| Author | Message | ||
     Umberto Anselmi-Tamburini (tau) New member Username: tau Post Number: 1 Registered: 06-2006 |
I have been using FlexPDE to model complex eletro-thermal problems. Using the CONTACT/JUMP boundary condition I noticed that when the value of the contact resistance is very small FlexPDE has trouble to converge and the results have no physical meaning. Any suggestions on how to deal with this problem? | ||
| Robert G. Nelson (rgnelson) Moderator Username: rgnelson Post Number: 630 Registered: 06-2003 |
One guess is that if you make the resistance too small the other terms in the PDE for the boundary nodes are lost to roundoff, and the PDE is not solved. The limit of very small resistance is, of course, no resistance at all. If your resistance is that small, perhaps you don't need it. Try increasing the resistance until the problem converges cleanly. Then increase it a little more and see if the solution changes. Then try it again with no contact resistance and compare the solutions. |