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Old   May 15, 2022, 11:58
Exclamation Not going for second design
  #1
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Zahra
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Hi everyone,
I am learning optimisation with SU2, and for the first step, I ran the tutorial. It finally gave me 35 designs.
But when I substitute my own mesh for the tutorial's mesh, I'd just have one design, and after completing the first design, the optimisation will be terminated.

I'd appreciate it if someone could give me any advice about this matter.
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Old   May 17, 2022, 08:26
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bigfoot
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Hi,
Do you use the new FADO framework for optimization?
example: https://su2code.github.io/tutorials/Species_Transport/


There are many things that can cause the adjoint optimization to fail.

First, you have to make sure that the primal is converged. Is this the case?

Then the adjoint needs to be converged.
Ten the deformation of the mesh should lead to a valid new mesh, if the deformation is too large, the mesh will become invalid.


Do you know where in this process you run into problems? For instance, do you get a new, deformed geometry after the first design iteration or not?
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Old   May 18, 2022, 11:25
Exclamation Problem with second design
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Zahra
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Hello,
Thank you so much for your answers.
Yes, exactly I initially used the Constrained Shaped Design of a Turbulent transonic airfoil which is here: https://su2code.github.io/tutorials/...ained_RAE2822/.

Then without changing anything in the configuration file, I just substitute my own mesh.

The deformation file is not generated but it just gives me one successful and converged flow simulation and thereafter it stops and does not continue and go for the second design.

And in the file "DESIGNS>DSN_001>DIRECT>log_Direct.out."
I have this section:

----------------------------- Solver Exit -------------------------------
All convergence criteria satisfied.
+-----------------------------------------------------------------------+
| Convergence Field | Value | Criterion | Converged |
+-----------------------------------------------------------------------+
| rms[Rho] | -5.63552 | < -3 | Yes|
| Cauchy[CL] | 9.6812e-07 | < 1e-06 | Yes|
+-----------------------------------------------------------------------+
--------------------------------------------------------------------------


Many thanks again for your answer and attention.

Last edited by Zahra_m; May 18, 2022 at 19:45.
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Old   May 18, 2022, 15:06
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Zahra
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Hello,
Thank you so much for your answers.
Yes, exactly I initially used the Constrained Shaped Design of a Turbulent transonic airfoil which is here: https://su2code.github.io/tutorials/...ained_RAE2822/.

Then without changing anything in the configuration file, I just substitute my own mesh.

It seems that it is not failing. It just gives me one successful and valid mesh, which has a tiny difference from the original mesh, and thereafter it stops and does not continue and goes for the second design.

And in the file "DESIGNS>DSN_001>DIRECT>log_Direct.out."
I have this section:

----------------------------- Solver Exit -------------------------------
All convergence criteria satisfied.
+-----------------------------------------------------------------------+
| Convergence Field | Value | Criterion | Converged |
+-----------------------------------------------------------------------+
| rms[Rho] | -5.63552 | < -3 | Yes|
| Cauchy[CL] | 9.6812e-07 | < 1e-06 | Yes|
+-----------------------------------------------------------------------+
--------------------------------------------------------------------------


Many thanks again for your answer and attention.
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Old   November 9, 2022, 03:50
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Hello,
I have encountered the same problem. How can I solve it?
Design variable (FFD_CONTROL_POINT_2D) number 0.
DRAG gradient : 2.66888e-10
-------------------------------------------------------------------------

Design variable (FFD_CONTROL_POINT_2D) number 1.

DRAG gradient : 2.66888e-10
-------------------------------------------------------------------------

Design variable (FFD_CONTROL_POINT_2D) number 2.
DRAG gradient : 2.66888e-10
-------------------------------------------------------------------------

Design variable (FFD_CONTROL_POINT_2D) number 3.
DRAG gradient : 0
-------------------------------------------------------------------------

Design variable (FFD_CONTROL_POINT_2D) number 4.
DRAG gradient : 0

----------------------------- Solver Exit -------------------------------
All convergence criteria satisfied.
+-----------------------------------------------------------------------+
| Convergence Field | Value | Criterion | Converged |
+-----------------------------------------------------------------------+
| rms[A_Rho]| -12.0357| < -12| Yes|
+-----------------------------------------------------------------------+

To adjust the mesh deformation size, adjust DV_ VALUE?
At the end of my configuration file run, no DEFORM file was generated and the SU2_DEF program was not called.
I would be grateful if anyone could give me any advice on this matter.
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