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Simple BC question

Posted 3 mag 2010, 05:56 GMT-4 0 Replies

Mark van Gerven
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Hello,

I want to simulate a laminar fluid flow through a straight pipe (vertical cylinder)
Instead of an inlet velocity (as a number) I want to set a laminar velocity profile as inlet BC.

I found a Comsol example in the model lib.
Comsol Multiphysics >> Fluid dynamics >> Micromixer...
The inlet BC (Navier Stokes) is:
U0 = (9/4)*U_mean*16*s1*(1-s1)*s2*(1-s2)
This results in a laminar velocity profile.

What should be my BC?

Copy and pasting the above results in a kind of sickle shaped velocity profile.

I hope someone can help me out.

Thanks,
Greetings.
0 Replies Last Post 3 mag 2010, 05:56 GMT-4
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