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[snappyHexMesh] snappyHexMesh does not snap everywhere

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Old   February 11, 2011, 05:47
Default snappyHexMesh does not snap everywhere
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Hello,

I am trying to make a mesh around a polyhedron that approximates a ball, using snappyHexMesh in 1.7.1. I try to snap the surface, but this only works out around the "equator" (xy-plane). Near the "poles" the mesh remains blocky and does not follow the surface.

What did I forget?
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Old   February 13, 2011, 17:56
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Aidan
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It's not snapping to the surface because you have the refinement turned off.

In the refinementSurfaces section set level (1 1) to level (1 2) and in the refinementRegions section set levels ((1e5 0)) to levels ((1e5 2))
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Old   February 14, 2011, 02:12
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I am sorry, but that does not help. I thought that anything that had to do with the snapping action, was in the snapControls subdictionary.
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Old   June 4, 2013, 14:23
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Giovani Diniz
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Flowris,

I am having the exact same problem wit my geometry. Did you figure out what was going on?
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Old   June 5, 2013, 13:52
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Kent Wardle
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Hello ~ this does seem like odd behavior and just looking at your dict file I don't see any obvious problems. However, you are using an old version of OF, one in which snappy was still relatively new. Many developments, especially with surface/feature snapping, have happened since then. I would suggest that you try it with a new(er) version and verify that you still have this problem.
-Kent
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Old   June 11, 2013, 10:40
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Mihai Pruna
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might sound counterintuitive but try to decrease the maximum global cells.
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Old   June 11, 2013, 10:47
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Hi,

So, I figured out what the problem was.

In the blockMeshDict I had set the inlet and outlet patches as "empty".
As soon as I set them as "patches", everything worked out.

Thanks for the reply, though!

Cheers
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Old   February 17, 2019, 05:17
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Thank you!!!
I had the same problem and have tried the suggestions in all the other threads and nothing was working. Seems it was as simple, though not obvious, as changing one of my boundaries from 'empty' to 'patch' and it works fine now.
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