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Old   September 1, 2005, 10:24
Default CUSTOM BOUNDARY CONDITION
  #1
stk
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DOES ANYBODY KNOWS IF FLUENT SUPPORTS CUSTOM BOUNDARY CONDITION? BY CUSTOM I DON'T MEAN PROFILE B.C.'S BUT NEW TYPE. FOR EXAMPLE U''(X)=0 AT OUTLET???

THANK YOU
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Old   September 1, 2005, 16:26
Default Re: CUSTOM BOUNDARY CONDITION
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Ramsey
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I am also wondering the same thing. Would it be possible to change the outlet from a Pressure Outlet to a wall depending on the time?
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Old   September 2, 2005, 03:11
Default Re: CUSTOM BOUNDARY CONDITION
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Luca
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I have your same problem, but I fear the answer is no...Please let me know if you find an anwer to our probs. Luca
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Old   September 2, 2005, 06:21
Default Re: CUSTOM BOUNDARY CONDITION
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razvan
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That's perfectly possible! If you can do it using "boundary conditions" panel, then you can also do it using macros and "execute commands" panel. There you are able to execute it at any number of time-steps you need (of course you are restricted to equal number of time-steps).

This might be enough for you. Another way I do not know for now.

Best wishes, Razvan
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Old   September 11, 2005, 21:41
Default Re: CUSTOM BOUNDARY CONDITION
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Hadley
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I also have a similar problem! I want to define a constant volumetric flow rate boundary condition for an unsteady gas flow problem (like what you'd have if a vacuum pump was evacuating a chamber). Can I do that??!!
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Old   September 12, 2005, 02:46
Default Re: CUSTOM BOUNDARY CONDITION
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Luca
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Dear Hadley, this can be done quite simply. You should define a mass source. See Fluent documentation. Regards Luca
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Old   September 12, 2005, 17:24
Default Re: CUSTOM BOUNDARY CONDITION
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Hadley
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Thanks Luca. I'll try that and see how it goes.
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Old   September 21, 2009, 13:02
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  #8
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pinho
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jpinho is on a distinguished road
Dear Luca...
You said it was quite simple.. but I am not getting the ideia..
How can you simulate a simple case where you want evacuate air from a chamber.. and plotting the pressure over time??
regards
jpinho
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