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[snappyHexMesh] How to have well snapped surfaces and keep reasonable cell size?

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Old   November 15, 2021, 03:42
Default How to have well snapped surfaces and keep reasonable cell size?
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Hi everybody,
I am trying to mesh an open channel domain for simulation with interFoam. I use an .stl file for the channel geometry. The channel has very smooth walls so I think it should not be too hard to have good snapping to the surface.
However, so far I have only achieved, satisfying snapping, when I choose very high refinement levels. This gives me a mesh with small cells close to the surface resulting in extremely slow computation time (see below). My colleague on the other hand created a similar mesh shown in using cfMesh. Apparently it does not require such high cell refinement close to the surface.
How can I set sHM parameters to get a mesh that also has reasonably large cells but still gets the surface well?
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File Type: jpg sHM.jpg (75.1 KB, 25 views)
File Type: jpg cf_mesh.jpg (62.0 KB, 24 views)
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Old   November 17, 2021, 07:00
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Hello
Try setting nSmoothPatch in snapControls to 0, if it isn't already - it looks like it might be smoothing your surface, which shows up more in the coarse one as the movement allowed when smoothing scales with cell size.
Also have a look in the other time directories at the castellated mesh it's generating before snapping, that can often give a hint as to where it's going wrong
Hope this helps
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cell refinement, cfmesh, snappyhexmesh, surface snapping

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