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Problem running ONERAM6 analysis on finer grids |
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#1 |
Member
Akash Chaudhari
Join Date: Dec 2012
Location: Pune, India
Posts: 31
Rep Power: 13 ![]() |
Hi,
I am using SU2 v2.0 for completing the tutorials. When running the oneram6 tutorial, the analysis fails to run on any grid other than the coarse hexa grid. There are three other grids provided viz., hybrid coarse, hybrid fine and hexa fine. But on all these grids the analysis throws the following error after some iterations Code:
Negative pressure at point: 0.876234 -0.985696 0.00872704 Negative pressure at point: 0.887721 -0.957623 0.00686946 Negative pressure at point: 0.876234 -0.985696 0.00872704 Negative pressure at point: 0.887721 -0.957623 0.00686946 CSysSolve::modGramSchmidt: w[i+1] = NaN terminate called after throwing an instance of 'int' Aborted (core dumped) [akash.chaudhari@TSPLDEV-11 SU2Py]$ Can someone please help resolve this issue? Thanks. |
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#2 |
Super Moderator
Thomas D. Economon
Join Date: Jan 2013
Location: Stanford, CA
Posts: 271
Rep Power: 14 ![]() |
Hi Akash,
It looks as if the calculation is going unstable (after getting negative pressures, the implicit linear solve breaks down). Have you tried adjusting the CFL and other options, like multigrid, down to more conservative levels? Also, are you using the most recent version of the code? Developer version 2.0.4 contained some notable improvements in the stability of the code, especially when using the Krylov linear solvers. Hope this helps, Tom |
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#3 |
Member
Akash Chaudhari
Join Date: Dec 2012
Location: Pune, India
Posts: 31
Rep Power: 13 ![]() |
Thanks for your reply Tom. I sure will try out the suggestions you mentioned with my current version i.e. v2.0.
For the developer versions, I just merged/overwrote the trunk folder provided in the developer versions(v2.0.5) with the trunk folder of v2.0 and then compiled the code using python script as described in the manual. Hope I did it right and please correct me if I am wrong. The manual being old(v1.1 I guess) and also the python build script, it does not compile the SU2_SOL module and neither could I get any info as to how it would affect my analysis. And I also could not compile the SOL module separately as the process stopped after an error. I hope this module isn't required for any crucial function in the analysis. I will try and post the error as soon as possible. Besides this the code really seems great and I am happy with way it has been converging in no time for my cases. Thanks, Akash |
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#4 |
Senior Member
Cean
Join Date: Feb 2010
Posts: 128
Rep Power: 16 ![]() |
Hi,
I can't compile the sol module on win7 with gcc for win either. I think it is only needed for parallel computation. After finish simulation, sol module sort of Combining the result. Regards, Cean |
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