Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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.

Heat Transfer, Joule Heating, 1D Plot Global

Please login with a confirmed email address before reporting spam

Hello,

I have a following problem.
I use the module “Joule Heating”, and I want to calculate a resistance in the temperature dependence (“Time Dependent Study”).
How can I display the global temperature dependence of the time in a 1D Plot Global. I also Use the condition “Heat Flux” (qo = h (Text-T)) and also want to illustrate Text-T over the time.

An attempt was made to declare the global variable mod1.T under another name in
“Definition / Variable” to, but it does not work.

The error is as follows:
-Variable: mod1: T
-Global scope:

Variable: mode1.T_test
-Defined as: mod1.T

Failed to evaluate expression.
-Expression: mod1.T_test
-Plot: global1 (Global)

1 Reply Last Post Feb 6, 2013, 5:40 a.m. EST
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago Feb 6, 2013, 5:40 a.m. EST
Hi

What is a "global temperature ?

In COMSOL the temperature is a "field" its in fact T(x,y,z,t) but the COMSOL convention drops the "(x,y,z,t)"
This is often confusing. to make a variable global you need to integrate it over at least (x,y,z), or whatever applies depending on the dimensions you have used for your model

--
Good luck
Ivar
Hi What is a "global temperature ? In COMSOL the temperature is a "field" its in fact T(x,y,z,t) but the COMSOL convention drops the "(x,y,z,t)" This is often confusing. to make a variable global you need to integrate it over at least (x,y,z), or whatever applies depending on the dimensions you have used for your model -- Good luck Ivar

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.