XsimはFoundation版のOpenFOAMでの設定であり、ESI版のOpenFOAMで計算させたい場合はXsimでエクスポートした設定ファイルでは設定ファイルの記述方法が、Foundation版とESI版では微妙に異なるため計算エラーが出ます。
ただ、全く参考にできないのかというとそうではなく、Xsimでエクスポートした設定ファイルを参考にESI版に書き換えるのは割と簡単にできます。
本記事は熱流体の非定常解析を例にどれくらいFoundation版とESI版とで異なるのかを見ています。
おそらくを変更するだけで良いだろうということがわかりました。
- 特徴線の設定
- snappyHexMeshの設定
- 計算制御の設定
※Foundation版も最新版だとかなり変更があるようですので、比較的ESI版との差異が少ない古いバージョンOpenFOAM10のFoundation版をエクスポートしました。
モデル作成
- FreeCADでモデル作成→stlファイルをエクスポート
- OpenFOAMの設定はXsimで行う
以上の手順は以下のスライドにまとめています。
途中FreeCADからstlファイルを出力するPythonスクリプトはこちらをご参考ください。
この動画では面を分割する方法もあります。
あわせて読みたい
以下はFoundation版（Xsim）とESI版の比較になります。
Foundation版も最新版だとかなり変更があるようですので、比較的ESI版との差異が少ない古いバージョンOpenFOAM10のFoundation版をエクスポートしました。
Foundation版：OpenFOAM10
ESI版：OpenFOAM v2412
ベースメッシュ：blockMesh
system/blockMeshDict
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FoamFile { version 2.0; format ascii; class dictionary; location "system"; object blockMeshDict; } vertices ( (-0.25 -0.25 -0.25) (3.35 -0.25 -0.25) (3.35 3.25 -0.25) (-0.25 3.25 -0.25) (-0.25 -0.25 2.75) (3.35 -0.25 2.75) (3.35 3.25 2.75) (-0.25 3.25 2.75) ); blocks ( hex (0 1 2 3 4 5 6 7) (24 23 20) simpleGrading (1 1 1) ); defaultPatch { type patch; } boundary (); |
これをESI版に変更
system/blockMeshDict
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FoamFile { version 2.0; format ascii; class dictionary; object blockMeshDict; } scale 1; vertices ( (-0.25 -0.25 -0.25) (3.35 -0.25 -0.25) (3.35 3.25 -0.25) (-0.25 3.25 -0.25) (-0.25 -0.25 2.75) (3.35 -0.25 2.75) (3.35 3.25 2.75) (-0.25 3.25 2.75) ); blocks ( hex (0 1 2 3 4 5 6 7) (24 23 20) simpleGrading (1 1 1) ); edges ( ); defaultPatch { type patch; } boundary (); mergePatchPairs ( ); |
ご覧の通りほとんど同じです。
特徴線の抽出：surfaceFeaturesDict
これが一番変わっているかもしれません。
そもそもファイル名が違います。
system/surfaceFeaturesDict
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FoamFile { version 2.0; format ascii; class dictionary; location "system"; object surfaceFeaturesDict; } surfaces ( "model.stl" ); includedAngle 165.0 subsetFeatures { nonManifoldEdges no; openEdges yes; } writeObj yes; |
Foundation版の実行コマンドはsurfaceFeaturesです。
これをESI版に変更
system/surfaceFeatureExtractDict
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FoamFile { version 2.0; format ascii; class dictionary; object surfaceFeatureExtractDict; } model.stl { // How to obtain raw features (extractFromFile || extractFromSurface) extractionMethod extractFromSurface; // Mark edges whose adjacent surface normals are at an angle less // than includedAngle as features // - 0 : selects no edges // - 180: selects all edges includedAngle 150; subsetFeatures { // Keep nonManifold edges (edges with >2 connected faces) nonManifoldEdges no; // Keep open edges (edges with 1 connected face) openEdges yes; } // Write options // Write features to obj format for postprocessing writeObj yes; } |
ESI版の実行コマンドはsurfaceFeatureExtractです。
テキストの設定も実行コマンドも異なるので注意。
メッシュ作成：snappyHexMeshDict
こちらはそこまで変わっていません。
system/surfaceFeaturesDict
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FoamFile { version 2.0; format ascii; class dictionary; location "system"; object snappyHexMeshDict; } castellatedMesh true; snap true; addLayers true; geometry { model.stl { type triSurfaceMesh; name model; regions { Outlet_press_2-4_3 { name Outlet_press_2-4_3; } Outlet_walls_2-4_3 { name Outlet_walls_2-4_3; } XMax_wall_2-4_3 { name XMax_wall_2-4_3; } XMin_wall_2-4_3 { name XMin_wall_2-4_3; } YMax_wall_2-4_3 { name YMax_wall_2-4_3; } YMin_wall_2-4_3 { name YMin_wall_2-4_3; } ZMax_wall_2-4_3 { name ZMax_wall_2-4_3; } ZMin_wall_2-4_3 { name ZMin_wall_2-4_3; } airInlet_vol_2-4_3 { name airInlet_vol_2-4_3; } airOutlet_vol_2-4_3 { name airOutlet_vol_2-4_3; } airWalls_wall_2-4_3 { name airWalls_wall_2-4_3; } human_walls_2-4_3 { name human_walls_2-4_3; } } } } castellatedMeshControls { features ( { file "model.eMesh"; level 2; } ); refinementSurfaces { model { level (0 0); regions { Outlet_press_2-4_3 { level (0 0); patchInfo { type patch; } } Outlet_walls_2-4_3 { level (0 0); patchInfo { type wall; } } XMax_wall_2-4_3 { level (0 0); patchInfo { type wall; } } XMin_wall_2-4_3 { level (0 0); patchInfo { type wall; } } YMax_wall_2-4_3 { level (0 0); patchInfo { type wall; } } YMin_wall_2-4_3 { level (0 0); patchInfo { type wall; } } ZMax_wall_2-4_3 { level (0 0); patchInfo { type wall; } } ZMin_wall_2-4_3 { level (0 0); patchInfo { type wall; } } airInlet_vol_2-4_3 { level (0 0); patchInfo { type patch; } } airOutlet_vol_2-4_3 { level (0 0); patchInfo { type wall; } } airWalls_wall_2-4_3 { level (0 0); patchInfo { type wall; } } human_walls_2-4_3 { level (0 0); patchInfo { type wall; } } } } } refinementRegions {} locationInMesh (1.55 1.5 1.25); maxLocalCells 100000000; maxGlobalCells 100000000; minRefinementCells 1; nCellsBetweenLevels 3; resolveFeatureAngle 30; allowFreeStandingZoneFaces false; } snapControls { nSolveIter 30; nSmoothPatch 3; tolerance 4.0; nRelaxIter 5; nFeatureSnapIter 10; } addLayersControls { layers { Outlet_press_2-4_3 { nSurfaceLayers 3; } Outlet_walls_2-4_3 { nSurfaceLayers 3; } airInlet_vol_2-4_3 { nSurfaceLayers 3; } airOutlet_vol_2-4_3 { nSurfaceLayers 3; } human_walls_2-4_3 { nSurfaceLayers 3; } } relativeSizes true; expansionRatio 1.0; finalLayerThickness 0.3; minThickness 0.03; nGrow 1; featureAngle 60; nRelaxIter 5; nSmoothSurfaceNormals 1; nSmoothNormals 3; nSmoothThickness 10; maxFaceThicknessRatio 0.5; maxThicknessToMedialRatio 0.3; minMedianAxisAngle 130; nBufferCellsNoExtrude 0; nLayerIter 50; nRelaxedIter 20; } meshQualityControls { maxNonOrtho 65; maxBoundarySkewness 20; maxInternalSkewness 4; maxConcave 80; minFlatness 0.5; minVol 1.00E-13; minTetQuality -1e30; minArea -1; minTwist 0.05; minDeterminant 0.001; minFaceWeight 0.05; minVolRatio 0.01; minTriangleTwist -1; nSmoothScale 4; errorReduction 0.75; relaxed { maxNonOrtho 180; } } debug 0; mergeTolerance 1e-5; |
これをESI版に変更
system/snappyHexMeshDict
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FoamFile { version 2.0; format ascii; class dictionary; object snappyHexMeshDict; } // Which of the steps to run castellatedMesh true; snap true; addLayers true; // Geometry. Definition of all surfaces. All surfaces are of class // searchableSurface. // Surfaces are used // - to specify refinement for any mesh cell intersecting it // - to specify refinement for any mesh cell inside/outside/near // - to 'snap' the mesh boundary to the surface geometry { model.stl { type triSurfaceMesh; name model; regions { Outlet_press_2-4_3 { name Outlet_press_2-4_3; } Outlet_walls_2-4_3 { name Outlet_walls_2-4_3; } XMax_wall_2-4_3 { name XMax_wall_2-4_3; } XMin_wall_2-4_3 { name XMin_wall_2-4_3; } YMax_wall_2-4_3 { name YMax_wall_2-4_3; } YMin_wall_2-4_3 { name YMin_wall_2-4_3; } ZMax_wall_2-4_3 { name ZMax_wall_2-4_3; } ZMin_wall_2-4_3 { name ZMin_wall_2-4_3; } airInlet_vol_2-4_3 { name airInlet_vol_2-4_3; } airOutlet_vol_2-4_3 { name airOutlet_vol_2-4_3; } airWalls_wall_2-4_3 { name airWalls_wall_2-4_3; } human_walls_2-4_3 { name human_walls_2-4_3; } } } } // Settings for the castellatedMesh generation. castellatedMeshControls { // Refinement parameters // ~~~~~~~~~~~~~~~~~~~~~ // If local number of cells is >= maxLocalCells on any processor // switches from from refinement followed by balancing // (current method) to (weighted) balancing before refinement. maxLocalCells 100000; // Overall cell limit (approximately). Refinement will stop immediately // upon reaching this number so a refinement level might not complete. // Note that this is the number of cells before removing the part which // is not 'visible' from the keepPoint. The final number of cells might // actually be a lot less. maxGlobalCells 2000000; // The surface refinement loop might spend lots of iterations refining just a // few cells. This setting will cause refinement to stop if <= minimumRefine // are selected for refinement. Note: it will at least do one iteration // (unless the number of cells to refine is 0) minRefinementCells 10; // Allow a certain level of imbalance during refining // (since balancing is quite expensive) // Expressed as fraction of perfect balance (= overall number of cells / // nProcs). 0=balance always. maxLoadUnbalance 0.10; // Number of buffer layers between different levels. // 1 means normal 2:1 refinement restriction, larger means slower // refinement. nCellsBetweenLevels 3; // Explicit feature edge refinement // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // Specifies a level for any cell intersected by its edges. // This is a featureEdgeMesh, read from constant/triSurface for now. features ( { file "model.eMesh"; level 2; } ); // Surface based refinement // ~~~~~~~~~~~~~~~~~~~~~~~~ // Specifies two levels for every surface. The first is the minimum level, // every cell intersecting a surface gets refined up to the minimum level. // The second level is the maximum level. Cells that 'see' multiple // intersections where the intersections make an // angle > resolveFeatureAngle get refined up to the maximum level. refinementSurfaces { model { level (0 0); regions { Outlet_press_2-4_3 { level (0 0); patchInfo { type patch; } } Outlet_walls_2-4_3 { level (0 0); patchInfo { type wall; } } XMax_wall_2-4_3 { level (0 0); patchInfo { type wall; } } XMin_wall_2-4_3 { level (0 0); patchInfo { type wall; } } YMax_wall_2-4_3 { level (0 0); patchInfo { type wall; } } YMin_wall_2-4_3 { level (0 0); patchInfo { type wall; } } ZMax_wall_2-4_3 { level (0 0); patchInfo { type wall; } } ZMin_wall_2-4_3 { level (0 0); patchInfo { type wall; } } airInlet_vol_2-4_3 { level (0 0); patchInfo { type patch; } } airOutlet_vol_2-4_3 { level (0 0); patchInfo { type wall; } } airWalls_wall_2-4_3 { level (0 0); patchInfo { type wall; } } human_walls_2-4_3 { level (0 0); patchInfo { type wall; } } } } } // Resolve sharp angles resolveFeatureAngle 30; // Region-wise refinement // ~~~~~~~~~~~~~~~~~~~~~~ // Specifies refinement level for cells in relation to a surface. One of // three modes // - distance. 'levels' specifies per distance to the surface the // wanted refinement level. The distances need to be specified in // descending order. // - inside. 'levels' is only one entry and only the level is used. All // cells inside the surface get refined up to the level. The surface // needs to be closed for this to be possible. // - outside. Same but cells outside. refinementRegions { // refinementBox // { // mode inside; // levels ((1E15 4)); // } } // Mesh selection // ~~~~~~~~~~~~~~ // After refinement patches get added for all refinementSurfaces and // all cells intersecting the surfaces get put into these patches. The // section reachable from the locationInMesh is kept. // NOTE: This point should never be on a face, always inside a cell, even // after refinement. locationInMesh (1.55 1.5 1.25); // Whether any faceZones (as specified in the refinementSurfaces) // are only on the boundary of corresponding cellZones or also allow // free-standing zone faces. Not used if there are no faceZones. allowFreeStandingZoneFaces true; } // Settings for the snapping. snapControls { //- Number of patch smoothing iterations before finding correspondence // to surface nSmoothPatch 3; //- Relative distance for points to be attracted by surface feature point // or edge. True distance is this factor times local // maximum edge length. tolerance 2.0; //- Number of mesh displacement relaxation iterations. nSolveIter 30; //- Maximum number of snapping relaxation iterations. Should stop // before upon reaching a correct mesh. nRelaxIter 5; // Feature snapping //- Number of feature edge snapping iterations. // Leave out altogether to disable. nFeatureSnapIter 10; //- Detect (geometric only) features by sampling the surface // (default=false). implicitFeatureSnap false; //- Use castellatedMeshControls::features (default = true) explicitFeatureSnap true; //- Detect points on multiple surfaces (only for explicitFeatureSnap) multiRegionFeatureSnap false; } // Settings for the layer addition. addLayersControls { // Are the thickness parameters below relative to the undistorted // size of the refined cell outside layer (true) or absolute sizes (false). relativeSizes true; // Per final patch (so not geometry!) the layer information layers { Outlet_press_2-4_3 { nSurfaceLayers 3; } Outlet_walls_2-4_3 { nSurfaceLayers 3; } airInlet_vol_2-4_3 { nSurfaceLayers 3; } airOutlet_vol_2-4_3 { nSurfaceLayers 3; } human_walls_2-4_3 { nSurfaceLayers 3; } } // Expansion factor for layer mesh expansionRatio 1.0; // Wanted thickness of final added cell layer. If multiple layers // is the thickness of the layer furthest away from the wall. // Relative to undistorted size of cell outside layer. // See relativeSizes parameter. finalLayerThickness 0.3; // Minimum thickness of cell layer. If for any reason layer // cannot be above minThickness do not add layer. // Relative to undistorted size of cell outside layer. minThickness 0.1; // If points get not extruded do nGrow layers of connected faces that are // also not grown. This helps convergence of the layer addition process // close to features. // Note: changed(corrected) w.r.t 1.7.x! (didn't do anything in 1.7.x) nGrow 0; // Advanced settings // When not to extrude surface. 0 is flat surface, 90 is when two faces // are perpendicular featureAngle 60; // At non-patched sides allow mesh to slip if extrusion direction makes // angle larger than slipFeatureAngle. slipFeatureAngle 30; // Maximum number of snapping relaxation iterations. Should stop // before upon reaching a correct mesh. nRelaxIter 3; // Number of smoothing iterations of surface normals nSmoothSurfaceNormals 1; // Number of smoothing iterations of interior mesh movement direction nSmoothNormals 3; // Smooth layer thickness over surface patches nSmoothThickness 10; // Stop layer growth on highly warped cells maxFaceThicknessRatio 0.5; // Reduce layer growth where ratio thickness to medial // distance is large maxThicknessToMedialRatio 0.3; // Angle used to pick up medial axis points // Note: changed(corrected) w.r.t 1.7.x! 90 degrees corresponds to 130 // in 1.7.x. minMedialAxisAngle 90; // Create buffer region for new layer terminations nBufferCellsNoExtrude 0; // Overall max number of layer addition iterations. The mesher will exit // if it reaches this number of iterations; possibly with an illegal // mesh. nLayerIter 50; } // Generic mesh quality settings. At any undoable phase these determine // where to undo. meshQualityControls { #include "meshQualityDict" // Advanced //- Number of error distribution iterations nSmoothScale 4; //- Amount to scale back displacement at error points errorReduction 0.75; } // Advanced // Write flags writeFlags ( scalarLevels layerSets layerFields // write volScalarField for layer coverage ); // Merge tolerance. Is fraction of overall bounding box of initial mesh. // Note: the write tolerance needs to be higher than this. mergeTolerance 1e-6; // ************************************************************************* // |
実行コマンドは同じです。
計算の制御：controlDict
ここも変わっています。
system/controlDict
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FoamFile { version 2.0; format ascii; class dictionary; location "system"; object controlDict; } application buoyantFoam; startFrom startTime; startTime 0; stopAt endTime; endTime 60; deltaT 0.001; adjustTimeStep on; maxCo 0.9; writeControl adjustableRunTime; writeInterval 1; purgeWrite 0; writeFormat ascii; writePrecision 6; writeCompression off; timeFormat general; timePrecision 6; runTimeModifiable on; functions { #includeFunc residuals(U,p_rgh,h,k,epsilon); #includeFunc cellMinMag(U,writeLocation=yes); #includeFunc cellMaxMag(U,writeLocation=yes); #includeFunc cellMinMag(T,writeLocation=yes); #includeFunc cellMaxMag(T,writeLocation=yes); #includeFunc yPlus; #includeFunc CourantNo; } |
Foundation版の実行コマンドはbuoyantFoamです。
これをESI版に変更
system/controlDict
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FoamFile { version 2.0; format ascii; class dictionary; object controlDict; } application buoyantPimpleFoam; startFrom startTime; startTime 0; stopAt endTime; endTime 60; deltaT 0.001; writeControl adjustableRunTime;//timeStep; writeInterval 1; purgeWrite 0; writeFormat ascii; writePrecision 6; writeCompression off; timeFormat general; timePrecision 6; runTimeModifiable true; adjustTimeStep on; maxCo 0.9; functions { #includeFunc residuals(U,p_rgh,h,k,epsilon); #includeFunc cellMinMag(U,writeLocation=yes); #includeFunc cellMaxMag(U,writeLocation=yes); #includeFunc cellMinMag(T,writeLocation=yes); #includeFunc cellMaxMag(T,writeLocation=yes); #includeFunc yPlus; #includeFunc CourantNo; } // ************************************************************************* // |
ESI版の実行コマンドはbuoyantPimpleFoamです。
テキストはそこまで変更ないですが実行コマンドが異なります。
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