# Gauge or operating pressure ?

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 December 5, 2009, 11:36 Gauge or operating pressure ? #1 New Member   Guido Join Date: Dec 2009 Posts: 17 Rep Power: 9 Hi, i'm modeling a flow in a pipe and I've to set the initial velocity at the inlet. But what type of pressure ? 0 in operating pressure and 101325 Pa in gauge pressure or 0 in gauge e 101325 in operating ? Thanks

 December 5, 2009, 13:35 #2 Senior Member   karine Join Date: Nov 2009 Posts: 158 Rep Power: 10 Hi U mean what pressure at the outlet condition??? 101 325 at opertaing so 0 at gauge on the outlet.

 December 5, 2009, 13:41 #3 New Member   Guido Join Date: Dec 2009 Posts: 17 Rep Power: 9 I've read that Fluent use absolute pressure=operating pressure+gauge pressure. So i wanna know what pressure set and what put 0

 December 5, 2009, 13:44 #4 Senior Member   karine Join Date: Nov 2009 Posts: 158 Rep Power: 10 wanna put a pressure where?????????????????? on a pressure outlet????????????????? if u discharge at atmoshperic, put operating =101 325 and gauge = 0

 December 5, 2009, 13:48 #5 New Member   Guido Join Date: Dec 2009 Posts: 17 Rep Power: 9 No, in the operating conditions !

 December 5, 2009, 13:54 #6 Senior Member   karine Join Date: Nov 2009 Posts: 158 Rep Power: 10 in the operating conditions u just choose the operating pressure. Gauge pressure is chosen for a specified location

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