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.
Global constraint
Posted 2009/09/02 8:55 GMT-4 0 Replies
Please login with a confirmed email address before reporting spam
I just wanted to test this and created a 1-d convection and conduction model consisting out of one subdomain with the following boundaries:
Then I defined as described in the example under Options > Integration Coupling Variables > Boundary Variables the variable T_probe with the expression T (point 1 in the example).
Afterwords I defined the global equation Q_0: T_probe-320=0.
When I try to solve the problem the error 7111 Singular matrix appears.
What happens there?
Thanks for comments!
Hello Oliver Ottinger
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.