[chriss85]

I'm currently trying to create a mesh for a complicated geometry. snappyHexMesh didn't work for me so far, because I couldn't manage to create a watertight geometry from CAD while still preserving single surfaces. This results in it not being able to determine the inside of the geometry.

cfMesh works much better here, and captures the geometry of the STL file, however I'm getting some low-quality cells close to the surfaces of the STL.

Here's the relevant checkMesh output:

Mesh non-orthogonality Max: 76.74187 average: 2.585366
*Number of severely non-orthogonal (> 70 degrees) faces: 12.
Non-orthogonality check OK.
<<Writing 12 non-orthogonal faces to set nonOrthoFaces
Face pyramids OK.
***Max skewness = 5.324171, 4 highly skew faces detected which may impair the quality of the results
<<Writing 4 skew faces to set skewFaces

Are there any options I might not know about in cfMesh that control the relaxation of such cells?

Is it possible to use the mesh from cfMesh as input for snappyHexMesh, and have it perform only the snapping stage (since it fails in the first stage for my STL file)?
I tried to enable only snapping in snappyHexMeshDict, but the resulting mesh was the same as the input mesh.

Also, what schemes are best when most of the cells are very much orthogonal, but some are highly non-orthogonal, like in this case?