******************* This email originates from outside Imperial. Do not click on links and attachments unless you recognise the sender. If you trust the sender, add them to your safe senders list https://spam.ic.ac.uk/SpamConsole/Senders.aspx to disable email stamping for this address. ******************* 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 Sicher versendet mit [Proton Mail](https://proton.me/).