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Objective function increases after decreasing

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Old   March 15, 2017, 06:47
Default Objective function increases after decreasing
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Hello guys,

I run a simulation whereby the drag has to be optimized. Which is done for the first +- 60 designs ( 'NIT' = 8 ). However after this point the objective function (drag) increases again. I checked the residuals of the direct- and adjoint calculations, both were nicely converged.
At this point, I don't know what is happening inside 'the black box' and any help is welcome. I would like to know why the objective function is increasing after a couple of 'NIT'. Also, some tips to avoid this behavior are welcome .

Kind regards,


(config file: turb_SA_RAE2822.txt )
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