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Trouble with kOmegaSSTLM

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Old   October 3, 2017, 10:31
Default Trouble with kOmegaSSTLM
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Daniel Ferreira
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Hello, guys.
I'm currently working with a basic case, an airfoil with a separation-induced transition. To solve the laminar separation bubble, I'm using the gamma Retheta transition model.
With the fully turbulent k Omega SST, I do get good results, but with the same mesh and the same boundary conditions with transition model, my simulation do not work.
The problem clearly is in th gamma Retheta, but I couldn't find out the answer for my problem reading the log.
I'm attaching the controlDict, fvSolution, fvSchemes and the log of my simulation.
I hope someone can help me.

Thank you, guys.

log.simpleFoam.tar.gz

solver.tar.gz

Last edited by Duduzao123; October 3, 2017 at 16:29.
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Old   April 11, 2019, 10:47
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Alejandro
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Quote:
Originally Posted by Duduzao123 View Post
Hello, guys.
I'm currently working with a basic case, an airfoil with a separation-induced transition. To solve the laminar separation bubble, I'm using the gamma Retheta transition model.
With the fully turbulent k Omega SST, I do get good results, but with the same mesh and the same boundary conditions with transition model, my simulation do not work.
The problem clearly is in th gamma Retheta, but I couldn't find out the answer for my problem reading the log.
I'm attaching the controlDict, fvSolution, fvSchemes and the log of my simulation.
I hope someone can help me.

Thank you, guys.

Attachment 58791

Attachment 58792
Did u solve ur problem?

Try reducing the relaxationFactors 0.3 for P and 0.7 for the rest.

Also:

div(phi,U) bounded Gauss upwind;

laplacianSchemes Gauss linear limited 0.333;

snGradSchemes limited 0.333;
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Old   August 13, 2022, 07:18
Default Maybe mesh related
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Michael S.
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I also had the same problem.

After hours I found out that the kOmegaSSTLM seems to be more sensitive to the mesh.


After changing the trailing edge from edgy to round the kOmegaSSTLM model works fine, see attached pictures.


Best regards
Michael
Attached Images
File Type: png kOmegaSSTLM-not_ok.png (166.3 KB, 48 views)
File Type: jpg kOmegaSSTLM-ok.jpg (49.7 KB, 56 views)

Last edited by Wowbagger; August 13, 2022 at 07:19. Reason: spelling mistake
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Old   March 5, 2024, 06:09
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Pedro
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Originally Posted by Wowbagger View Post
I also had the same problem.

After hours I found out that the kOmegaSSTLM seems to be more sensitive to the mesh.


After changing the trailing edge from edgy to round the kOmegaSSTLM model works fine, see attached pictures.


Best regards
Michael
I'm beginner on OpenFoam and I would like to know if you can help me with kOmegaSSTLM setup for a VAWT. I don't know what exactly I have to set up on ReTheta.
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Old   March 5, 2024, 16:52
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Quote:
Originally Posted by hmbpedro View Post
I'm beginner on OpenFoam and I would like to know if you can help me with kOmegaSSTLM setup for a VAWT. I don't know what exactly I have to set up on ReTheta.

Hi hmbpedro.

I followed the instructions given (as example) in: https://www.openfoam.com/documentati...ga-sst-lm.html

I also had a look to this video which helped me much in understanding:
https://www.youtube.com/watch?v=5htknS9uVEk

Hope this helps.
Best regards
Michael
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