[taxalian]

Hi SU2 users,
I am using the current version "SU2_Rev1206". I have a nicely converged solution and i want to run the solution for another flow angle by using the previous solution as restart one, it works well with SA turbulence model. But know i am testing the SST model. So i turned on the parameter:


% Restart solution (NO, YES)
RESTART_SOL= YES % NO

The solver successfully reads the "restart_flow.dat" but it cannot initialize/obtain the residual values of turbulent kinetic energy and specific dissipation, see the error below:

------------------------------ Begin solver -----------------------------

Iter Time(s) Res[Rho] Res[kine] Res[omega] CLift(Total) CDrag(Total)
1 8.322500 -0.069912 nan nan 0.469435 0.042631

------------------------------------------------------------------------

Even though the turbulence values are very nicely converged.
I also don't find any configuration parameter that can be seen during the solver run as follows:

------------------------------------------------------------------------
Free-stream turb. kinetic energy (non-dimensional): 4.2525e-05
Free-stream specific dissipation (non-dimensional): 60.699
------------------------------------------------------------------------
May be these values are obtained internally or they might be available in the next version release.
Sometimes it also helps by changing these values in case of convergence problem or restart solutions.

Thanks and Regards.

[fpalacios]

Hi,

The SST implementation is in a V&V stage. Please follow our twitter account @su2code if you want to be informed about the most recent activity in turbulence modeling.

Best,
Francisco

[taxalian]

Hi Fransico,
Thanks for your reply, well as you know from my earlier thread titled "Overpredicted Trailing Edge Separation", where you also posted some replies. I have successfully validated the trailing edge separation test case, i got pretty descents result compared to experiments and CFL3D predictions.

http://turbmodels.larc.nasa.gov/naca4412sep_val.html.

I would also like to perform the V&V for the SST turbulence model too, but due to this problem, i am not able to run the simulation at desired flow angle.

I will post my complete results on the forum and let me know how can i submit these results in your V&V stage of NACA airfoil trailing edge separation.

[Amrita Lonkar]

Hi,

We are very interested in displaying your results of the V&V of the trailing edge separation over a NACA 4412 airfoil. If you have some time, could you please send us your results along with a short write along the lines of this test case:

http://adl.stanford.edu/docs/display...ulent+RAE+2822

We will add it to the test case folder under your name.

Thank you for offering to help with the V&V of the SST model. I will need to look into the issues you're getting in more detail and get back to you when we have it resolved.

Thanks,
Amrita

[taxalian]

Hi Amrita,
Sure, i will send you the results. I will give you the SA results for this test case, as i still don't have the time to perform the SST computations. Let me know how do you want to have the results. In the form of presentation or what else.

Thanks and regards.

[taxalian]

Hi Amrita,
I would like to say that the SST problem is resolved and i am finished with the SST computation and the results seems to be looking very good in terms of the Cp distribution, but of course i need to the similar post-processing i did for the SA turbulence model. I will try to provide you the test case details according to the template as you mentioned in your earlier post.

Thanks.

[Amrita Lonkar]

Hi,

If you could email us the results with a short description of the problem, the configuration options you used to solve it, and a picture of the mesh you used with the boundary conditions, that will be very nice. We will then add the test case on our website. Thank you.

I am glad that you have been able to fix the issue with SST restart, and we are extremely interested in a validation study using the SST turbulence model, so if you have any luck, please contact us and we will add a test case on the website for this too.

Thanks again for your interest in SU2,

Amrita