snappyHexMesh为何怎么划分 还是会出现不均匀的错误网格?。快疯了



  • snappyHexMesh为何怎么划分 还是会出现不均匀的错误网格?。快疯了 求解答下0_1503045662410_屏幕快照 2017-08-18 下午5.38.07.png !

    这个是snappyHexMeshDic

    castellatedMesh true;    // make basic mesh ?
    snap            true;    // decide to snap back to surface ?
    addLayers       true;   // decide to add viscous layers ?
    
    
    geometry // Load in STL files here
    {
    	inlet.stl {type triSurfaceMesh; name inlet;}
    	outlet.stl {type triSurfaceMesh; name outlet;}
    	part1.stl {type triSurfaceMesh; name part1;}
       part2.stl {type triSurfaceMesh; name part2;}
    	volume.stl {type triSurfaceMesh; name volume;}
    	
    };
    
    castellatedMeshControls
    {
        maxLocalCells 1000000;  //max cells per CPU core
        maxGlobalCells 2000000; //max cells to use before mesh deletion step
        minRefinementCells 0;  //was 0 - zero means no bad cells are allowed during refinement stages
        maxLoadUnbalance 0.1;
        nCellsBetweenLevels 1;  // expansion factor between each high & low refinement zone
    
        // Explicit feature edge refinement
        // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    
        features // taken from STL from each .eMesh file created by "SurfaceFeatureExtract" command
        (
            {file "inlet.eMesh"; level 0;} 
            {file "outlet.eMesh"; level 0;} 
            {file "part1.eMesh"; level 0;} 
            {file "part2.eMesh"; level 0;} 
        );
    
        // Surface based refinement
        // ~~~~~~~~~~~~~~~~~~~~~~~~
    
        refinementSurfaces // Surface-wise min and max refinement level
        {
    	inlet {level (0 0);}
       outlet {level (0 0);}
    	part1 {level (0 0);} 
       part2 {level (0 0);} 
        }  
    
    
        resolveFeatureAngle 80;  // Resolve sharp angles // Default 30
        refinementRegions        // In descending levels of fine-ness
        {} // was ((0.001 4) (0.003 3) (0.01 2))
        locationInMesh (0.01 0 0);  //to decide which side of mesh to keep **
        allowFreeStandingZoneFaces true;
    }
    
    
    // Settings for the snapping.
    snapControls
    {
        nSmoothPatch 3;
        tolerance 2.0;
        nSolveIter 30;
        nRelaxIter 5;
        nFeatureSnapIter 10; // default is 10
        
    // New settings from openfoam 2.2 onwards for SHMesh
    
    implicitFeatureSnap false; // default is false - detects without doing surfaceFeatureExtract
    explicitFeatureSnap true; // default is true
    multiRegionFeatureSnap false; // deafault is false - detects features between multiple surfaces
    
    }
    
    
    
    addLayersControls //add the PATCH names from inside the STL file so STLpatchName_insideSTLName 
    {
        relativeSizes false; // was true
        layers
        {
    	
        }
    
        expansionRatio 1.3;
        finalLayerThickness 0.00016; //was 0.00016
        minThickness 0.00008; //was 0.00008
        nGrow 0; // was 1 
    
    
        // Advanced settings
    
        featureAngle 80; // was 70 //- When not to extrude surface. 0 is flat, 90 is right angle.
        nRelaxIter 3;  //- Max# of snapping relaxation iter. Should stop before upon reaching a correct mesh.
        nSmoothSurfaceNormals 1;  
        nSmoothNormals 3; 
        nSmoothThickness 10;  
        maxFaceThicknessRatio 0.5; 
        maxThicknessToMedialRatio 0.3; 
    thickness to medial distance is large
        minMedianAxisAngle 130; 
        nBufferCellsNoExtrude 0;  
        nLayerIter 50; 
    }
    
    
    
    
    meshQualityControls
    {
        maxNonOrtho 65;
        maxBoundarySkewness 20;
        maxInternalSkewness 4;
        maxConcave 80;
        minFlatness 0.5;
        minVol 1e-13;
        minTetQuality 1e-9;
        minArea -1;
        minTwist 0.02;
        minDeterminant 0.001;
        minFaceWeight 0.02;
        minVolRatio 0.01;
        minTriangleTwist -1;
    
        // Advanced
    
        nSmoothScale 4;
        errorReduction 0.75;
    }
    
    // Advanced
    
    debug 0;
    
    mergeTolerance 1E-6;
    

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