How can I enter a parabolic inlet profile in Comsol for 3D tube modeling?

AI Thread Summary
To model a parabolic inlet profile for a 3D tube in COMSOL Multiphysics, the user initially struggled with defining the velocity profile, as the process was straightforward in 2D axisymmetric models. They defined a variable "r" for the radial coordinate but faced convergence issues with their solution. The user ultimately resolved the problem by extruding the inlet plane, ensuring the inlet velocity profile was parabolic. However, they still sought a more effective method to input the parabolic profile directly into the software. The discussion highlights the challenges of transitioning from 2D to 3D modeling in fluid dynamics simulations.
alireza.b
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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?
 
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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?
 
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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