[Duduzao123]

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

[ancolli]

Originally Posted by Duduzao123

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;

[Wowbagger]

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

[hmbpedro]

Originally Posted by Wowbagger

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.

[Wowbagger]

Originally Posted by hmbpedro

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