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Issue with RANS optimization of Onera M6 wing

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Old   October 10, 2013, 14:38
Default Issue with RANS optimization of Onera M6 wing
Anant Diwakar
Join Date: Jan 2013
Posts: 68
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I have been trying to do RANS shape optimization on Onera M6 wing
(hybrid coarse mesh) using SU2 v 2.0.5 for quite some time,
but have been unable to do so.

When I see the CD gradient of the RANS case after first design cycle,
it is observed that the gradients are very high.

The values of DV_VALUE_NEW in the config_MDC.cfg file seems to be
very large resulting in a very large mesh deformation and consequently
blowing up of the flow simulation

Can anyone tell how are the values of DV_VALUE_NEW for each control
points are calculated in config_MDC.cfg file for mesh deformation ?

Also, I want to tell that the gradient projection code, SU2_GPC, always
takes the step size of 0.001, whatever be the value given for DV_VALUE_NEW. Why is this happening ?

I am attaching the initial and deformed ffd box plot and .cfg files.

Attached Images
File Type: jpg deformed_ffd_box.jpg (27.5 KB, 12 views)
Attached Files
File Type: txt turb_ONERAM6_opt.cfg.txt (15.4 KB, 3 views)
File Type: txt config_GPC.cfg.txt (6.4 KB, 0 views)
File Type: txt of_grad_cd.plt.txt (564 Bytes, 0 views)
File Type: txt config_MDC.cfg.txt (6.7 KB, 0 views)
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Old   October 11, 2013, 15:44
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Thomas D. Economon
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Hi Anant,

Please see my post over in the other thread:

All the best,
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