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August 23, 2017, 11:55 |
Adjoint Calculation Error
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#1 |
Member
tom pratt
Join Date: Jan 2016
Posts: 55
Rep Power: 10 |
Hi,
I am running a 2D aerofoil optimization using V5.0.0; the flow solution is converged but each log_adjoint.out file shows the following: Code:
log10[Maximum residual]: -inf. Maximum residual point 0, located at (0, 0). Iter Time(s) Res[Psi_Rho] Res[Psi_E] Sens_Geo Sens_AoA 0 0.524635 -32.000000 -32.000000 0.0000e+00 0.0000e+00 CSysSolve::FGMRES(): system solved by initial guess. Code:
----------------------- Residual Evolution Summary ---------------------- log10[Maximum residual]: -2.83626. Maximum residual point 11866, located at (0.191485, -0.0191805). ---------------------------------------------------------------------- the adjoint gradients are then calculated to be zero (i think as a result of the above issue) any help would be highly appreciated! if more information on the .cfg file or .su2 grid is needed let me know. Many thanks! Tom |
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August 24, 2017, 17:45 |
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#2 |
New Member
Alejandro Quirós
Join Date: Nov 2016
Location: Chiclana, Spain
Posts: 6
Rep Power: 9 |
What are the values you are using in the reduction factors of the CFL? This issue can happen if they are 0 since you'll be using a CFL of 0.
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August 29, 2017, 12:22 |
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#3 |
Member
tom pratt
Join Date: Jan 2016
Posts: 55
Rep Power: 10 |
Hi,
the CFL was positive with a value of around 0.5-1.5. the reduction factors were around 1.0-0.9. I have now gotten around the problem by modifying a cfg file from the NACA0012 steady optimization Testcase for use with my own grid and conditions. However, i am now facing the problem of the design returning to its original condition after a single 'good' design iteration. This issue is being discussed in another Thread. Thanks for the assistance. Tom |
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Tags |
adjoint, ffd 2d optimization su2, gradient, optimization |
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