Nyquist plot optimization complex value problem

Please login with a confirmed email address before reporting spam

I'm studying the Comsol manual chapter 6 : battery impedance and modeling the positive electrode's impedance nyquist plot. I have a question about optimization process that the form of optimized values change between real number and complex number. When I set the exchange current density of positive electrode i0_pos as the independent variable, I get results as complex numbers. But I get real number values when I optimize i0_pos and other variables simultaneously. When optimizing other variables except for the i0_pos individually, I could get real number values. The first picture is the result when optimizing only i0_pos and the second one is when optimizing i0_pos and cdl_pos(capacitance of positive electrode) at the same time. I think the result should be seen in the real number form regardless of variables because anyway the exchange current density is also a real number value. But the results I get make me confused. I'd like to get explicit answers. Also I tried changing optimizing method from IPOPT to BOBYQA. The problem above showed up only using the IPOPT method. I want to know the reason either.!



0 Replies Last Post 2024年11月4日 GMT+1 03:52
COMSOL Moderator

Hello seoyun park

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.

Reply

Please read the discussion forum rules before posting.

Please log in to post a reply.

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.

Baidu
map