Menu

Discussion Forum

New Discussion
Filtrer

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.

Undefined value found in the equation residual vector.

Posted 5 juin 2020, 05:32 UTC−4 Computational Fluid Dynamics (CFD), Battery Design, Electrochemistry Version 5.5 0 Replies

Xiaoqiang zhang
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Undefined value found.

  • Detail: Undefined value found in the equation residual vector.
  • There are 66 degrees of freedom giving NaN/Inf in the vector for the variable comp1.phil. at coordinates: (0.00825542,0.00128606,0.005028), (0.008,0.001,0.005028), (0.008,0.0014,0.005028), (0.00825542,0.00128606,0.00503061), (0.008,0.001,0.00503061), ...

There are 66 degrees of freedom giving NaN/Inf in the vector for the variable comp1.phis. at coordinates: (0.00825542,0.00128606,0.005028), (0.008,0.001,0.005028), (0.008,0.0014,0.005028), (0.00825542,0.00128606,0.00503061), (0.008,0.001,0.00503061), ...

I solve a multiphysics coupled SOFC with mass, heat, momentum transfer, and electrochemical reaction.

It solved smoothly with electrochemical and momentum transport and also solved with anode mass transport.However, when I coupled mass transfer of cathode it reports an error like above.

When I decoupled reaction in cathode mass transport, it solved. When I reduce the reaction multiply by 0.1 it also solved. Increase reaction will cause the same error.

Besides, the coordinates don't in the solution domain. I wonder if anyone could help me to figure out what should I do without compromise in reduced reaction in mass transport?

Also, When I use reduced reaction coupled with heat transfer, the same error appeared.

The cathode anode and electrolyte are just 20, 30, and 8 um thick.

With great appreciation.

Kind regards,

Xiaoqiang

0 Replies Last Post 5 juin 2020, 05:32 UTC−4
COMSOL Moderator

Hello Xiaoqiang zhang

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.

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.

Suggested Content