Error when importing cgns mesh created with numeca

Pe2 · May 14, 2009, 04:58

Hi

I do some turbomachinery simulations. For grid generation I use numeca, and for the simulation I use CFX11.

Numeca creates the mesh in cgns.

When I import the mesh I always several error messages of this type:

Code:

GTMAPI::importmeshToModel - The importing process reported the following warning(s) while importing
the mesh from the requested file:

  Unable to map nodes in interface "bc_6" between Zone "row_1_flux_1_Blade_1_down"
  and "row_1_flux_1_Blade_1_up" as the not all nodes could be equivalenced.

The simulation runs and I don't think I have any issues with this problem, but I am not sure.

So my question is: Have anyone else had this problem? Do you know what causes this? And does it influence the simulation result?

ghorrocks · May 14, 2009, 19:30

Hi,

I think this error is saying it can't equivalence nodes across a periodic boundary. If the nodes across the periodic boundary don't match then ignore the error and use a GGI periodic boundary. If they should match then you will probably adjust the equivalencing tolerance so they match. Then you will be able to use a 1to1 periodic boundary and this is faster and more accurate - but not a show stopper if you can't do it.

Glenn Horrocks

May 14, 2009, 04:58	Error when importing cgns mesh created with numeca	#1
Pe2 New Member Petter Join Date: May 2009 Posts: 1 Rep Power: 0	Hi I do some turbomachinery simulations. For grid generation I use numeca, and for the simulation I use CFX11. Numeca creates the mesh in cgns. When I import the mesh I always several error messages of this type: Code: GTMAPI::importmeshToModel - The importing process reported the following warning(s) while importing the mesh from the requested file: Unable to map nodes in interface "bc_6" between Zone "row_1_flux_1_Blade_1_down" and "row_1_flux_1_Blade_1_up" as the not all nodes could be equivalenced. The simulation runs and I don't think I have any issues with this problem, but I am not sure. So my question is: Have anyone else had this problem? Do you know what causes this? And does it influence the simulation result?

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May 14, 2009, 19:30		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,854 Rep Power: 144	Hi, I think this error is saying it can't equivalence nodes across a periodic boundary. If the nodes across the periodic boundary don't match then ignore the error and use a GGI periodic boundary. If they should match then you will probably adjust the equivalencing tolerance so they match. Then you will be able to use a 1to1 periodic boundary and this is faster and more accurate - but not a show stopper if you can't do it. Glenn Horrocks