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.

Model converges below a certain physical dimension size

Please login with a confirmed email address before reporting spam

Hi,

I'm trying to make a 2-D model of an electrolysis cellwith fluid flow into a 3-D model. All the model parameters remain the same only a depth to the model is added to make it 3-D. If the model is kept physically small like 2x2 mm the model converges. If the model is increased to a size of for example 30x30 mm the model does not converge, and error's are given stating that a matrix is not defined. I'm wondering what causes this effect. I assume this has something to do with the computational load of the model (the kinetics are quite complex).

What is the best method of making the model converge with larger physical dimensions? Should I use some other type of solver (now using the segregated solver)? Should I use some sort of special mesh (now using physics controlled mesh)?

Best,

Alex


0 Replies Last Post 16 Aug 2019, 21:13 BST
COMSOL Moderator

Hello Alex de Jong

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.