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.

Error with high reaction heat

Please login with a confirmed email address before reporting spam

Hello,

I have a problem with solving the heat balance for high reaction heat (-165 KJ/mol, math interface). If I reduce the heat production with factor 100, the simulation works, otherwise I get an error "Undefinded value found. -Detail: Undefined value found in the stiffness matrix. There are 199 equations giving NaN/Inf in the matrix rows for the variable comp1.T. at coordinates: (0), (0.005), (0.01), (0.015),...."
Could anybody give me an advice how to handle this problem?

0 Replies Last Post 2 déc. 2015, 08:56 UTC−5
COMSOL Moderator

Hello Tiziana Carambia

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.