Issue with Named Selections and Markers when Converting Mesh from ANSYS to SU2 Format

bgulzar22 · December 2, 2023, 04:04

Hello SU2 community,

I am currently facing an issue with the mesh conversion process from ANSYS to SU2 using Gmsh as an intermediate step. I have created a mesh in ANSYS, assigned named selections, and exported the mesh file in CGNS format. However, when I use Gmsh to convert the mesh to SU2 format and open the resulting mesh file, I notice that there are no markers.

Here are the key steps I followed:

Created a mesh in ANSYS and assigned named selections.
Exported the mesh file in CGNS format.
Used Gmsh to convert the CGNS mesh to SU2 format.
I expected to see markers corresponding to the named selections in SU2, but they are not present.

Has anyone encountered a similar issue before? Am I missing a crucial step in the conversion process? Your insights and suggestions would be greatly appreciated.

Thank you in advance!

bigfootedrockmidget · December 2, 2023, 06:42

Why use gmsh in the conversion? You can just load the cgns directly into SU2. You can then also use SU2 to write a .su2 file if you really want that.
I also have trouble keeping the boundary information, it is a real pain converting meshes.

bgulzar22 · December 2, 2023, 07:01

Quote:

Originally Posted by bigfootedrockmidget

Why use gmsh in the conversion? You can just load the cgns directly into SU2. You can then also use SU2 to write a .su2 file if you really want that.
I also have trouble keeping the boundary information, it is a real pain converting meshes.

Still , I don't get the boundary markers. Instead error message shows up as following
"The configuration file doesn't have any definition for marker SURFACE_BODY_1_1_1D!"

bigfootedrockmidget · December 2, 2023, 09:03

that message means that this boundary name is in the cgns, but you did not define a boundary condition for it in the config file.

you should define a boundary condition for it like

Code:

MARKER_HEATFLUX=(SURFACE_BODY_1_1_1D,0)

If you did not expect this boundary to be present, then you have to go back to ANSYS and see where this boundary is.

bgulzar22 · December 3, 2023, 02:47

Quote:

Originally Posted by bigfootedrockmidget

that message means that this boundary name is in the cgns, but you did not define a boundary condition for it in the config file.

you should define a boundary condition for it like

Code:

MARKER_HEATFLUX=(SURFACE_BODY_1_1_1D,0)

If you did not expect this boundary to be present, then you have to go back to ANSYS and see where this boundary is.

Thank you so much for your insights.

December 2, 2023, 04:04	Issue with Named Selections and Markers when Converting Mesh from ANSYS to SU2 Format	#1
bgulzar22 Member Sean Join Date: May 2023 Posts: 52 Rep Power: 3	Hello SU2 community, I am currently facing an issue with the mesh conversion process from ANSYS to SU2 using Gmsh as an intermediate step. I have created a mesh in ANSYS, assigned named selections, and exported the mesh file in CGNS format. However, when I use Gmsh to convert the mesh to SU2 format and open the resulting mesh file, I notice that there are no markers. Here are the key steps I followed: Created a mesh in ANSYS and assigned named selections. Exported the mesh file in CGNS format. Used Gmsh to convert the CGNS mesh to SU2 format. I expected to see markers corresponding to the named selections in SU2, but they are not present. Has anyone encountered a similar issue before? Am I missing a crucial step in the conversion process? Your insights and suggestions would be greatly appreciated. Thank you in advance!

December 2, 2023, 09:03		#4
bigfootedrockmidget Senior Member bigfoot Join Date: Dec 2011 Location: Netherlands Posts: 585 Rep Power: 17	that message means that this boundary name is in the cgns, but you did not define a boundary condition for it in the config file. you should define a boundary condition for it like Code: MARKER_HEATFLUX=(SURFACE_BODY_1_1_1D,0) If you did not expect this boundary to be present, then you have to go back to ANSYS and see where this boundary is.

December 2, 2023, 06:42		#2
bigfootedrockmidget Senior Member bigfoot Join Date: Dec 2011 Location: Netherlands Posts: 585 Rep Power: 17	Why use gmsh in the conversion? You can just load the cgns directly into SU2. You can then also use SU2 to write a .su2 file if you really want that. I also have trouble keeping the boundary information, it is a real pain converting meshes.