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Hello Kaloyan Kirilov,

I'm not sure how to reply to your messages via email, so I have to start a new discussion each time.

I want to start by using GMSH to NEKTAR, and then use the peralign module in Nekmesh to align p1 and p2 for rotational periodicity. To pinpoint the problem, I have simplified the mesh to its most basic test state. However, no matter what I try, I am unable to achieve the aforementioned requirements using NekMesh -m peralign; it always results in errors.

Assuming thi .geo file corresponds to a 2D mesh named test.msh, my operations are as follows:

NekMesh test.msh test.xml:xml:uncompress

NekMesh -m peralign:surf1=5:surf2=6:dir=z:rot=PI/6 test.xml test_p.xml

Subsequently, an error occurs:

[ProcessPerAlign] WARNING: Could not find matching edge for surface element 3. Skipping periodic alignment.

I hope I have made myself clear.

Thank you for your assistance.

Best regards,

Yaguang.