Menu

Discussion Forum

New Discussion
查找

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 The information provided may be out of date.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.

time dependent problem with two physics

Posted 2011年8月18日 GMT+8 20:16 Version 4.1 5 Replies

Jawad Saleem
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

i am working on problem where i have apply two physics
1) electric current
and
2)solid mechanics
i want to apply the body load from time 0sec to 4sec
and want to apply current during time 2sec to 4sec

i tried to see the results but it only show the results during the time 2sec to 4sec
i want to see the results from 0 to 4sec

how can i do this should i use one time dependent study or i need two time dependent.
5 Replies Last Post 2011年8月20日 GMT+8 04:11
Kyle Shook
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 2011年8月19日 GMT+8 00:24
I think an easy way to do it might be this

since you are applying your load for the entire duration you dont need to change it
for applying current you can try
Current*(t>=2)
This will then only run the current for time t>=2
I think this will work
I think an easy way to do it might be this since you are applying your load for the entire duration you dont need to change it for applying current you can try Current*(t>=2) This will then only run the current for time t>=2 I think this will work
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 2011年8月19日 GMT+8 04:08
Hi

this might give you some convergence issues, to be tested,
if so, use rather the "pulse" function that has smoothed turn-on/off transitions

--
Good luck
Ivar
Hi this might give you some convergence issues, to be tested, if so, use rather the "pulse" function that has smoothed turn-on/off transitions -- Good luck Ivar
Jawad Saleem
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 2011年8月19日 GMT+8 17:51
it did not work out with this T>=2
it did not work out with this T>=2
Jawad Saleem
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 2011年8月19日 GMT+8 17:55
i am new in using the time dependent model. dont know exactly how to use the pulse source. for two or three physics model do we need separate time dependent studies.

i tried to see example on the website most examples are stationary study
please guide me to find good examples for time dependent problems
i am new in using the time dependent model. dont know exactly how to use the pulse source. for two or three physics model do we need separate time dependent studies. i tried to see example on the website most examples are stationary study please guide me to find good examples for time dependent problems
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 2011年8月20日 GMT+8 04:11
Hi

you can solve all either in one go, or in a segregated way variable by variable, or iteratively, all depends on how the variables are inter-dependent, and how much RAM you need and you have available.
There is no "one" way. But mostly COMSOL proposes a default way quite OK

--
Good luck
Ivar
Hi you can solve all either in one go, or in a segregated way variable by variable, or iteratively, all depends on how the variables are inter-dependent, and how much RAM you need and you have available. There is no "one" way. But mostly COMSOL proposes a default way quite OK -- 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.

Suggested Content