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.

Magnetic diffusion in copper

Please login with a confirmed email address before reporting spam

Dear all, Well, I have some trouble with induced currents by an external magnetic field. Let's say I want to calculate the induced currents and associated magnetic field in a rod (300mm long, 40mm diameter) subject to a ramping field (transverse) of 0.1T/s. If I model the rod alone and apply the external magnetic field as boundary condition (or as reduced field condition), the calculation converges, but of course, I don't take into acount the demagnetization effect of the rod induced currents on itself. If I add a layer of "air" around it, and apply the ramping field at the boundary of the air domain, the calculation fails to converge (Failed to find initial values, Matrix has zero on diagonal). Any other attempt at other boundary conditions (perfect mag. cond. / mag. insul / reduced field etc...) has failed. Has anyone had this type of problem? I'll soon give illustrations of the 2 models (the one that converges and the other). Best, and thanks!


0 Replies Last Post 27 mai 2019, 07:19 UTC−4
COMSOL Moderator

Hello Alexandre Torre

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.