@xpqiu 感谢回复！
现在把inlet，outlet和本体分开转换成stl文件 然后snappyHexMesh了一下
0_1499148821716_屏幕快照 2017-07-04 下午3.07.55.png
圆柱是r=18mm h=20mm inlet尺寸是r=1.5mm，h=3mm这样够不够大？现在想按您说的把空气区域和喷口区域网格如何变的密集？该添加哪些代码。。 求指导一下
这个是我现在的snappyHexMeshDic
FoamFile
{
version 2.0;
format ascii;
class dictionary;
object snappyHexMeshDict;
}
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;}
wall.stl {type triSurfaceMesh; name wall;}
volume.stl {type triSurfaceMesh; name volume;}
refinementBox {type searchableBox; min (-0.03 -0.03 -0.03); max ( 0.03 0.3 0.3);}
};
castellatedMeshControls
{
maxLocalCells 1000000; //max cells per CPU core
maxGlobalCells 2000000; //max cells to use before mesh deletion step
minRefinementCells 10; //was 0 - zero means no bad cells are allowed during refinement stages
maxLoadUnbalance 0.10;
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 2;}
{file "outlet.eMesh"; level 2;}
{file "wall.eMesh"; level 2;}
);
// Surface based refinement
// ~~~~~~~~~~~~~~~~~~~~~~~~
refinementSurfaces // Surface-wise min and max refinement level
{
inlet {level (0 0);}
outlet {level (0 0);}
wall {level (3 3);}
}
resolveFeatureAngle 80; // Resolve sharp angles // Default 30
refinementRegions // In descending levels of fine-ness
{volume {mode distance; levels ((0.0006 3) (0.002 2) (0.01 1));}} // 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 4.0;
nSolveIter 30;
nRelaxIter 5;
nFeatureSnapIter 15; // 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
}
// Settings for the layer addition.
addLayersControls //add the PATCH names from inside the STL file so STLpatchName_insideSTLName
{
relativeSizes false; // was true
layers
{
wall
{nSurfaceLayers 3;} // was 3
}
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; // Number of smoothing iterations of surface normals
nSmoothNormals 3; // Number of smoothing iterations of interior mesh movement direction
nSmoothThickness 10; // Smooth layer thickness over surface patches
maxFaceThicknessRatio 0.5; // Stop layer growth on highly warped cells
maxThicknessToMedialRatio 0.3; // Reduce layer growth where ratio thickness to medial distance is large
minMedianAxisAngle 130; // Angle used to pick up medial axis points
nBufferCellsNoExtrude 0; // Create buffer region for new layer terminations
nLayerIter 50; // Overall max number of layer addition iterations
}
// Generic mesh quality settings. At any undoable phase these determine
// where to undo.
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;
// Merge tolerance. Is fraction of overall bounding box of initial mesh.
// Note: the write tolerance needs to be higher than this.
mergeTolerance 1E-6;
// ************************************************************************* //
