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.
If statement in material properties
Posted 30 août 2015, 03:49 UTC−4 Materials Version 5.0 2 Replies
Please login with a confirmed email address before reporting spam
Hi, I am a complete beginner in COMSOL and I am wondering how to include an if statement in material properties. For example, I want the density,p to be dependent on temperature, T such that if T<273K, p=998 and if T>273K, p=1000. Thanks :)
2 Replies Last Post 30 août 2015, 05:06 UTC−4
Please login with a confirmed email address before reporting spam
Posted:
9 years ago
Hi
there are a simpler way for 2 levels:
998+2*(T[1/K]>273)
But as COMSOL solvers (as we were thought once in our math courses ;) prefer continuous functions you should rather use one of the built in Step functions with smoothing for the transition region, or the piecewise interpolation functions. Check the sub nodes under "Definitions", and check out the Videos on functions and operators
--
Good luck
Ivar
there are a simpler way for 2 levels:
998+2*(T[1/K]>273)
But as COMSOL solvers (as we were thought once in our math courses ;) prefer continuous functions you should rather use one of the built in Step functions with smoothing for the transition region, or the piecewise interpolation functions. Check the sub nodes under "Definitions", and check out the Videos on functions and operators
--
Good luck
Ivar
Please login with a confirmed email address before reporting spam
Posted:
9 years ago
Alright Thanks for the information :)