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[snappyHexMesh] failed to snap to a symmetry boundary condition patch |
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January 22, 2021, 21:06 |
failed to snap to a symmetry boundary condition patch
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#1 |
Senior Member
Charles
Join Date: Aug 2016
Location: Vancouver, Canada
Posts: 151
Rep Power: 10 |
I have a model with a geometry like a 3D wedge. The two sides of the wedge use symmetry boundary condition. I use snappyHexMesh to mesh the wedge with background mesh of a block mesh. All cellls are cubic. The wedge circular end was snapped well but not the two sides. For the two sides, it basically did nothing. I changed the boundary conditions of the two sides to type wall. It snapped perfectly. Anyone has this experience? Any help?
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Charles L. |
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February 26, 2024, 03:31 |
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#2 |
New Member
Marco Müller
Join Date: Feb 2013
Location: Germany
Posts: 23
Rep Power: 13 |
Hi Charles,
did you find a solution? I'm facing the same issue where shm fails to snap to a symmetry plan not parallel to the main planes. In my case there is a 120 degree section, see attachment. Changing it to wall type shows no problem for the snapping Marco |
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February 26, 2024, 04:27 |
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#3 |
Senior Member
M
Join Date: Dec 2017
Posts: 698
Rep Power: 12 |
Pragmatic solution: mesh it with "wall" and just change the type back to symmetric in the boundary file once meshing is complete. Obviously you need to work in ASCII.
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February 26, 2024, 13:35 |
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#4 |
Senior Member
Charles
Join Date: Aug 2016
Location: Vancouver, Canada
Posts: 151
Rep Power: 10 |
Yes, I should have updated the solution. snappyHexMesh does not snap "symmetry" patch. It snaps "wall" patch. The solution is as AtoHM said.
1. define the "symmetry" patch type "wall" 2. After generating mesh, edit file boundary in folder constant/polyMesh and change the patch type "wall" back to "symmetry"
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Charles L. |
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February 26, 2024, 14:52 |
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#5 |
New Member
Marco Müller
Join Date: Feb 2013
Location: Germany
Posts: 23
Rep Power: 13 |
Thanks guys! Though a little hard to understand why shm doesnt snap to it...
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