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What's the meaning of "scaling factor" in the optimization configure file?

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Old   February 2, 2018, 10:19
Question What's the meaning of "scaling factor" in the optimization configure file?
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Bingfei
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Hi all,

I'm trying the ONERA M6 optimization in SU2. When I'm reading the inv_ONERAM6_adv.cfg file. I don't understand the exact meaning of "scaling factor" in the configure file. For example:

% Optimization objective function with scaling factor
% ex= Objective * Scale
OPT_OBJECTIVE= DRAG * 0.1
%
% Optimization constraint functions with scaling factors, separated by semicolons
% ex= (Objective = Value ) * Scale, use '>','<','='
OPT_CONSTRAINT= (LIFT > 0.2864) * 10.0; (MAX_THICKNESS_SEC1 > 0.0570) * 0.1; (MAX_THICKNESS_SEC2 > 0.0513) * 0.1; (MAX_THICKNESS_SEC3 > 0.0457) * 0.1; (MAX_THICKNESS_SEC4 > 0.0399) * 0.1; (MAX_THICKNESS_SEC5 > 0.0343) * 0.1
%

What's the meaning of the value that DRAG, LIFT, MAX_THICKNESS multiply?

And same:

% FFD_CONTROL_POINT ( 7, Scale | Mark. List | FFD_BoxTag, i_Ind, j_Ind, k_Ind, x_Mov, y_Mov, z_Mov )

What's the exact meaning of the "Scale" here? And what's the difference between these "Scale"?

Any hint will be welcome! Thank you!

Bingfei
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Old   February 24, 2018, 14:29
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Francisco Palacios
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The new shape tutorials explain the optimization parameter a little bit better,

https://su2code.github.io/tutorials/home/

Best,
Francisco
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