CGNS Reader cannot handle more than 1 zone?

northfly · July 11, 2018, 23:57

I output CGNS file from ICEM-CFD with 3.1ADF option. The mesh is airfoil with multi-block conversion.

but looks like SU2 cannot handle, if zone number is limited to 1, then SU2 is almost useless.

Can anybody tell me how can I output mesh from ICEM-CFD to SU2? what format and what procedures? Thank you very much!

northfly · July 12, 2018, 09:24

I am guessing SU2 is a unstructured solver, so I need convert the mesh to unstructured form and then output to CGNS, and some lower version say 2.4 CGNS. Is this so?

TKatt · July 17, 2018, 05:47

Hi,

as you said the you have to convert the mesh to an unstructured mesh (SU2 = Stanford University Unstructured

). I use CGNS 3.1 ADF as export from ICEM and didn't have any problems so far. You can either use the .cgns mesh directly in SU2 or convert the mesh to the native .su2 format (see https://su2code.github.io/tutorials/Inviscid_Wedge/). Note though, that the mesh for the solver has to be in meters [m].

Regards, Tobi

northfly · July 25, 2018, 08:58

Thank you very much Tkatt!

northfly · July 26, 2018, 21:10

Quote:

Originally Posted by TKatt

Hi,

as you said the you have to convert the mesh to an unstructured mesh (SU2 = Stanford University Unstructured

). I use CGNS 3.1 ADF as export from ICEM and didn't have any problems so far. You can either use the .cgns mesh directly in SU2 or convert the mesh to the native .su2 format (see https://su2code.github.io/tutorials/Inviscid_Wedge/). Note though, that the mesh for the solver has to be in meters [m].

Regards, Tobi

When you use ICEM t0o output, how do you set those options?
Create default BC patches? Yes/No?
Entities to use for BC patch? Face Elements/Nodes?
Create Bar and node elements? Yes/No?
Thanks!

TKatt · August 30, 2018, 03:42

Hi,

I stick with the (default) options: [No | Nodes | No].
In order to adress the boundaries through the cfg file I create named "Parts" in ICEM.

Sorry for the late reply, I didn't notice your followup question.

Regards Tobi

tomaspzapico · April 24, 2024, 04:11

Hello,

I al having problems using both the .cgns mesh and the converter embedded into SU2. My mesh is a multi-zone mesh and whenever I try to run the SU2_DEF or the SU2_CFD with the multizone option activated, the following message appears:"CGNS reader currently expects only 1 zone per CGNS file.Multizone problems can be run with separate CGNS files for each zone."

Does anybody know how can I fix this problem?

bigfootedrockmidget · April 25, 2024, 16:00

I think you just have to split the cgns into separate cgns files for each zone.

July 11, 2018, 23:57	CGNS Reader cannot handle more than 1 zone?	#1
northfly Member David Join Date: Feb 2013 Posts: 38 Rep Power: 13	I output CGNS file from ICEM-CFD with 3.1ADF option. The mesh is airfoil with multi-block conversion. but looks like SU2 cannot handle, if zone number is limited to 1, then SU2 is almost useless. Can anybody tell me how can I output mesh from ICEM-CFD to SU2? what format and what procedures? Thank you very much!

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July 12, 2018, 09:24		#2
northfly Member David Join Date: Feb 2013 Posts: 38 Rep Power: 13	I am guessing SU2 is a unstructured solver, so I need convert the mesh to unstructured form and then output to CGNS, and some lower version say 2.4 CGNS. Is this so?

July 17, 2018, 05:47		#3
TKatt Member na Join Date: Jul 2018 Posts: 83 Rep Power: 7	Hi, as you said the you have to convert the mesh to an unstructured mesh (SU2 = Stanford University Unstructured ). I use CGNS 3.1 ADF as export from ICEM and didn't have any problems so far. You can either use the .cgns mesh directly in SU2 or convert the mesh to the native .su2 format (see https://su2code.github.io/tutorials/Inviscid_Wedge/). Note though, that the mesh for the solver has to be in meters [m]. Regards, Tobi

July 25, 2018, 08:58		#4
northfly Member David Join Date: Feb 2013 Posts: 38 Rep Power: 13	Thank you very much Tkatt!

August 30, 2018, 03:42		#6
TKatt Member na Join Date: Jul 2018 Posts: 83 Rep Power: 7	Hi, I stick with the (default) options: [No \| Nodes \| No]. In order to adress the boundaries through the cfg file I create named "Parts" in ICEM. Sorry for the late reply, I didn't notice your followup question. Regards Tobi

April 24, 2024, 04:11		#7
tomaspzapico New Member Tomas Perez Zapico Join Date: Mar 2023 Posts: 14 Rep Power: 3	Hello, I al having problems using both the .cgns mesh and the converter embedded into SU2. My mesh is a multi-zone mesh and whenever I try to run the SU2_DEF or the SU2_CFD with the multizone option activated, the following message appears:"CGNS reader currently expects only 1 zone per CGNS file.Multizone problems can be run with separate CGNS files for each zone." Does anybody know how can I fix this problem?

April 25, 2024, 16:00		#8
bigfootedrockmidget Senior Member bigfoot Join Date: Dec 2011 Location: Netherlands Posts: 529 Rep Power: 17	I think you just have to split the cgns into separate cgns files for each zone.