Simple pressure difference question
 

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! :-)

Please any help would appreciated!
Thank you.

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