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.

Mikic elastic correlation error in thermal contact node

Please login with a confirmed email address before reporting spam

I keep getting an error when trying to model thermal contact.

Division by zero.
- Function: /
Failed to evaluate variable.
- Variable: comp1.ht.tc1.Econtact
- Defined as: ((down(comp1.ht.tc1.Eequ)*up(comp1.ht.tc1.Eequ))/(((1-(up(comp1.ht.tc1.nuequ)^2))*down(comp1.ht.tc1.Eequ))+(up(comp1.ht.tc1.Eequ)*(1-(down(comp1.ht.tc1.nuequ)^2)))))
Failed to evaluate expression.
- Expression: if(((comp1.ht.tc1.Tn==0)||(comp1.ht.tc1.Econtact==0)),0,((comp1.ht.tc1.Tn*1.4142135623730951)/(comp1.ht.tc1.m_asp*comp1.ht.tc1.Econtact)))
Failed to evaluate variable.
- Variable: comp1.ht.tc1.TnRel
- Defined as: if(((comp1.ht.tc1.Tn==0)||(comp1.ht.tc1.Econtact==0)),0,((comp1.ht.tc1.Tn*1.4142135623730951)/(comp1.ht.tc1.m_asp*comp1.ht.tc1.Econtact)))
Failed to evaluate operator Jacobian.
- Operator: if
- Geometry: geom1
- Boundary: 93
- Feature: Stationary Solver 1 (sol1/s1)

I don't see anything wrong with my inputs, though. I put in values for E and the Possion ratio for the Weighted Harmonic Mean, but it treats Eup and Edown as 0? I have no idea where to input those values. I would think it pulls the values from the material properties. In any case, what exactly is it that I am filling in when I put in the value for E and the Poisson ratio in that node?

The boundaries I'm defining are simple -- just a rectangle against another rectangle.

0 Replies Last Post 7 gen 2015, 15:12 GMT-5
COMSOL Moderator

Hello Damian Rivas

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.