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Symmetry plane 'midPlane' is not planar

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Old   November 21, 2023, 05:50
Exclamation Symmetry plane 'midPlane' is not planar
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Hello everyone, I'm a student and new in OpenFOAM CFD software. I have a problem (FOAM FATAL ERROR) when I'm trying to execute the 'reconstructParMesh -mergeTol 0.000001 -constant' command after the 'mpirun -np 2 snappyHexMesh -overwrite -parallel' command with 2 processors.

The exact error is:

--> FOAM FATAL ERROR: (openfoam-2112 patch=220310)
Symmetry plane 'midPlane' is not planar.
At local face at (11.1444 0 -0.365325) the normal (0 -1 0) differs from the average normal (0 -0.998033 0) by 3.86859e-06
Either split the patch into planar parts or use the symmetry patch type

From virtual void Foam::symmetryPlanePolyPatch::calcGeometry(Foam::P streamBuffers&)
in file meshes/polyMesh/polyPatches/constraint/symmetryPlane/symmetryPlanePolyPatch.C at line 66.

FOAM exiting

The mesh (vertices) are perfectly located and in theory it have to be perfectly planar. I don't know how to fix it or how to ignore it. I have tried increasing -mergeTol to 0.00001, 0.0001, 0.001, 0.002 and it doesn't solve it.

For more information: The case is a simply tow test with a ship. I'm going to upload an image of the domain and the mesh. In the snappyHexMeshDict I have also defined two refinement boxes around the ship, but I can't see it obviously because the error.

If you have read my complete question, I thank you, I hope you can help me, greetings.
Attached Images
File Type: jpg paraFoam1.jpg (102.0 KB, 23 views)

Last edited by miguelmikk; November 22, 2023 at 05:53. Reason: I haven't been clear enough
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Old   November 23, 2023, 06:37
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Judging from that image, the mesh looks quite distorted, but its hard to see. Can you show a detail of the mesh, e.g. at the position pointed out by the error message?
In general snappy has a hard time handling these flat cells as a background mesh, so I would expect a bad mesh quality resulting on the surface and possibly the symmetryPlane.
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midplane, planar, reconstruct, reconstructparmesh, symmetry

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