Vacuum Pressure at Outflow -- CFD Online Discussion Forums

March 6, 2012, 07:32	Vacuum Pressure at Outflow	#1
Leepox Member Join Date: Nov 2011 Posts: 42 Rep Power: 14	Hi guys, Basically I am injecting air in at atmospheric pressure from one end. Whilst at the other end there is a vacuum pump sucking out the air. I take it I will have to use a pressure outlet BC. However its asking for a gauge pressure and this is boggling me because absolute = atmospheric + gauge. (thus my operating pressure is at 0 for gauge pressure) Since i am operating below atmospheric that means gauge has to be negative but then hysys does not allow me to do that. Or am I completely missing the point?

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