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time dependent problem with two physics

Posted Aug 18, 2011, 8:16 a.m. EDT Version 4.1 5 Replies

Jawad Saleem
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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 Aug 19, 2011, 4:11 p.m. EDT
Kyle Shook
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Posted: 1 decade ago Aug 18, 2011, 12:24 p.m. EDT
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)
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Posted: 1 decade ago Aug 18, 2011, 4:08 p.m. EDT
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
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Posted: 1 decade ago Aug 19, 2011, 5:51 a.m. EDT
it did not work out with this T>=2
it did not work out with this T>=2
Jawad Saleem
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Posted: 1 decade ago Aug 19, 2011, 5:55 a.m. EDT
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)
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Posted: 1 decade ago Aug 19, 2011, 4:11 p.m. EDT
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

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