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

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SUMMARY

The discussion focuses on modeling a parabolic inlet profile for a 3D tube in COMSOL Multiphysics. The user initially struggled with defining the inlet velocity profile using the variable "r" and encountered convergence issues. The solution was found by extruding the inlet plane to ensure the velocity profile was parabolic, although challenges in directly inputting the parabolic profile into the software remained unresolved.

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  • Familiarity with COMSOL Multiphysics software
  • Understanding of fluid dynamics principles, specifically parabolic velocity profiles
  • Knowledge of 3D modeling techniques in computational fluid dynamics
  • Experience with variable definitions and mathematical expressions in simulation software
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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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