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Issue with Discrete Adjoint solver

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Old   August 16, 2021, 15:45
Default Issue with Discrete Adjoint solver
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Hareshram
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Hello, I'm trying perform 3D shape optimization of an underwater flow around a turbine.

The Direct problem is run using INC_RANS solver in a rotational frame and converges to an order of 1e-10.

I created an FFD box around one of the blades and use SU2_CFD_AD to perform the DISCRETE_ADJOINT calculation from the converged solution. The code however fails to start and gives the error, "Killed". I have attached the cfg file as well.

I'm not sure what this error means. Any help will be appreciated. Thanks.



Quote:
------------------- Iteration Preprocessing ( Zone 0 ) ------------------
Discrete adjoint Euler/Navier-Stokes/RANS fluid iteration.
Setting dynamic mesh structure for zone 1.
Setting rotating frame grid velocities for zone 0.
Rotational origin (x, y, z): ( 0, 0, 0 )
Angular velocity about x, y, z axes: ( 0, 0, 9.6975 ) rad/s
Direct iteration: Euler/Navier-Stokes/RANS equation.
Euler/Navier-Stokes/RANS fluid iteration.
Info: Ignoring the following screen output fields:
RMS_RES[0], AVG_BGS_RES[0]
Screen output fields: INNER_ITER, RMS_PRESSURE, TORQUE, AVG_CFL
History output group(s): ITER, TIME_DOMAIN, RMS_RES, ROTATING_FRAME, AERO_COEFF, CFL_NUMBER
Convergence field(s): RMS_PRESSURE
Warning: No (valid) fields chosen for time convergence monitoring. Time convergence monitoring inactive.

------------------------------ Begin Solver -----------------------------

Simulation Run using the Single-zone Driver

-------------------------------------------------------------------------

Direct iteration to store the primal computational graph.
Compute residuals to check the convergence of the direct problem.
Killed
Attached Files
File Type: zip config_rotor.zip (4.2 KB, 3 views)
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Old   August 17, 2021, 08:02
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pcg
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Pedro Gomes
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You are probably running out of ram. The discrete adjoint can use up to 10 times more than the primal.
If you are using multigrid turn it off for the adjoint.
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Old   August 17, 2021, 14:55
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Hareshram
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Thanks! That was my issue.
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