Simple pressure difference question

atareen64 · February 1, 2011, 14:12

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! :-)

atareen64 · February 1, 2011, 17:16

Please any help would appreciated!
Thank you.

flowris · February 2, 2011, 05:39

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

February 1, 2011, 14:12	Simple pressure difference question	#1
atareen64 Member Ammar Tareen Join Date: Jan 2011 Location: Boston University Posts: 61 Rep Power: 15	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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February 1, 2011, 17:16		#2
atareen64 Member Ammar Tareen Join Date: Jan 2011 Location: Boston University Posts: 61 Rep Power: 15	Please any help would appreciated! Thank you.

February 2, 2011, 05:39		#3
flowris Senior Member Join Date: Apr 2010 Posts: 151 Rep Power: 16	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