Hi Alexander, 
The standards steps you would need to ensure are correct.

  1. Have you explicitly stated in Gmsh that the surfaces 700 and 800 are periodic?
  2. Try to add :abstol=1e-8 to the PerAlign call
  3. If you still have the issue - please rename and send us the .msh and .geo to .txt. They are now filtered by Outlook.

I have also just forwarded you the conversation Yaguang about the periodicities in case you cannot find it fully. 
Kind Regards,
Kaloyan




From: nektar-users-bounces@imperial.ac.uk <nektar-users-bounces@imperial.ac.uk> on behalf of Alexander Schukmann <alexander.schukmann@protonmail.com>
Sent: Monday, May 20, 2024 5:15 PM
To: nektar-users <nektar-users@imperial.ac.uk>
Subject: [Nektar-users] NekMesh: Inconsistent triangular face orientation
 

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Hello everybody,

I tried converting a 3D tetra/prism mesh (generated with gmsh) of a simple cylinder from msh to xml using NekMesh. The domain has periodic boundaries along the cylinder axis. However, I receive the following error:

Orientation of triangular face (id = 113069) is inconsistent with face 3 of prism element (id = 55392) since Dir2 is aligned with Dir1. Mesh setup needs investigation
terminate called after throwing an instance of 'Nektar::ErrorUtil::NekError'

I've seen a similar post from May 12th, where it was suggested to try the peralign option, so I used:

NekMesh -m peralign:surf1=700:surf2=800:dir=z:orient CylReD3900.msh CylReD3900.xml

with no success. The two surface IDs 700 and 800 of course refer to the periodic boundary faces.

I attached my msh file and appreciate any help.

All the best
Alex

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