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July 6, 2017, 13:51 |
When to use Pressure outlet bc?
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#1 |
Senior Member
ali
Join Date: Oct 2009
Posts: 318
Rep Power: 18 |
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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July 6, 2017, 16:19 |
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#2 |
Senior Member
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,750
Rep Power: 66 |
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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July 7, 2017, 19:03 |
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#3 |
Senior Member
ali
Join Date: Oct 2009
Posts: 318
Rep Power: 18 |
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 19:07. Reason: attachement |
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July 8, 2017, 08:17 |
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#4 |
Senior Member
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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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pressure inlet, pressure outlet |
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