ADJOINT problem and RANS/NAVIER_STOKES solver does not work

[CipollinoDuck]

Hello everyone,

I ask here because I cannot find any solution elsewhere.

I am attempting an Adjoint Optimization problem with viscous solver (RANS/NAVIER_STOKES) using the shape_optimization.py script but I can't complete it because I receive the following message:

Error in "void CSolver::Read_SU2_Restart_Binary(CGeometry*, const CConfig*, std::__cxx11::string)":
-------------------------------------------------------------------------
Unable to open SU2 restart file solution_adj_cd.dat

With EULER solver it works fine, it creates the solution_adj_*.dat files everytime it runs the ADJOINT problem so, at the beginning, the process does not require any further file besides the .su2 and the .cfg ones.

Even the Constrained shape design of a transonic turbulent airfoil tutorial does not work. The required files (initial solution files for the solver and adjoint solution_flow.dat, solution_adj_cd.dat, and solution_adj_cmz.dat) are given from the beginning and if they are not added to the path in which the tutorial will be run, it cannot be completed.

I also tried the turb_ONERAM6 Test case and personal files as well.

Furthermore, I tried to cheat (?) creating a solution_adj_cd.dat and solution_adj_cmz.dat files from the EULER ADJOINT problem because it was the only way I had to obtain that file: the RANS ADJOINT problem performed better than expected reaching a feasible geometry which is not the one obtained in the tutorial.

I do not get why I have this problem, if it is correct or not. Has anyone experienced this before?

Actually, I think I will run this kind of problem with the cheating (?) procedure described before because I need to go ahead with the work and it seems to work relatively fine.

In conclusion, the ADJOINT problem with RANS/NAVIER_STOKES solver does not work because it needs solution_adj_*.dat which are created autonomously with EULER solver.

I am using SU2 V7.2.1 but I also tested them with versions from this to 7.0.0.

The files from the tutorial without solution_*.dat files:
turb_SA_RAE2822.zip

Personal files:
naca0012_8_1_0_700.zip

The command that I use is: python shape_optimization.py -n 8 -g CONTINUOUS_ADJOINT -o SLSQP -f used_file.cfg

UPDATE: I also compiled the code in Ubuntu 20.04 enabling the DISCRETE_ADJOINT functionality but I always receive the same message.

How can I create those solution_adj_*.dat files to start the ADJOINT problem?

Have I missed something written in other tutorials?

Thank you very much for all of the support.

[pcarruscag]

I can't unzip either of your files.
I tried the RAE2822 tutorial and it works with both DISCRETE_ADJOINT and CONTINUOUS_ADJOINT.

[CipollinoDuck]

Hi Pedro,
Thank you for your reply.

I used WinRAR just now and the unzip worked fine even on my phone.

Have you tried to run the tutorial without the restart_adjoint files? I ask you this because I have found the problem without using them since they are case sensitive. I found that I am not the only one facing this problem.

I managed to run the simulations running a Direct solution using RANS/NAVIER-STOKES solvers and a first iteration of the CONTINUOUS/DISCRETE ADJOINT problem using EULER solver for every constraint function used. With this procedure I generated the restart_adjoint files to run the RANS/NS adjoint problem.

Is there any regular procedure to generate those files since neither shape_optimization.py and the manual procedure can?

[pcarruscag]

Ok I understand the issue now:
The NS continuous adjoint solver tries to load a restart even with RESTART_SOL = NO.
It will be fixed shortly in #1476