
                                                                                               element,
                                                                                               fvGeometry,
                                                                                               elemVolVars,
                                                                                               qpData.ipData());
            }
 
            // Resize element cache based on element quadrature rule
            const auto elemQuadRule = CVFE::quadratureRule(fvGeometry, element);
            elementCache_[eIdx].resize(std::ranges::size(elemQuadRule));
            for (const auto& qpData : elemQuadRule)
                elementCache_[eIdx][qpData.ipData().qpIndex()].update(problem(), element, fvGeometry, elemVolVars, qpData.ipData());
 
            // Rebuild boundary face cache for this element
            if (!boundaryFaceCache_[eIdx])
                boundaryFaceCache_[eIdx] = std::make_unique<std::unordered_map<int, std::vector<FluxVariablesCache>>>();
            else
                boundaryFaceCache_[eIdx]->clear();
 
            for (const auto& boundaryFace : boundaryFaces(fvGeometry))
            {
                const auto quadRule = CVFE::quadratureRule(fvGeometry, boundaryFace);
                const auto bfIdx = boundaryFace.index();
                (*boundaryFaceCache_[eIdx])[bfIdx].resize(std::ranges::size(quadRule));
 
                for (const auto& qpData : quadRule)
                    (*boundaryFaceCache_[eIdx])[bfIdx][qpData.ipData().qpIndex()].update(problem(),
                                                                                         element,
                                                                                         fvGeometry,
                                                                                         elemVolVars,
                                                                                         qpData.ipData());
            }
        }
    }
 
    const Problem& problem() const
    { return *problemPtr_; }
 
    // access operator
    const FluxVariablesCache& cache(std::size_t eIdx, std::size_t scvfIdx, std::size_t qpIdx) const
    { return fluxVarsCache_[eIdx][scvfOffset_[eIdx][scvfIdx] + qpIdx]; }
 
    // access operator
    FluxVariablesCache& cache(std::size_t eIdx, std::size_t scvfIdx, std::size_t qpIdx)
    { return fluxVarsCache_[eIdx][scvfOffset_[eIdx][scvfIdx] + qpIdx]; }
 
    // access operator
    const FluxVariablesCache& elementCache(std::size_t eIdx, std::size_t qpIdx) const { return elementCache_[eIdx][qpIdx]; }
    FluxVariablesCache& elementCache(std::size_t eIdx, std::size_t qpIdx) { return elementCache_[eIdx][qpIdx]; }
 
    // access operator for boundary face cache
    FluxVariablesCache& boundaryFaceCache(std::size_t eIdx, int bfIdx, std::size_t qpIdx) { return (*boundaryFaceCache_[eIdx])[bfIdx][qpIdx]; }
    const FluxVariablesCache& boundaryFaceCache(std::size_t eIdx, int bfIdx, std::size_t qpIdx) const { return (*boundaryFaceCache_[eIdx]).at(bfIdx)[qpIdx]; }
 
private:
    // currently bound element
    const Problem* problemPtr_;
    std::vector<std::vector<FluxVariablesCache>> fluxVarsCache_; 
    std::vector<std::vector<std::size_t>> scvfOffset_; 
    std::vector<std::vector<FluxVariablesCache>> elementCache_; 
    std::vector<std::unique_ptr<std::unordered_map<int, std::vector<FluxVariablesCache>>>> boundaryFaceCache_; 
};
 
template<class P, class FVC, class Traits>
class HybridCVFEGridFluxVariablesCache<P, FVC, false, Traits>
{
    using Problem = typename Traits::Problem;
    using ThisType = HybridCVFEGridFluxVariablesCache<P, FVC, false, Traits>;
 
public:
    using FluxVariablesCache = typename Traits::FluxVariablesCache;
 
    static constexpr bool cachingEnabled = false;
 
    using LocalView = typename Traits::template LocalView<ThisType, cachingEnabled>;
 
    HybridCVFEGridFluxVariablesCache(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) {}
 
    const Problem& problem() const
    { return *problemPtr_; }
 
private:
    const Problem* problemPtr_;
};
 
} // end namespace Dumux
 
#endif