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Use previous time step solution in a function

Posted 17 sept. 2010, 09:30 UTC+2 2 Replies

Sébastien Janas
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Hi all,

I want to build an external function solving some stuff by finite differences. I need to give the solution of the previous time step to my function. Do you know how to get these solution in COMSOL ? Is there something like Ut or Ux for the time or space derivative of U ?

I will also need the value of the time step.

I know I can do this using Matlab scripting, but the Matlab API is very very slow, so useless for optimization purpose.

Thanks a lot for your help !

Sébastien
2 Replies Last Post 3 déc. 2010, 07:35 UTC+1
COMSOL Moderator

Hello Sébastien Janas

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Ivan Gruber
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Posted: 1 decade ago 2 déc. 2010, 21:22 UTC+1
Hi,

I am wondering if you were able to solve the problem?

Ivan
Hi, I am wondering if you were able to solve the problem? Ivan
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 3 déc. 2010, 07:35 UTC+1
Hi

check the 4.1 doc on the operator at(), with(), prev() and d(,)

there are a few threads on the Forum on different simple tricks how to get time derivatives for PDEs too

--
Good luck
Ivar
Hi check the 4.1 doc on the operator at(), with(), prev() and d(,) there are a few threads on the Forum on different simple tricks how to get time derivatives for PDEs too -- Good luck Ivar

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