|
[Sponsors] |
Problem with entire domain comprised of split hex cells |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
November 7, 2016, 10:16 |
Problem with entire domain comprised of split hex cells
|
#1 |
New Member
Ben
Join Date: May 2016
Posts: 9
Rep Power: 10 |
Hello all,
I'm trying to modify my flow domain so it's comprised of both hex and split hex cells. The problem is that no matter what I try, the entire domain will be comprised of hex cells. Below is an image of my mesh and my snappyHexMeshDict: flow domain http://imgur.com/DjQ8jFa snappyHexMeshDict Code:
/*--------------------------------*- C++ -*----------------------------------*\ | ========= | | | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox | | \\ / O peration | Version: 3.0.1 | | \\ / A nd | Web: www.OpenFOAM.org | | \\/ M anipulation | | \*---------------------------------------------------------------------------*/ 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 { final_validation_top.stl { type triSurfaceMesh; name final_validation_top; } final_validation_bot.stl { type triSurfaceMesh; name final_validation_bot; } /*refinementBox_1 { type searchableBox; min (-0.09 -0.15 0.0); //1 cell to the left max (0.7 0.12 0.9144); //twice the chord length to the right } refinementBox_2 { type searchableBox; min (-0.06 -0.12 0.0); //1 cell to the left max ( 0.65 0.09 0.9144); //twice the chord length to the right } refinementBox_3 { type searchableBox; min (-0.03 -0.09 0.0); //1 cell to the left max ( 0.6 0.06 0.9144); //twice the chord length to the right }*/ refinementBox_1 { type searchableBox; min (-0.4572 -0.3048 0.0); //1 cell to the left max (0.762 0.3048 0.6096); //twice the chord length to the right } refinementBox_2 { type searchableBox; min (-0.36 -0.24 0.0); //1 cell to the left max ( 0.74 0.24 0.6096); //twice the chord length to the right } refinementBox_3 { type searchableBox; min (-0.24 -0.18 0.0); //1 cell to the left max ( 0.7 0.18 0.6096); //twice the chord length to the right } }; // Settings for the castellatedMesph 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 10000000; // 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 200000000; // 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 "final_validation_top.eMesh"; level 4;} {file "final_validation_bot.eMesh"; level 4;} ); // 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 { final_validation_top { // Surface-wise min and max refinement level level (4 4); // Optional specification of patch type (default is wall). No // constraint types (cyclic, symmetry) etc. are allowed. } final_validation_bot { // Surface-wise min and max refinement level level (4 4); // Optional specification of patch type (default is wall). No // constraint types (cyclic, symmetry) etc. are allowed. } } // Resolve sharp angles resolveFeatureAngle 80; //was 30 by default // 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_1 { mode inside; levels ((1.0 1)); } refinementBox_2 { mode inside; levels ((1.0 2)); } refinementBox_3 { mode inside; levels ((1.0 3)); } } // 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 (-0.001 -0.001 0.001); // 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 false; // Per final patch (so not geometry!) the layer information layers { final_validation_top.stl { nSurfaceLayers 20; } final_validation_bot.stl { nSurfaceLayers 20; } } // Expansion factor for layer mesh expansionRatio 1.1; // 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 0.003; // 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 0.00015; // 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 //- 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; // ************************************************************************* // Thanks guys |
|
November 8, 2016, 00:01 |
|
#2 |
New Member
Ben
Join Date: May 2016
Posts: 9
Rep Power: 10 |
Turns out all I had to to was untick 'Triangulate the slice' in ParaView! It was all just a visualization issue, my domain is indeed composed of hex and split hex.
|
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
[blockMesh] FATAL ERROR: face 6 in patch 2 does not have neighbour cell face: 4(8 9 21 20) | robingilbert | OpenFOAM Meshing & Mesh Conversion | 28 | November 23, 2023 07:32 |
ill defined primitive entry 'boundary' | francisco.angel | OpenFOAM Pre-Processing | 16 | September 8, 2022 07:11 |
[snappyHexMesh] sHM layer process keeps getting killed | MBttR | OpenFOAM Meshing & Mesh Conversion | 4 | August 15, 2016 04:21 |
Closed Domain Buoyancy Flow Problem | Madhatter92 | CFX | 6 | June 20, 2016 22:05 |
[blockMesh] Problem with mesh. non closed cells. | AlexanderZ | OpenFOAM Meshing & Mesh Conversion | 1 | April 3, 2013 10:44 |