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 The information provided may be out of date.

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Current Time Step Variable

Posted 2011年4月21日 GMT-4 12:51 Version 4.1 6 Replies

Franz Bozsak
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Dear COMSOL users,

does anyone know the name of the variable where COMSOL saves the current time step, so it could be used in an expression? (If that was possible at all)

I looked through the manual and could not find anything.

Thanks for your help,
Franz
6 Replies Last Post 2011年4月21日 GMT-4 18:30
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 2011年4月21日 GMT-4 13:04
Hi

during solver process it "t" for the time value, if you need to select a solution at a given time you have the "at()" operators, see the doc

--
Good luck
Ivar
Hi during solver process it "t" for the time value, if you need to select a solution at a given time you have the "at()" operators, see the doc -- Good luck Ivar
Franz Bozsak
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Posted: 1 decade ago 2011年4月21日 GMT-4 13:07
Hi Ivar,

thanks for your quick reply. Unfortunately, this is not what I meant: I need the actual current time step (so delta t) used in the solver.

Franz
Hi Ivar, thanks for your quick reply. Unfortunately, this is not what I meant: I need the actual current time step (so delta t) used in the solver. Franz
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 2011年4月21日 GMT-4 13:33
Hi

missed that ;)
There are a few threads about this, and something has been added in the last released, check the release notes, but I haven't used it, so I cannot remember like that. (be sure you patch to latest update)

--
Good luck
Ivar
Hi missed that ;) There are a few threads about this, and something has been added in the last released, check the release notes, but I haven't used it, so I cannot remember like that. (be sure you patch to latest update) -- Good luck Ivar
Jeff Hiller COMSOL Employee

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Posted: 1 decade ago 2011年4月21日 GMT-4 13:42
Hello Franz,
Perhaps we can go at this from a different angle. Why do you think you need to know what the time step is called? What are you planning to do with it?

I am asking this because I suspect that you may be trying to reimplement something that's already available in the software (like time derivatives for instance).
Hello Franz, Perhaps we can go at this from a different angle. Why do you think you need to know what the time step is called? What are you planning to do with it? I am asking this because I suspect that you may be trying to reimplement something that's already available in the software (like time derivatives for instance).
Jeff Hiller COMSOL Employee

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Posted: 1 decade ago 2011年4月21日 GMT-4 13:55
In case you REALLY need the time step, see User's Guide, version 4.1, page 85.
In case you REALLY need the time step, see User's Guide, version 4.1, page 85.
Franz Bozsak
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Posted: 1 decade ago 2011年4月21日 GMT-4 18:30
Thanks a lot for your responses! I will check that tomorrow morning.
Unfortunately, I would like to do something that is currently not yet available in COMSOL: Stabilization schemes in the PDE interface!
Thanks a lot for your responses! I will check that tomorrow morning. Unfortunately, I would like to do something that is currently not yet available in COMSOL: Stabilization schemes in the PDE interface!

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