When I run the example case in 18_rotor_tower_monopile folder with the IEA15MW_FB_scaled.yaml geometry file, after a while openMDAO output the message
Optimization terminated successfully…
and the run stops.
Then, as I run compare_designs to compare the initial design with the final (optimized) one, I see that the LCoE of the optimized design is higher than the LCoE of the initial design. Is this result really optimal? I mean, LCoE is the merit figure of the optimization, and must be minimized. So, should not I expect that the optimization is successful when LCoE reaches a value lower than the LCoE value of the design I start from?
I am using WISDEM version 3.10.1.
Thank you in advance for your time and attention