Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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.

Failed to evaluate variable Jacobian.

Please login with a confirmed email address before reporting spam

Hi all!

I'm a new user of Comsol.
What I'm trying to do is to make a simple model (3D) in which there's a moving magnet placed under a spiral inductor and i want to see the induced voltage across the spiral inductor. The magnet is moving in the y direction. above the spiral inductor there's a sheet of a high permeability material.
I've created an Identity pair (boundaries between the air domain in which the magnet moves and the "fixed" air where the inductor is placed), because as I understood this "layer" needs to make a continuity condition for fields in domain with non-congruent mesh.
I've found similar error in the forum but still don't understand what i'm missing:
The boundary 4 is one of the identity pair.

Failed to evaluate variable Jacobian.
- Variable: mod1.tAx_lmTy
- Geometry: 1
- Boundary: 4

My version is 4.3b i'm solving with MF

tried to attach the file but getting an file error size (maybe too big? 23MB)

thank you!

0 Replies Last Post 9 juil. 2013, 10:45 UTC−4
COMSOL Moderator

Hello Antonio Camarda

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.