Comsol tube modeling help

  • Thread starter alireza.b
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  • #1
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Main Question or Discussion Point

hello everyone
is anybody here using comsol multiphysics?
i'm trying to model a tube which the inlet is a fully developed fluid
but the problem is how to enter a parabolic inlet profile for velocity
in 2d axisymmetric it is very simple. but my model is 3d
i've entered "r" as a variable in definitions{r=sqrt((x^2)+(y^2))} and another variable for velocity, using "r". but the solution is not converged
how can i give the correct parabolic inlet?
 

Answers and Replies

  • #2
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I'm sorry you are not generating any responses at the moment. Is there any additional information you can share with us? Any new findings?
 
  • #3
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not yet
i fixed it by extrude the inlet plane to make sure that the inlet velocity profile is parabolic.
but no progress in giving parabolic profile to the software.
 

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