| Fool |
January 2, 2019 10:57 |
snappyhexmesh cuts small gaps into geometry
1 Attachment(s)
Hello together,
I am trying to do a hexahedral mesh of a basin with an inclination on one side.
My problem is that the edges at the top of the basin don't get cut off properly as you can see in the picture.
I've tried to play around with the edge refinement and some angle settings but nothing really worked well as I don't want that edge to be very fine because then it takes to long to run the process.
Do you have any suggestions for me?
Here's the snappyHexMeshDict. The part is named as "end_wall". The top of the geometry is "outlet".
PHP Code:
/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 2.2.0 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
object snappyHexMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
castellatedMesh true;
snap true;
addLayers false;
geometry
{
inlet.stl {type triSurfaceMesh; name inlet;}
outlet.stl {type triSurfaceMesh; name outlet;}
visc_main_wall.stl {type triSurfaceMesh; name visc_main_wall;}
end_wall.stl {type triSurfaceMesh; name end_wall;}
rinne_wall.stl {type triSurfaceMesh; name rinne_wall;}
becken.stl {type triSurfaceMesh; name becken;}
refinementBox {type searchableBox; min (-30 -23 -25); max ( 97 70 28);}
};
castellatedMeshControls
{
maxLocalCells 1000000;
maxGlobalCells 2000000;
minRefinementCells 10;
maxLoadUnbalance 0.10;
nCellsBetweenLevels 1;
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
features
(
{file "inlet.eMesh"; level 3;}
{file "outlet.eMesh"; level 3;}
{file "visc_main_wall.eMesh"; level 3;}
{file "end_wall.eMesh"; level 3;}
{file "rinne_wall.eMesh"; level 3;}
);
refinementSurfaces
{
inlet {level (2 2);}
outlet {level (2 2);}
visc_main_wall {level (3 3);}
end_wall {level (5 7);}
rinne_wall {level (5 5);}
}
resolveFeatureAngle 30;
refinementRegions
{volume {mode distance; levels ((0.0006 4) (0.002 3) (0.01 2));}}
locationInMesh (18.0 17.0 0.47);
allowFreeStandingZoneFaces true;
}
snapControls
{
nSmoothPatch 3;
tolerance 4.0;
nSolveIter 30;
nRelaxIter 5;
nFeatureSnapIter 15;
implicitFeatureSnap false;
explicitFeatureSnap true;
multiRegionFeatureSnap false;
}
addLayersControls
{
relativeSizes false;
layers
{
visc_main_wall
{nSurfaceLayers 3;}
end_wall
{nSurfaceLayers 3;}
rinne_wall
{nSurfaceLayers 3;}
}
expansionRatio 1.3;
finalLayerThickness 0.00016;
minThickness 0.00008;
nGrow 0;
featureAngle 80;
nRelaxIter 3;
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;
minTetQuality 1e-9;
minArea -1;
minTwist 0.02;
minDeterminant 0.001;
minFaceWeight 0.02;
minVolRatio 0.01;
minTriangleTwist -1;
nSmoothScale 4;
errorReduction 0.75;
}
debug 0;
//************************************************************************* //
Attachment 67501 |
