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If condition in coupled PDEs

Posted 06.06.2012, 17:38 GMT-4 Version 4.2 2 Replies

Mahmood Mamivand
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I am solving 9 coupled-Nonlinear PDEs. How can I add an "If condition" to dependent variables? (e.g constrained their value to change in a specific domain, 0 and 1)
(if x>1 then x=1 and if x<0 then x=0)
2 Replies Last Post 12.06.2012, 10:43 GMT-4
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 07.06.2012, 02:04 GMT-4
Hi

check the doc on the if() operator, or use Bolean expressions

--
Good luck
Ivar
Hi check the doc on the if() operator, or use Bolean expressions -- Good luck Ivar
Mahmood Mamivand
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Posted: 1 decade ago 12.06.2012, 10:43 GMT-4
Thank you,
but I do not know where to put these IFs. I have 9 PDEs(g) and each of them has its own Gama and f. I add some if at the end of f part (force part) but it says Syntax error.
Should I add these IFs in Constraints part?
Thank you, but I do not know where to put these IFs. I have 9 PDEs(g) and each of them has its own Gama and f. I add some if at the end of f part (force part) but it says Syntax error. Should I add these IFs in Constraints part?

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