2D Optimization Constraints Not Satisfied

tomp1993 · November 2, 2017, 15:44

HI,
I am running a 2D supersonic aerofoil optimization using the Hicks-Henne type design variables, after finding 2D FFD unsuccessful.
The new HH parametrization is successfully updating the geometry to reduce drag, however the thickness constraint is not satisfied by each resulting design, and after 7-8 design iterations the geometry becomes unfeasible due to extreme surface deformations.
2D-opt-config.txt
Config file attached above, any help would be very greatly appreciated!
Tom.

tomp1993 · January 15, 2018, 11:03

Hi Everyone,
Bumping this thread since i've still not managed to solve this issue.
The Latest copies of the cfg and grid are no longer producing infeasible deformations, but are still not complying with the aerofoil max thickness constraint as specified in the config file.
At this point i'm really struggling to see a way of making this work? any help would be greatly appreciated. unfortunately cannot upload grid file due to size limits.
2D-opt.txt
obj-func-output.txt
history_project.txt
Thanks!
Tom

fpalacios · February 24, 2018, 13:36

Not a bad idea to take a look at the new tutorial... optimization with constraints could be tricky https://su2code.github.io/tutorials/home/

Best,
Francisco

November 2, 2017, 15:44	2D Optimization Constraints Not Satisfied	#1
tomp1993 Member tom pratt Join Date: Jan 2016 Posts: 55 Rep Power: 10	HI, I am running a 2D supersonic aerofoil optimization using the Hicks-Henne type design variables, after finding 2D FFD unsuccessful. The new HH parametrization is successfully updating the geometry to reduce drag, however the thickness constraint is not satisfied by each resulting design, and after 7-8 design iterations the geometry becomes unfeasible due to extreme surface deformations. 2D-opt-config.txt Config file attached above, any help would be very greatly appreciated! Tom.

January 15, 2018, 11:03	Still not solved	#2
tomp1993 Member tom pratt Join Date: Jan 2016 Posts: 55 Rep Power: 10	Hi Everyone, Bumping this thread since i've still not managed to solve this issue. The Latest copies of the cfg and grid are no longer producing infeasible deformations, but are still not complying with the aerofoil max thickness constraint as specified in the config file. At this point i'm really struggling to see a way of making this work? any help would be greatly appreciated. unfortunately cannot upload grid file due to size limits. 2D-opt.txt obj-func-output.txt history_project.txt Thanks! Tom

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February 24, 2018, 13:36		#3
fpalacios Super Moderator Francisco Palacios Join Date: Jan 2013 Location: Long Beach, CA Posts: 404 Rep Power: 15	Not a bad idea to take a look at the new tutorial... optimization with constraints could be tricky https://su2code.github.io/tutorials/home/ Best, Francisco