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Old   February 1, 2011, 14:12
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Ammar Tareen
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Hello everybody,

Kindly help me with a simple question: I have a rectangular tube, with one inlet and one outlet. I want to flow air through that tube. For my BC, I want higher pressure on the inlet and lower pressure on the outlet so that air will flow.

My question is, will I need to specify the value of pressure at the internal field? or is specifying the boundary conditions at the inlet and outlet sufficient? please let me know!

THAAANKS! :-)
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Old   February 1, 2011, 17:16
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Please any help would appreciated!
Thank you.
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Old   February 2, 2011, 05:39
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Hello,

For flows in a channel with inlet and outlet, the following BCs (0 folder) are often used:
- inlet: U fixedValue U_0, p zero gradient
- outlet: U zero gradient, p fixed value p_0
- internal field: U uniform U_0, p uniform p_0
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