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.
Time dependent study crashes at missing thermal resistance parameter
Posted 01.04.2019, 08:31 GMT-4 Heat Transfer, Parameters, Variables, & Functions, Studies & Solvers Version 5.3a 0 Replies
Please login with a confirmed email address before reporting spam
Hey guys,
i encountered a weird problem regarding a time dependent study solving heat transfer in terms of thermal resistance intersections. First of all, im working with Comsol 5.3a and a stationary solver succeeds the problem. However, applying time dependent heat transfer values by unchanged thermal resistance values, the solver crashes telling me the variable "comp1.ht.tl1.ds" is undefined. After a short investigation, i found out that this variable is supposed to declare the layer thickness of the applied thermal resistance surface. My question now is, why comsol tries to find such a value for time dependent studies whily stationary solver do not AND why the module does not provide any possibility to enter a layer thickness. How am i supposed to provide variables when comsol does not even demand them? I can only enter the resistance value and no layer thickness .....
Even though, i found a workaround declaring the missing layer thickness as an global variable and setting the thickness to very small values. Might this cause any problems concerning solver accuracy ?
Best Regards, Max
Hello Maximilian Stiegler
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.