Error "Size of velocity boundaryTypeMap does not match number of boundary IDs in mesh!".

[isurug1997]

Dear Neks,
I am trying to run a custom periodic turbulent pipe case with a custom mesh on Nek. Once I convert the .msh file from GMSH to .re2 (following the documentation file) and try running nek, it gives me the following error.

"Error in nrsSetup: Size of velocity boundaryTypeMap does not match number of boundary IDs in mesh!".

It might be a simple fix, but I would really appreciate it if someone who might have faced this issue previously could shed some light on a way around this.

Yours sincerely,
Isuru Gunaratne.

[stgeke]

The number of entries in boundaryTypeMap has to match the non-periodic Physical Surface defined in GMSH.

[isurug1997]

Thank you so much for your response.
In my GMSH file, I have three Physical Surfaces defined (inlet, outlet, wall & flowdomain respectively). The inlet and the outlet are periodic (defined as a periodic boundary pair upon converting the .msh file to the .re2 file). Does it mean that in the .par file, I have to input "boundaryTypeMap = wall, flowdomain" respectively to boundaryTypeMap under the [VELOCITY] section to correctly define the non-periodic Physical Surfaces?

[stgeke]

The mesh converter will translate the GMESH Physical Surface into nek boundaryIDs. In your case there should only be one (periodic faces are not real boundaries), so you want to use e.g. boundaryTypeMap = wall

[isurug1997]

Thank you so much for your quick response.

This was the initial setting that was set in the .par file when I started to get this error (boundaryTypeMap = wall). I have been using the example case files (.usr, .udf, .par, .oudf, etc.) of the case "turbPipePeriodic" provided in nekRS and the only change I made was replacing the .re2 file with my mesh.
As I thought it could be an issue with the NEK tool (gmsh2nek), I just updated my NEK5000 files from GitHub, converted the given .geo file of the example (turbPipe.geo) to .re2, and ran the example case. I am still getting the same error that I have been getting from my custom mesh case. There are no errors when I am running the .re2 file provided in the example case directly (turbPipe.re2).

My apologies for my extended response.

[stgeke]

My bad, you have to use boundaryTypeMap = none, none, wall (assuming boundary 1 and 2 are periodic).

[isurug1997]

Again, thank you so much for your swift correspondence.

I apologize, but despite the above correction to the .par file, the error still persists. Yes, I have set boundary 1 (inlet) and boundary 2 (outlet) as the periodic boundary pair.

I really appreciate your assistance so far with this.