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October 11, 2023, 05:21 |
Error during the snappyHexMesh
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#1 |
New Member
TGS
Join Date: May 2023
Location: United Kingdom
Posts: 27
Rep Power: 2 |
Hi,
Currently, I am using the OpenFOAM V1912. I have a heat transfer problem related to the conventional fin geometry. I successfully created my blockMesh, and then I successfully ran the surfaceFeatureExtract command too. However, while I am running the snappyHexMesh command, I am getting an error. The error is mentioned at the below. At the moment, I am running the programme using a super computer. However, when I was running snappyHexMeshDict on my local computer for the same case, I didn't get any errors. Only I am getting the error while I am running it in the cluster. Initially, I thought it was because of the large mesh size, but I reduced the mesh size as well. However, I am still getting the same error. The snappyHexMeshDict is also attached herewith. Please help me. Code:
/*--------------------------------*- C++ -*----------------------------------*\ ========= | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox \\ / O peration | Version: v1912 \\ / A nd | Website: www.openfoam.com \\/ M anipulation | \*---------------------------------------------------------------------------*/ FoamFile { version 2.0; format ascii; class dictionary; object snappyHexMeshDict; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // // Which of the steps to run castellatedMesh true; snap true; addLayers false; // 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 { finModified.stl { type triSurfaceMesh; name finModified; } heatedBoundary.stl { type triSurfaceMesh; name heatedBoundary; } refinementBox { type searchableBox; min (-1.0 -0.7 0.0); max ( 8.0 0.7 2.5); } // refinementBox // { // type searchableBox; // min (-1.0 -0.7 0.0); // max ( 8.0 0.7 2.5); // } }; // 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 "finModified.eMesh"; level 6; } { file "heatedBoundary.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 { finModified { // Surface-wise min and max refinement level level (1 2); // Optional specification of patch type (default is wall). No // constraint types (cyclic, symmetry) etc. are allowed. } heatedBoundary { // Surface-wise min and max refinement level level (1 2); // Optional specification of patch type (default is wall). No // constraint types (cyclic, symmetry) etc. are allowed. } } // 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; // default (min max) refinement for whole surface levels ((1 2)); // faceZone fin_to_air; // cellZone fin; // cellZoneInside inside; // Keep mesh in fin region. } } // 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. insidePoint (-9.0 -69.2 15); // 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 { finModified { nSurfaceLayers 1; } heatedBoundary { 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 20; } // 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; // ************************************************************************* // Code:
--> FOAM FATAL ERROR: no points or no cells in mesh bad size -2147483647 From function Foam::List<T>::List(int, Foam::zero) [with T = int] in file /lustre/scafellpike/local/apps/intel/OpenFOAM/OpenFOAM-v1912/src/OpenFOAM/lnInclude/List.C at line 141. FOAM aborting #0 Foam::error::printStack(Foam::Ostream&) at ??:? #1 Foam::error::abort() at ??:? #2 Foam::meshRefinement::printMeshInfo(bool, Foam::string const&) const at ??:? #3 Foam::meshRefinement::baffleAndSplitMesh(bool, Foam::snapParameters const&, bool, bool, Foam::Field<double> const&, int, Foam::dictionary const&, Foam::Time&, Foam::List<int> const&, Foam::List<int> const&, Foam::Field<Foam::Vector<double> > const&, Foam::List<Foam::word> const&, Foam::Field<Foam::Vector<double> > const&, Foam::writer<double> const&) at ??:? #4 Foam::snappyRefineDriver::baffleAndSplitMesh(Foam::refinementParameters const&, Foam::snapParameters const&, bool, Foam::dictionary const&) at ??:? #5 Foam::snappyRefineDriver::doRefine(Foam::dictionary const&, Foam::refinementParameters const&, Foam::snapParameters const&, bool, Foam::meshRefinement::FaceMergeType, Foam::dictionary const&) at ??:? #6 ? at ??:? #7 __libc_start_main in /lib64/libc.so.6 #8 ? at ??:? Aborted |
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Tags |
cfd - post, meshing, opeanfoam, snappy hex mesh |
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