# snappyHexMesh beginner problems

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 November 16, 2009, 09:14 snappyHexMesh beginner problems #1 Member   Join Date: Nov 2009 Location: Munich Posts: 43 Rep Power: 7 Hello everyone, I'm a beginner with OF and trying to sHM a little test file, but i have several problems. # 1 How can I specify apropriate boundary-, faces-, neighbour-, points- and owner-files for my specail case? They won't be created by sHM, right? But how can I then get the right entries, e.g. number of vartices (for my case) into those files? #2 When executing snappyHexMesh, I reviece following error message: __________________________________________________ ________________ Create time Create mesh for time = 0 Read mesh in = 0.41 s Overall mesh bounding box : (-0.05 -0.025 -0.02) (0.05 0.025 0.02) Relative tolerance : 1e-06 Absolute matching distance : 1.18743e-07 Reading refinement surfaces. Read refinement surfaces in = 0 s Reading refinement shells. Refinement level 4 for all cells inside box.stl shellSurfaces : Flipped orientation of surface box.stl so point (150 75 60) is outside. Read refinement shells in = 0.01 s Setting refinement level of surface to be consistent with shells. Checked shell refinement in = 0 s Determining initial surface intersections ----------------------------------------- Edge intersection testing: Number of edges : 58750 Number of edges to retest : 58750 Number of intersected edges : 0 Calculated surface intersections in = 0.43 s Initial mesh : cells:18750 faces:58750 points:21346 Cells per refinement level: 0 18750 Adding patches for surface regions ---------------------------------- Patch Region ----- ------ refinementBox: 8 refinementBox_region0 Added patches in = 0 s Selecting decompositionMethod hierarchical Refinement phase ---------------- Point (3 3 0.43) is not inside the mesh or on a face or edge. Bounding box of the mesh-0.05 -0.025 -0.02) (0.05 0.025 0.02) From function refinementParameters::findCells(const polyMesh&) const in file autoHexMesh/autoHexMeshDriver/refinementParameters/refinementParameters.C at line 104. FOAM exiting __________________________________________________ ________________ Does this mean, my original blockMesh is too smal? Do I have to enlarge it? Here's my snappyHesMeshDict file: __________________________________________________ ________________ geometry { box.stl { type triSurfaceMesh; name box; }; refinementBox { type searchableBox; min (-1.0 -0.7 0.0); max ( 8.0 0.7 2.5); } }; castellatedMeshControls { maxLocalCells 1000000; maxGlobalCells 2000000; minRefinementCells 100; nCellsBetweenLevels 1; // features // ( // { // file "fridgeA.eMesh"; // level 3; // } // // ); refinementSurfaces { box.stl { level (1 3); } } resolveFeatureAngle 60; refinementRegions { box { mode inside; levels ((1.0 4)); } } locationInMesh (3 3 0.43); } snapControls { nSmoothPatch 3; tolerance 4.0; nSolveIter 30; nRelaxIter 5; } addLayersControls { relativeSizes false; layers { box.stl { nSurfaceLayers 3; } } expansionRatio 1.0; finalLayerThickness 0.5; minThickness 0.25; nGrow 0; featureAngle 60; nRelaxIter 5; nSmoothSurfaceNormals 1; nSmoothNormals 3; nSmoothThickness 10; maxFaceThicknessRatio 0.5; maxThicknessToMedialRatio 0.3; minMedianAxisAngle 130; nBufferCellsNoExtrude 0; nLayerIter 50; } meshQualityControls { maxNonOrtho 65; maxBoundarySkewness 20; maxInternalSkewness 4; maxConcave 80; minFlatness 0.5; minVol 1e-13; minArea -1; minTwist 0.05; minDeterminant 0.001; minFaceWeight 0.05; minVolRatio 0.01; minTriangleTwist -1; nSmoothScale 4; errorReduction 0.75; } debug 0; mergeTolerance 1E-6; __________________________________________________ _______________

 November 16, 2009, 09:47 #2 Member   Join Date: Nov 2009 Location: Munich Posts: 43 Rep Power: 7 All right, I enlarged the blockMes and now sHM basicly running. :-) Although I think, there need to be more improvement on the sHMDict, because it's working quite long on such an easy surface, I entered.

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