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CFD Online Discussion Forums (https://www.cfd-online.com/Forums/)
-   SU2 Shape Design (https://www.cfd-online.com/Forums/su2-shape-design/)
-   -   Error in optimization of the RAE2822 airfoil with the mesh in the test case (https://www.cfd-online.com/Forums/su2-shape-design/113994-error-optimization-rae2822-airfoil-mesh-test-case.html)

fpalacios May 21, 2013 00:14
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

Tommy Chen May 29, 2013 06:30
Quote:
Originally Posted by diwakaranant (Post 428680)
Hi Francisco

Is the current developer (working RANS case) version available for download ?

Thanks
Anant
Hi Anant

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

Tommy Chen May 29, 2013 06:32
Quote:
Originally Posted by fpalacios (Post 421596)
Hi Anant,

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
Hi Francisco

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

diwakaranant May 30, 2013 02:28
2 Attachment(s)
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

Tommy Chen May 30, 2013 05:09
Quote:
Originally Posted by diwakaranant (Post 430895)
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

Anant

I guess it is due to the absence of the Adjoint_Turbulent_Options , please check the configuration_template.

Tommy

diwakaranant May 30, 2013 05:21
Hi Tommy

Can you share the configuration file ?

Thanks
Anant

diwakaranant May 30, 2013 05:37
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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