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[cfMesh] Non Orthogonal Faces > 70 deg - cfMesh |
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January 12, 2017, 04:09 |
Non Orthogonal Faces > 70 deg - cfMesh
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#1 |
New Member
Praveen Kumar R
Join Date: Apr 2014
Location: Pune, India
Posts: 19
Rep Power: 12 |
I am trying to generate cartesian mesh for butterfly valve using cfMesh. My observation is for lower angles of valve opening (10,20,30), there are warnings of non-orthogonal faces > 70deg and it causes the simulation to diverge. Refining the mesh helps in avoiding this warning and also helps in convergence. But the mesh count goes very high.
Why they are appearing for lower angles of valve opening? How to avoid non-orthogonal faces>70deg in meshing? Is there any command that I can include in the meshDict file, to put control over mesh quality during mesh generation. Here is the link to download the mesh setup directory: https://drive.google.com/file/d/0B_ZwZhNE5SPLMWNWWmNESjk0STQ/view?usp=sharing |
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May 28, 2018, 14:30 |
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#2 |
New Member
Dr. Peyman Davvalo Khongar
Join Date: Mar 2018
Location: Helsinki (Finland)
Posts: 16
Rep Power: 8 |
Moi!
There is one important thing about your case. If you look at your boundary in polymesh directory, the faces have type empty. Do you run your simulations with this type or you modify it before running your solver? Some suggestions when you work with cfMesh: 1- Try to use fms format rather than stl. run this command: Code:
surfaceFeatureEdges -angle 60 ButterflyValve_FusionModel_30deg_DenseSTL.stl geo.fms Symmetry patch issue in cfMesh from stl file 2- when I take a look at your mesh, the non-orthogonal faces appears near to the narrow region between your disc and pipe. (Look at the attached photo). One thing you can do is to just keep this configuration of your meshDict and add 4 objectRefinements around those narrow regions. Like a sphere: Code:
objectRefinements { sphere { additionalRefinementLevels 1; // or cellSize SizeOfCell; type sphere; centre (0.5 0 0); radius 0.03; } } Hope it helps. Moikka, Peyman |
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cfmesh, mesh quality, non orthogonal |
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