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| 1 | // -*- mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- | ||
| 2 | // vi: set et ts=4 sw=4 sts=4: | ||
| 3 | // | ||
| 4 | // SPDX-FileCopyrightInfo: Copyright © DuMux Project contributors, see AUTHORS.md in root folder | ||
| 5 | // SPDX-License-Identifier: GPL-3.0-or-later | ||
| 6 | // | ||
| 7 | /*! | ||
| 8 | * \file | ||
| 9 | * \ingroup Discretization | ||
| 10 | * \copydoc Dumux::WallDistance | ||
| 11 | */ | ||
| 12 | #ifndef DUMUX_DISCRETIZATION_WALL_DISTANCE_HH | ||
| 13 | #define DUMUX_DISCRETIZATION_WALL_DISTANCE_HH | ||
| 14 | |||
| 15 | #include <vector> | ||
| 16 | |||
| 17 | #include <dune/common/parallel/mpihelper.hh> | ||
| 18 | #include <dune/common/shared_ptr.hh> | ||
| 19 | #include <dune/common/reservedvector.hh> | ||
| 20 | #include <dune/grid/common/partitionset.hh> | ||
| 21 | |||
| 22 | #include <dumux/common/tag.hh> | ||
| 23 | #include <dumux/common/indextraits.hh> | ||
| 24 | #include <dumux/parallel/parallel_for.hh> | ||
| 25 | #include <dumux/geometry/distancefield.hh> | ||
| 26 | |||
| 27 | namespace Dumux { | ||
| 28 | |||
| 29 | /*! | ||
| 30 | * \ingroup Discretization | ||
| 31 | * \brief Class to calculate the wall distance at every element or vertex of a grid | ||
| 32 | * \tparam GridGeometry The grid geometry. | ||
| 33 | * \tparam DistanceField The type of distance field to use (parameterized with the geometry type) | ||
| 34 | */ | ||
| 35 | template<class GridGeometry, template<class> class DistanceField = AABBDistanceField> | ||
| 36 | class WallDistance | ||
| 37 | { | ||
| 38 | using GridView = typename GridGeometry::GridView; | ||
| 39 | using GridIndexType = typename IndexTraits<GridView>::GridIndex; | ||
| 40 | using SubControlVolumeFace = typename GridGeometry::SubControlVolumeFace; | ||
| 41 | using FVElementGeometry = typename GridGeometry::LocalView; | ||
| 42 | using Element = typename GridGeometry::GridView::template Codim<0>::Entity; | ||
| 43 | using Scalar = typename GridView::Grid::ctype; | ||
| 44 | using GlobalPosition = typename SubControlVolumeFace::GlobalPosition; | ||
| 45 | |||
| 46 | static constexpr int dim = GridView::dimension; | ||
| 47 | static constexpr int dimWorld = GridView::dimensionworld; | ||
| 48 | static_assert(dim == dimWorld, "Wall distances cannot be computed for embedded surface or network domains."); | ||
| 49 | |||
| 50 | using CornerStorage = Dune::ReservedVector<GlobalPosition, (1<<(GridView::dimension-1))>; | ||
| 51 | |||
| 52 | // We use a simplified geometry type here which allows much easier MPI communication | ||
| 53 | // for parallel runs compared to the Dune geometry types (due to fixed-size storage). | ||
| 54 | // This type only implements a minimal part of the Geometry interface. | ||
| 55 | struct SimpleGeometry | ||
| 56 | { | ||
| 57 | 19200 | SimpleGeometry() = default; | |
| 58 | 42688 | SimpleGeometry(CornerStorage&& corners) | |
| 59 | 42688 | : corners_(std::move(corners)) | |
| 60 | 42688 | , center_(0.0) | |
| 61 | { | ||
| 62 |
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204344 | for (int i = 0; i < corners_.size(); ++i) |
| 63 | 484968 | center_ += corners_[i]; | |
| 64 | 42688 | center_ /= corners_.size(); | |
| 65 | 42688 | } | |
| 66 | |||
| 67 | using GlobalCoordinate = GlobalPosition; | ||
| 68 | using ctype = typename GlobalCoordinate::value_type; | ||
| 69 | static constexpr int coorddimension = GridView::dimensionworld; | ||
| 70 | static constexpr int mydimension = GridView::dimension-1; | ||
| 71 | |||
| 72 | std::size_t corners() const | ||
| 73 |
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835065 | { return corners_.size(); } |
| 74 | |||
| 75 | const auto& corner(int i) const | ||
| 76 | 4013810 | { return corners_[i]; } | |
| 77 | |||
| 78 | const auto& center() const | ||
| 79 | { return center_; } | ||
| 80 | |||
| 81 | private: | ||
| 82 | CornerStorage corners_; | ||
| 83 | GlobalCoordinate center_; | ||
| 84 | }; | ||
| 85 | |||
| 86 | 80936 | struct WallDataImpl | |
| 87 | { | ||
| 88 | GridIndexType eIdx; | ||
| 89 | GridIndexType scvfIdx; | ||
| 90 | GlobalPosition scvfOuterNormal; | ||
| 91 | int rank; // for parallel runs | ||
| 92 | }; | ||
| 93 | |||
| 94 | struct ElementCenters {}; | ||
| 95 | struct VertexCenters {}; | ||
| 96 | |||
| 97 | public: | ||
| 98 | static constexpr auto atElementCenters = Utility::Tag<ElementCenters>{}; | ||
| 99 | static constexpr auto atVertexCenters = Utility::Tag<VertexCenters>{}; | ||
| 100 | using WallData = WallDataImpl; | ||
| 101 | |||
| 102 | /*! | ||
| 103 | * \brief Constructs a new wall distance object | ||
| 104 | * \param gridGeometry the grid geometry of the grid | ||
| 105 | * \param tag the policy (either WallDistance::atElementCenters or WallDistance::atVertexCenters) | ||
| 106 | * \param select a selection functor taking an scvf and returning bool signifying whether the scvfs is part of the wall | ||
| 107 | */ | ||
| 108 | template<class LocationTag, class ScvfSelectionFunctor> | ||
| 109 | 110 | WallDistance(std::shared_ptr<const GridGeometry> gridGeometry, LocationTag tag, const ScvfSelectionFunctor& select) | |
| 110 |
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330 | : gridGeometry_(gridGeometry) |
| 111 | { | ||
| 112 |
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110 | initializeWallDistance_(select, tag); |
| 113 | 110 | } | |
| 114 | |||
| 115 | /*! | ||
| 116 | * \brief Constructs a new wall distance object | ||
| 117 | * \param gridGeometry the grid geometry of the grid | ||
| 118 | * \param tag the policy (either WallDistance::atElementCenters or WallDistance::atVertexCenters) | ||
| 119 | * \note selects all boundary scvfs as wall faces | ||
| 120 | */ | ||
| 121 | template<class LocationTag> | ||
| 122 | 20 | WallDistance(std::shared_ptr<const GridGeometry> gridGeometry, LocationTag tag) | |
| 123 |
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40 | : WallDistance(gridGeometry, tag, [](const FVElementGeometry& fvGeometry, const SubControlVolumeFace& scvf) { return true; }) {} |
| 124 | |||
| 125 | //! caller has to make sure the lifetime of grid geometry exceeds the lifetime of wall distance | ||
| 126 | template<class LocationTag, class ScvfSelectionFunctor> | ||
| 127 | 90 | WallDistance(const GridGeometry& gridGeometry, LocationTag tag, const ScvfSelectionFunctor& select) | |
| 128 |
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180 | : WallDistance(Dune::stackobject_to_shared_ptr(gridGeometry), tag, select) {} |
| 129 | |||
| 130 | //! caller has to make sure the lifetime of grid geometry exceeds the lifetime of wall distance | ||
| 131 | template<class LocationTag> | ||
| 132 | 20 | WallDistance(const GridGeometry& gridGeometry, LocationTag tag) | |
| 133 |
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40 | : WallDistance(Dune::stackobject_to_shared_ptr(gridGeometry), tag) {} |
| 134 | |||
| 135 | /*! | ||
| 136 | * \brief Returns a vector storing the distance from each DOF location to the nearest wall. | ||
| 137 | * For the atElementCenter policy, this is the distance from the element center to the nearest wall. | ||
| 138 | * For the atVertexCenter policy, this is the distance from the vertex to the nearest wall. | ||
| 139 | */ | ||
| 140 | const std::vector<Scalar>& wallDistance() const | ||
| 141 | { return distance_; } | ||
| 142 | |||
| 143 | /*! | ||
| 144 | * \brief Returns a vector storing additional information about the nearest scvf on the wall (element index and scvf index). | ||
| 145 | * For the atElementCenter policy, this information is given for each element | ||
| 146 | * For the atVertexCenter policy, this information is given for each vertex. | ||
| 147 | */ | ||
| 148 | const std::vector<WallData>& wallData() const | ||
| 149 | { return wallData_; } | ||
| 150 | |||
| 151 | private: | ||
| 152 | /*! | ||
| 153 | * \brief Perform the actual calculation of wall distances. | ||
| 154 | * \param considerFace Function object (e.g. a lambda) that determines whether a certain scvf shall be considered | ||
| 155 | * for the calculation of wall distances. | ||
| 156 | * \param loc Location a which the distance to the wall shall be calculated (elementCenter or vertex) | ||
| 157 | */ | ||
| 158 | template<class ConsiderFaceFunction, class LocationTag> | ||
| 159 | 110 | void initializeWallDistance_(const ConsiderFaceFunction& considerFace, LocationTag loc) | |
| 160 | { | ||
| 161 | 110 | const std::size_t numSamplingPoints = (loc == atElementCenters) | |
| 162 | 310 | ? gridGeometry_->gridView().size(0) | |
| 163 | 60 | : gridGeometry_->gridView().size(dim); | |
| 164 | // Reset the containers. | ||
| 165 | 110 | wallData_.resize(numSamplingPoints); | |
| 166 | 110 | distance_.resize(numSamplingPoints, std::numeric_limits<Scalar>::max()); | |
| 167 | |||
| 168 |
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110 | std::vector<SimpleGeometry> wallGeometries; |
| 169 |
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250 | wallGeometries.reserve(gridGeometry_->numBoundaryScvf()); |
| 170 | |||
| 171 |
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220 | std::vector<WallData> tempWallData; |
| 172 |
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250 | tempWallData.reserve(gridGeometry_->numBoundaryScvf()); |
| 173 | |||
| 174 | // Loop over all elements: find all wall scvfs. | ||
| 175 |
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268 | auto fvGeometry = localView(*gridGeometry_); |
| 176 |
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101466 | for (const auto& element : elements(gridGeometry_->gridView(), Dune::Partitions::interior)) |
| 177 | { | ||
| 178 |
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84896 | fvGeometry.bindElement(element); |
| 179 |
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168792 | if (!fvGeometry.hasBoundaryScvf()) |
| 180 | continue; | ||
| 181 | |||
| 182 |
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65346 | const auto eIdx = gridGeometry_->elementMapper().index(element); |
| 183 | |||
| 184 |
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203068 | for (const auto& scvf : scvfs(fvGeometry)) |
| 185 | { | ||
| 186 |
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159504 | if (scvf.boundary() && considerFace(fvGeometry, scvf)) |
| 187 | { | ||
| 188 |
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50028 | const auto& geo = fvGeometry.geometry(scvf); |
| 189 | 42788 | CornerStorage corners; | |
| 190 |
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366100 | for (int i = 0; i < geo.corners(); ++i) |
| 191 | 183136 | corners.push_back(geo.corner(i)); | |
| 192 | |||
| 193 |
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42788 | wallGeometries.emplace_back(std::move(corners)); |
| 194 |
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42788 | tempWallData.push_back(WallData{ |
| 195 |
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128364 | eIdx, scvf.index(), scvf.unitOuterNormal(), gridGeometry_->gridView().comm().rank() |
| 196 | }); | ||
| 197 | } | ||
| 198 | } | ||
| 199 | } | ||
| 200 | |||
| 201 | #if HAVE_MPI | ||
| 202 | // Handle parallel runs. We need to prepare a global vector of wall geometries, | ||
| 203 | // containing the wall geometries of each process in order to get a correct distance field. | ||
| 204 |
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330 | const bool isParallel = gridGeometry_->gridView().comm().size() > 1; |
| 205 |
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220 | std::vector<SimpleGeometry> globalWallGeometries; |
| 206 |
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220 | std::vector<WallData> globalTempWallData; |
| 207 |
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260 | const auto distanceField = [&] |
| 208 | { | ||
| 209 | 70 | if (isParallel) | |
| 210 | { | ||
| 211 |
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16 | const auto& communication = gridGeometry_->gridView().comm(); |
| 212 | 16 | const int totalNumberOfBoundaryGeometries = communication.sum(wallGeometries.size()); | |
| 213 | 8 | globalWallGeometries.resize(totalNumberOfBoundaryGeometries); | |
| 214 | 8 | globalTempWallData.resize(totalNumberOfBoundaryGeometries); | |
| 215 | |||
| 216 | // prepare a displacement vector | ||
| 217 | 32 | std::vector<int> numGeosPerProcLocal{static_cast<int>(wallGeometries.size())}; | |
| 218 |
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32 | std::vector<int> numGeosPerProcGlobal(communication.size()); |
| 219 |
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24 | communication.allgather(numGeosPerProcLocal.data(), 1, numGeosPerProcGlobal.data()); |
| 220 | |||
| 221 |
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40 | std::vector<int> disp(communication.size(), 0); |
| 222 | 8 | disp[1] = numGeosPerProcGlobal[0]; | |
| 223 |
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8 | for (int i = 2; i < numGeosPerProcGlobal.size(); ++i) |
| 224 | ✗ | disp[i] = disp[i-1] + numGeosPerProcGlobal[i-1]; | |
| 225 | |||
| 226 | // concatenate the wall geometries and temp scvf data of each process into a global vector | ||
| 227 |
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48 | communication.allgatherv( |
| 228 | wallGeometries.data(), | ||
| 229 | wallGeometries.size(), | ||
| 230 | globalWallGeometries.data(), | ||
| 231 | numGeosPerProcGlobal.data(), | ||
| 232 | disp.data() | ||
| 233 | ); | ||
| 234 | |||
| 235 |
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40 | communication.allgatherv( |
| 236 |
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8 | tempWallData.data(), |
| 237 | tempWallData.size(), | ||
| 238 | globalTempWallData.data(), | ||
| 239 | numGeosPerProcGlobal.data(), | ||
| 240 | disp.data() | ||
| 241 | ); | ||
| 242 | |||
| 243 | // pass the global vector of wall geometries to the distance field | ||
| 244 |
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8 | return DistanceField<SimpleGeometry>(globalWallGeometries); |
| 245 | } | ||
| 246 | else | ||
| 247 | 62 | return DistanceField<SimpleGeometry>(wallGeometries); | |
| 248 |
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70 | }(); |
| 249 | #else | ||
| 250 | const DistanceField<SimpleGeometry> distanceField(wallGeometries); | ||
| 251 | #endif | ||
| 252 | |||
| 253 | // compute sampling points | ||
| 254 |
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440 | std::vector<GlobalPosition> points(numSamplingPoints); |
| 255 | if (loc == atElementCenters) | ||
| 256 |
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93726 | for (const auto& element : elements(gridGeometry_->gridView())) |
| 257 |
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83928 | points[gridGeometry_->elementMapper().index(element)] = element.geometry().center(); |
| 258 | else | ||
| 259 |
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22064 | for (const auto& vertex : vertices(gridGeometry_->gridView())) |
| 260 |
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14872 | points[gridGeometry_->vertexMapper().index(vertex)] = vertex.geometry().corner(0); |
| 261 | |||
| 262 | // get the actual distances (this is the most expensive part) | ||
| 263 | if (loc == atElementCenters) | ||
| 264 | { | ||
| 265 | 106618 | const auto kernel = [&](std::size_t eIdx){ | |
| 266 |
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53264 | const auto [d, idx] = distanceField.distanceAndIndex(points[eIdx]); |
| 267 |
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26632 | distance_[eIdx] = d; |
| 268 | #if HAVE_MPI | ||
| 269 |
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26632 | wallData_[eIdx] = isParallel ? globalTempWallData[idx] : tempWallData[idx]; |
| 270 | #else | ||
| 271 | wallData_[eIdx] = tempWallData[idx]; | ||
| 272 | #endif | ||
| 273 | }; | ||
| 274 | |||
| 275 |
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90 | runKernel_(numSamplingPoints, kernel); |
| 276 | } | ||
| 277 | else | ||
| 278 | { | ||
| 279 | 29764 | const auto kernel = [&](std::size_t vIdx){ | |
| 280 |
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14872 | const auto [d, idx] = distanceField.distanceAndIndex(points[vIdx]); |
| 281 |
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7436 | distance_[vIdx] = d; |
| 282 | #if HAVE_MPI | ||
| 283 |
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7436 | wallData_[vIdx] = isParallel ? globalTempWallData[idx] : tempWallData[idx]; |
| 284 | #else | ||
| 285 | wallData_[vIdx] = tempWallData[idx]; | ||
| 286 | #endif | ||
| 287 | }; | ||
| 288 | |||
| 289 |
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20 | runKernel_(numSamplingPoints, kernel); |
| 290 | } | ||
| 291 | 110 | } | |
| 292 | |||
| 293 | template<class Kernel> | ||
| 294 | ✗ | void runKernel_(std::size_t size, const Kernel& kernel) | |
| 295 | { | ||
| 296 | // parallelize, if we have enough work (enough evaluation points) | ||
| 297 | ✗ | if (size > 10000) | |
| 298 | ✗ | Dumux::parallelFor(size, [&](const std::size_t i){ kernel(i); }); | |
| 299 | else | ||
| 300 | ✗ | for (std::size_t i = 0; i < size; ++i) kernel(i); | |
| 301 | ✗ | } | |
| 302 | |||
| 303 | std::vector<Scalar> distance_; | ||
| 304 | std::vector<WallData> wallData_; | ||
| 305 | std::shared_ptr<const GridGeometry> gridGeometry_; | ||
| 306 | }; | ||
| 307 | |||
| 308 | } // end namespace Dumux | ||
| 309 | |||
| 310 | #endif | ||
| 311 |