Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
Error: Optimization objective seems to be unbounded. Revise objective, bounds, and scaling.
Posted 13 juil. 2023, 01:02 UTC−4 Chemical, Computational Fluid Dynamics (CFD), Electrochemistry Version 5.6 0 Replies
Please login with a confirmed email address before reporting spam
Hello,
I've modeled a BES coupling transport of diluted species, secondary current distribution and laminar flow. My objective function is an energy efficiency one, so basically eff=work(out)/work(in) which I am attempting to maximize. My control variables are the initial inlet species concentration, initial fluid velocity (which in this case dictates the volumetric flow) and the applied voltage. I've defined the lower and upper bounds yet I keep getting this error message using the BOBYQA solver, yet it appears to go through just fine trying Nelder-Mead. What baffles me is that Nelder-Mead works even if I don't clearly specify the control variable limits. Any suggestions?
Hello Uriel Pedroza-Medina
Your Discussion has gone 30 days without a reply. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help.
If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.