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Poor convergence in Continuous Adjoint

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Old   June 28, 2016, 10:47
Default Poor convergence in Continuous Adjoint
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I am running a transonic case of a arbitrary body in a transonic flow to try and reduce the drag. The direct N-S (w/ SA) equations are solved fairly well, with residuals dropping to at least 10^-6. I have tried multiple numerical schemes to compare convergence rates and accuracy for the N-S. (All schemes compare well with one another)

The grid was built in pointwise with a structured surface mesh and TREX was used to build the grid in the BL. First point off the wall has y+ under 1.0. Stretching ratio of 1.2. ~10 million cells (5 million are hex). This grid has had good results in other solvers.

When I switch to the Cont. Adjoint, I get poor convergence and varying numerical scheme and CFL does not seem to improve the convergence. Has anyone had a similar problem? Any advice? My config and residuals history is attached.

(Note: This case was a restart, I raised the number of linear solver iterations)
Attached Images
File Type: png residuals.png (4.8 KB, 23 views)
Attached Files
File Type: txt transonic-ffd_cfg.txt (33.7 KB, 8 views)
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adjoint, convergence, su2

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