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about polyDualMesh "Try something smaller than 90"
Posted March 28, 2013 at 02:06 by skeptik
Originally Posted by lillberg
Try something smaller than 90 deg feature angle since it represents the maximum angle between two neighboring surface normals on a surface without corners. That is, the mesh will consider your surface shape a corner if the angel is larger than this value. I typically use something between 45 and 80 depending on the tet mesh resolution on highly curved surfaces. This might be the root of your problem. Looking at my picture the curved surface in the middle would (wrongly) be treated as a corner if the feature angle was set to some 30 deg. Here I used 75 degrees, but anything abowe 45 usually works. In your case virtually no corners are treated as such.
I often use Gambit or T-grid for tet/hex + tet-prism b-layer mesh generation and then convert the mesh using polyDualMesh. The result is in the picture.
Full topic Polyhedral mesh generation