[calaba]

Hi Foamers!

I'm traing to mesh the geometry with SHM.

I have made the mesh with parts, first i do Castelled and after Snapping and i have no problem with the mesh (I have obtained a good) mesh.

The problem is when i tried to do the final process, addLayers. I try to change all the parameters but always get illegal faces.

For example, in my final simulation:

Checking faces in error :
non-orthogonality > 65 degrees : 1843
faces with face pyramid volume < 1e-13 : 0
faces with face-decomposition tet quality < 1e-100 : 66
faces with concavity > 80 degrees : 0
faces with skewness > 4 (internal) or 20 (boundary) : 0
faces with interpolation weights (0..1) < 0.05 : 0
faces with volume ratio of neighbour cells < 0.01 : 0
faces with face twist < 0.05 : 1
faces on cells with determinant < 0.001 : 0
Finished meshing with 1910 illegal faces (concave, zero area or negative cell pyramid volume)
Finished meshing in = 3307.65 s.
End

I attach my file case "snapping", and if it's possible i hope somebody could help me.

addLayersControls
{

relativeSizes false;


layers
{

wall
{
nSurfaceLayers 6;

}

IN5
{
nSurfaceLayers 4;

}

DF5
{
nSurfaceLayers 4;

}

DS5
{
nSurfaceLayers 4;

}



}

expansionRatio 1.5;

finalLayerThickness 0.04;

minThickness 0.0005;

nGrow 1;

featureAngle 30;


slipFeatureAngle 30;


nRelaxIter 6;


nSmoothSurfaceNormals 7;


nSmoothNormals 7;


nSmoothThickness 10;


maxFaceThicknessRatio 0.5;


maxThicknessToMedialRatio 0.3;


minMedianAxisAngle 150;


nBufferCellsNoExtrude 0;


nLayerIter 15;


nRelaxedIter 10;


}


meshQualityControls
{

maxNonOrtho 65;


maxBoundarySkewness 20;
maxInternalSkewness 4;


maxConcave 80;


minVol 1e-13;


minTetQuality 1e-100;


minArea -1;


minTwist 0.05;


minDeterminant 0.001;


minFaceWeight 0.05;


minVolRatio 0.01;


minTriangleTwist -1;


nSmoothScale 4;

errorReduction 0.75;


relaxed
{

maxNonOrtho 75;
}
}


mergeTolerance 1e-6;

Thanks in advanced!

[NablaDyn]

Without knowing your case I would recommend you to give cfMesh a shot. It seems to be a bit more rewarding in case of generating boundary-layer meshes. It's also not as complicated to set up a mesh generation file (meshDict).

I always struggled with SHM on complex geometries as it was simply not able to deliver a decent mesh, so I turned to cfMesh. I still experience some issues in my cases but for moderately complex or simple geometry it should serve you just fine.