SU2 Divergence Criteria

hilmialf · April 26, 2019, 00:47

Hi.

I am a CFD newbie and this is my first post. I hope someone can give me some enlightment.

I have a question regarding the SU2 divergence criteria, since in some cases I just think that it is still reasonable (this is indeed from my own perspective. I am sorry if it is wrong) to have that value yet SU2 just decide to end the process. So what is this divergence criteria that makes su2 stop running? I would like to also know if there is any way to modify this divergence criteria.

Best regards,
Hilmi

wallym · May 10, 2019, 05:58

Hi Hilmi,

We are glad you are using SU2 and thank you for reaching out!

To answer your question, SU2 only exits due to convergence when either NaN's or Infs are passed into a check residual function (I believe). Unfortunately I have reached residuals in the 100s before. This indeed can be annoying when you cant watch your residuals develop.

In your case, I think the best way to handle this would be to alter the GetConvergence() function. You can set a flag causing SU2 to stop if Res[Omega] > Some number.

Please let me know if this works! Let me know.

Best,
Wally

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
PEMFC model with FLUENT	brahimchoice	FLUENT	22	April 19, 2020 15:44
SU2 Divergence Problem	Gui_AP	SU2	5	February 21, 2020 11:10
[ANSYS Meshing] Help with element size	sandri_92	ANSYS Meshing & Geometry	14	November 14, 2018 07:54
fluent divergence for no reason	sufjanst	FLUENT	2	March 23, 2016 16:08
Divergence problem	Smaras	FLUENT	13	February 21, 2013 05:03

May 10, 2019, 05:58		#2
wallym Senior Member Wally Maier Join Date: Apr 2019 Posts: 123 Rep Power: 7	Hi Hilmi, We are glad you are using SU2 and thank you for reaching out! To answer your question, SU2 only exits due to convergence when either NaN's or Infs are passed into a check residual function (I believe). Unfortunately I have reached residuals in the 100s before. This indeed can be annoying when you cant watch your residuals develop. In your case, I think the best way to handle this would be to alter the GetConvergence() function. You can set a flag causing SU2 to stop if Res[Omega] > Some number. Please let me know if this works! Let me know. Best, Wally