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Comsol tube modeling help

  1. Jul 13, 2014 #1
    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?
  2. jcsd
  3. Aug 3, 2014 #2
    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?
  4. Aug 8, 2014 #3
    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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