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Error in optimization of the RAE2822 airfoil with the mesh in the test case |
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April 18, 2013, 13:22 |
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#1 | |
Super Moderator
Francisco Palacios
Join Date: Jan 2013
Location: Long Beach, CA
Posts: 404
Rep Power: 15 |
Quote:
The adjoint RANS capability is a priority for SU2 developers team. For the time being we are developing two techniques: frozen eddy viscosity, and a new technique called hybrid adjoint. Could you please try the new release 2.0.3 using the frozen viscosity adjoint? Best, Francisco |
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April 19, 2013, 02:32 |
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#2 |
Member
Anant Diwakar
Join Date: Jan 2013
Posts: 68
Rep Power: 13 |
Thanks a lot Francisco.
I will try it with SU2 (2.0.3) version. Regards Anant |
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April 19, 2013, 11:54 |
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#3 | |
Member
Tommy Chen
Join Date: Mar 2011
Location: University of Michigan
Posts: 96
Rep Power: 15 |
Quote:
Hi Anant I have tried version 2.0.3 with the mesh and configuration file I uploaded in my last thread, however it still doesn't work well. Is that the same with yours? Regards Tommy |
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April 23, 2013, 05:07 |
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#4 |
Member
Anant Diwakar
Join Date: Jan 2013
Posts: 68
Rep Power: 13 |
Hi Tommy
I tried RANS optimization of RAE2822 airfoil with SU2 2.0.3, but there is an issue regarding adjoint solver convergence. It's not working. Were you able to run this case successfully ? Thanks Anant |
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April 23, 2013, 12:26 |
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#5 | |
Member
Tommy Chen
Join Date: Mar 2011
Location: University of Michigan
Posts: 96
Rep Power: 15 |
Quote:
I have the adjoint solver convergence issue , too The iteration seems to diverge all the time, even when I switch the adj_cfl_rduction factor to be smaller. |
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May 9, 2013, 01:14 |
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#6 |
Member
Anant Diwakar
Join Date: Jan 2013
Posts: 68
Rep Power: 13 |
Hi Tommy
Were you able to run RANS shape optimization case for RAE2822 airfoil using SU2 v 2.0.3 ? If yes, can you share the .cfg file ? Thanks Anant |
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May 13, 2013, 01:07 |
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#7 | |
Member
Tommy Chen
Join Date: Mar 2011
Location: University of Michigan
Posts: 96
Rep Power: 15 |
Quote:
Hi Anant So sorry for my late reply. As your question, I am able to run the RANS shape optimization case for RAE2822 airfoil using SU2 v 2.0.3 , with the modification in .cfg file as Trent proposed. However the ajoint equation seem to diverge all the time no matter how I change the ADJ_CFL_redution factor. Best regards |
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May 15, 2013, 11:08 |
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#8 | |
Super Moderator
Francisco Palacios
Join Date: Jan 2013
Location: Long Beach, CA
Posts: 404
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Quote:
Using the current developer version (available at the end of this week), the attached config file works perfect. We are preparing some tutorials about RANS optimization for the next release 2.1 (mid Jul). Thanks for using SU2, Best, Francisco turb_SA_RAE2822.cfg.zip |
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May 19, 2013, 11:22 |
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#9 | |
Member
Tommy Chen
Join Date: Mar 2011
Location: University of Michigan
Posts: 96
Rep Power: 15 |
Quote:
What is the current developer version (available at the end of this week) ?? Is that v2.0.3??? |
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May 20, 2013, 07:47 |
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#10 |
Member
Anant Diwakar
Join Date: Jan 2013
Posts: 68
Rep Power: 13 |
Hi Francisco
Is the current developer (working RANS case) version available for download ? Thanks Anant |
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May 21, 2013, 00:14 |
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#11 |
Super Moderator
Francisco Palacios
Join Date: Jan 2013
Location: Long Beach, CA
Posts: 404
Rep Power: 15 |
Hi,
The new developer version 2.0.4 is now available. In this version we have improved a lot the stability of the direct solver. Give it a shot and increase the CFL number (Krylov based linear solvers are highly recommended) Cheers, Francisco |
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May 29, 2013, 06:30 |
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#12 | |
Member
Tommy Chen
Join Date: Mar 2011
Location: University of Michigan
Posts: 96
Rep Power: 15 |
Quote:
I could run Su2 v2.0.4 well on rans optimization with airfoils, but when the frozen_vicosity option is NO, the iteration seems to diverge all the time. Have you done a statisfied case with the frozen_viscosity=NO with rans airfoil optimization ? Tommy |
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May 29, 2013, 06:32 |
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#13 | |
Member
Tommy Chen
Join Date: Mar 2011
Location: University of Michigan
Posts: 96
Rep Power: 15 |
Quote:
Could the current version handle the adjoint withle the frozen_viscosity equals to NO ? I have tried but the iteration seems to diverge all the time on a testcase of RAE2822 airfoil. Tommy |
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May 30, 2013, 02:28 |
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#14 |
Member
Anant Diwakar
Join Date: Jan 2013
Posts: 68
Rep Power: 13 |
Hi Tommy
I ran RANS based shape design on RAE2822 airfoil and obtained 2.5 % reduction in drag, I used Frozen viscosity parameters as 'Yes'. I tried to run the case with Frozen viscosity parameter as 'No', but the case was not able to run and gave error after 1st flow solution. The log and configuration file is attached. Thanks Anant |
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May 30, 2013, 05:09 |
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#15 | |
Member
Tommy Chen
Join Date: Mar 2011
Location: University of Michigan
Posts: 96
Rep Power: 15 |
Quote:
Anant I guess it is due to the absence of the Adjoint_Turbulent_Options , please check the configuration_template. Tommy |
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May 30, 2013, 05:21 |
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#16 |
Member
Anant Diwakar
Join Date: Jan 2013
Posts: 68
Rep Power: 13 |
Hi Tommy
Can you share the configuration file ? Thanks Anant |
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May 30, 2013, 05:37 |
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#17 |
Member
Anant Diwakar
Join Date: Jan 2013
Posts: 68
Rep Power: 13 |
Hi Tommy
Are you referring to CONV_NUM_METHOD_ADJTURB parameter ? I am using nearly the same configuration file posted in this link (post no. 18) by Francisco, in which too, this parameter is missing. Even if we don't mention this parameter explicitly, won't SU2 take some default parameter for this variable ? Can you share the configuration file used by you ? Thanks Anant |
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