Setting Both Pressure and Flow at Inlet

ashtonJ · March 8, 2012, 18:19

Dear All,

Does anybody know how to set both flow and pressure as inlet boundary condition.

Kind regards,
AshtonJ

evcelica · March 8, 2012, 21:59

Sounds like you would be over-constraining the problem, why would you want to do this?

If you have one inlet and one outlet you could set the pressure at your inlet, and set the mass flow at your outlet; due to conservation of mass you would then have the same flow at your inlet. Therefore you would have set the mass flow and pressure at your inlet.

ghorrocks · March 9, 2012, 04:13

It is impossible. It is over constraining the boundary and cannot be done. But for a steady state flow the flow in equals the flow out, so you might be able to put a pressure boundary at the inlet and a flow boundary at the outlet.

March 8, 2012, 18:19	Setting Both Pressure and Flow at Inlet	#1
ashtonJ Senior Member Ashkan Javadzadegan Join Date: Sep 2010 Posts: 255 Rep Power: 16	Dear All, Does anybody know how to set both flow and pressure as inlet boundary condition. Kind regards, AshtonJ

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March 8, 2012, 21:59		#2
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,167 Rep Power: 23	Sounds like you would be over-constraining the problem, why would you want to do this? If you have one inlet and one outlet you could set the pressure at your inlet, and set the mass flow at your outlet; due to conservation of mass you would then have the same flow at your inlet. Therefore you would have set the mass flow and pressure at your inlet.

March 9, 2012, 04:13		#3
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,700 Rep Power: 143	It is impossible. It is over constraining the boundary and cannot be done. But for a steady state flow the flow in equals the flow out, so you might be able to put a pressure boundary at the inlet and a flow boundary at the outlet.