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When to use Pressure outlet bc?

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Old   July 6, 2017, 12:51
Default When to use Pressure outlet bc?
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ali
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Hi All,

I just read in a tutorial online that "pressure outlet" boundary condition must only be used if the inlet BC is "pressure inlet".

Is that true? and why?

Thanks,
Ali
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Old   July 6, 2017, 15:19
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No it is not true. In many cases the outlet pressure is the only hard boundary condition that you even have. Maybe you misinterpreted something else. For example, maybe you were reading a pressure outlet with targeted mass-flow rate.
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Old   July 7, 2017, 18:03
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Thank you so much.
I read it in the slide#13 of this power point.

https://lyle.smu.edu/me/7337/fluent_bcs.pdf

Do you think it is wrong?

Last edited by alinik; July 7, 2017 at 18:07. Reason: attachement
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Old   July 8, 2017, 07:17
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That's is easy to answer, if you specify both pressure then the system is over specified. It will diverge. The only way that may work is incompressible flows. However, my experience shows that pressure is always the hardest to get working properly
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