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diverging issue of sst in supersonic flow

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Old   December 11, 2023, 07:27
Post diverging issue of sst in supersonic flow
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Shukai Wang
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Hi all,
I am a new user and have an issue with the supersonic simulation of SWBLI using sst model, it always diverges with about 50 iterations. Can someone help take a look at my cfg file? I attach it with the thread. Thanks a lot!
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File Type: txt sst cfg.txt (2.5 KB, 8 views)
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Old   December 11, 2023, 09:50
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You have changed many things in the config file. Did you try to run the original V&V testcase with the original geometry?


I see that you have also changed the reference length, so you are running this on another geometry as well. It is therefore very difficult to assess where the problem lies if you do not provide the mesh that you are using.
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Old   December 11, 2023, 10:21
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Shukai Wang
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hi,
yes I have tested the V&V before and it works. For my case, the mach number is higher, but the geometry is quite similar to the V&V. Can you get access to my geo file (i also use Gmsh) and help me debug with this diverging issue? Thanks a lot!
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Old   December 11, 2023, 10:31
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Hi,
I just really struggled with the issue. I will be really APPRECIATED if you can help me take a look to it. A lot of thanks again!
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Old   December 11, 2023, 16:58
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Just go back to the original configuration file and use those settings. Also make sure to check an intermediate result in e.g. paraview to see if there are some local problems in the mesh. You need for instance quite small meshes at the wall to get y^+ close to 1.



You can also first set CFL_ADAPT=NO and set CFL=1.
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