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[snappyHexMesh] Cannot find any patch or group names matching the name of my STL file |
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May 12, 2023, 08:34 |
Cannot find any patch or group names matching the name of my STL file
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#1 |
New Member
Sergio Melendre
Join Date: Feb 2023
Posts: 5
Rep Power: 3 |
Hello everyone!
I am trying to simulate the flow around an inclined flat plate (I edited the files from the motorbike tutorial), the computational domain was created using blockMesh. I exported an STL file from Inventor but the quality was very poor, so I decided to refine the geometry in Salome by creating a mesh. In the SnappyHexMeshDict I am using the name of my solid as it is in the STL file and defined it as a wall. After running SnappyHexMesh the mesh is created but then, when visualizing in paraview I get a warning on terminal "Cannot find any patch or group names matching <name of my STL file>" in the polyMesh file. However, in paraview the mesh is created in the solid. I don't know what I am doing wrong. Thanks in advance! |
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May 13, 2023, 05:47 |
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#2 |
Senior Member
M
Join Date: Dec 2017
Posts: 703
Rep Power: 12 |
Welcome to the forum Sergio.
Without further information it is hard to say. You say you have a poor quality stl and created a "mesh" in Salome. What do you mean with mesh here? A refined stl or a finite volume mesh? I assume its the first, but be careful with the nomenclature here. Then going to snappy, there are several things that could be wrong, we need to have a look at the snappyHexMeshDict and maybe also the blockMeshDict you are using. You can also share the case, if its not confidential. Best regards. |
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May 13, 2023, 06:03 |
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#3 |
New Member
Sergio Melendre
Join Date: Feb 2023
Posts: 5
Rep Power: 3 |
Hello AtoHM,
Thank you for your reply and sorry for the confusion, I actually refined the stl file in Salome. Code:
/*--------------------------------*- C++ -*----------------------------------*\ ========= | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox \\ / O peration | Website: https://openfoam.org \\ / A nd | Version: 10 \\/ M anipulation | \*---------------------------------------------------------------------------*/ FoamFile { format ascii; class dictionary; object blockMeshDict; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // convertToMeters 1; vertices ( (-10 0 -10) // vertex 0 (50 0 -10) // vertex 1 (-10 10 -10) // vertex 2 (50 10 -10) // vertex 3 (-10 0 10) // vertex 4 (50 0 10) // vertex 5 (-10 10 10) // vertex 6 (50 10 10) // vertex 7 ); blocks ( hex (0 1 3 2 4 5 7 6) (120 20 40) simpleGrading (1 1 1) ); boundary ( frontAndBack { type patch; faces ( (0 2 3 1) (6 4 5 7) ); } inlet { type patch; faces ( (6 2 0 4) ); } outlet { type patch; faces ( (3 7 5 1) ); } lowerWall { type wall; faces ( (0 1 5 4) ); } upperWall { type patch; faces ( (2 6 7 3) ); } ); // ************************************************************************* // Code:
/*--------------------------------*- C++ -*----------------------------------*\ ========= | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox \\ / O peration | Website: https://openfoam.org \\ / A nd | Version: 10 \\/ M anipulation | \*---------------------------------------------------------------------------*/ FoamFile { format ascii; class dictionary; object snappyHexMeshDict; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // // Which of the steps to run castellatedMesh true; // make basic mesh? snap true; // decide to snap back to surface? addLayers true; // decide to add viscous layer? Better to add only after a good mesh! // 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 { standalonePanel { type triSurfaceMesh; file "standalonePanel.stl"; name standalonePanel; } refinementBox { type searchableBox; min (-5 0 -10); max (15 10 10); } }; // 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/geometry for now. /* features ( { file "standalonePanel.eMesh"; level 6; } ); */ // 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 { standalonePanel { // Surface-wise min and max refinement level level (3 3); // Optional specification of patch type (default is wall). No // constraint types (cyclic, symmetry) etc. are allowed. 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; level 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 insidePoint is kept. // NOTE: This point should never be on a face, always inside a cell, even // after refinement. locationInMesh (-0.8567333524755063 1.7537462815845348 0.8570109183772807); // 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 { "(lowerWall|standalonePanel).*" { nSurfaceLayers 1; } } // 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 17x! (didn't do anything in 17x) 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 17x! 90 degrees corresponds to 130 in 17x. minMedianAxisAngle 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 // 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; |
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May 13, 2023, 06:38 |
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#4 |
New Member
Sergio Melendre
Join Date: Feb 2023
Posts: 5
Rep Power: 3 |
Hello AtoHM.
Thanks for your reply and sorry for the consufion. I actually refined the stl in Salome. I tried to reply including the blockMeshDict and SnappyHexMeshDict files in the "Go Advanced" option but the reply is not posted. |
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May 13, 2023, 06:56 |
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#5 |
Senior Member
M
Join Date: Dec 2017
Posts: 703
Rep Power: 12 |
Just copy and paste the content of the dictionaries here. The stl would help to understand your geometry and check consistency of the dimensions.
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May 13, 2023, 07:02 |
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#6 |
New Member
Sergio Melendre
Join Date: Feb 2023
Posts: 5
Rep Power: 3 |
blockMeshDict:
/*--------------------------------*- C++ -*----------------------------------*\ ========= | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox \\ / O peration | Website: https://openfoam.org \\ / A nd | Version: 10 \\/ M anipulation | \*---------------------------------------------------------------------------*/ FoamFile { format ascii; class dictionary; object blockMeshDict; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // convertToMeters 1; vertices ( (-10 0 -10) // vertex 0 (50 0 -10) // vertex 1 (-10 10 -10) // vertex 2 (50 10 -10) // vertex 3 (-10 0 10) // vertex 4 (50 0 10) // vertex 5 (-10 10 10) // vertex 6 (50 10 10) // vertex 7 ); blocks ( hex (0 1 3 2 4 5 7 6) (120 20 40) simpleGrading (1 1 1) ); boundary ( frontAndBack { type patch; faces ( (0 2 3 1) (6 4 5 7) ); } inlet { type patch; faces ( (6 2 0 4) ); } outlet { type patch; faces ( (3 7 5 1) ); } lowerWall { type wall; faces ( (0 1 5 4) ); } upperWall { type patch; faces ( (2 6 7 3) ); } ); // ************************************************** *********************** // snappyHexMeshDict: /*--------------------------------*- C++ -*----------------------------------*\ ========= | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox \\ / O peration | Website: https://openfoam.org \\ / A nd | Version: 10 \\/ M anipulation | \*---------------------------------------------------------------------------*/ FoamFile { format ascii; class dictionary; object snappyHexMeshDict; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // // Which of the steps to run castellatedMesh true; // make basic mesh? snap true; // decide to snap back to surface? addLayers true; // decide to add viscous layer? Better to add only after a good mesh! // 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 { standalonePanel { type triSurfaceMesh; file "standalonePanel.stl"; name standalonePanel; } refinementBox { type searchableBox; min (-5 0 -10); max (15 10 10); } }; // 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/geometry for now. /* features ( { file "standalonePanel.eMesh"; level 6; } ); */ // 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 { standalonePanel { // Surface-wise min and max refinement level level (3 3); // Optional specification of patch type (default is wall). No // constraint types (cyclic, symmetry) etc. are allowed. 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; level 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 insidePoint is kept. // NOTE: This point should never be on a face, always inside a cell, even // after refinement. locationInMesh (-0.8567333524755063 1.7537462815845348 0.8570109183772807); // 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 { "(lowerWall|standalonePanel).*" { nSurfaceLayers 1; } } // 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 17x! (didn't do anything in 17x) 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 17x! 90 degrees corresponds to 130 in 17x. minMedianAxisAngle 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 // 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; // ************************************************** *********************** // |
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May 13, 2023, 15:24 |
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#7 |
New Member
Sergio Melendre
Join Date: Feb 2023
Posts: 5
Rep Power: 3 |
I managed to create the mesh.
I just needed to refine my stl file even more and use: 'snappyHexMesh -overwrite' |
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Tags |
salome, snappyhexmesh, stl file, warning message |
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