Opening boundary condition

sicfred · May 10, 2012, 12:10

Hi all,

My question is quite simple:
Is there an "Opening" BC in Fluent like in CFX? Because, I usually use the "pressure_outlet" to achive this condition (gauge pressure=0), but I'm not really sure if it is a correct solution.

Regards

delaneyluke · May 11, 2012, 03:21

The Opening BC in CFX is also a pressure outlet BC. Only difference is that it allows a reversed flow and does not close off faces which encounter a reversed flow (like the pressure outlet BC does in CFX)

Regards
Luke

sicfred · May 11, 2012, 07:18

Thanks Luke,

And, do you know if it exist a big difference between use pressure inlet or pressure outlet in this case?, because i saw people in the forum using pressure inlet, and i think it is not a good solution.

delaneyluke · May 11, 2012, 07:46

In which case? What are you trying to analyse?
In most cases a pressure inlet with a pressure outlet is the most stable BC combo

Regards
Luke

May 10, 2012, 12:10	Opening boundary condition	#1
sicfred New Member Elias Paez Join Date: Nov 2011 Location: Madrid Posts: 25 Rep Power: 15	Hi all, My question is quite simple: Is there an "Opening" BC in Fluent like in CFX? Because, I usually use the "pressure_outlet" to achive this condition (gauge pressure=0), but I'm not really sure if it is a correct solution. Regards

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May 11, 2012, 03:21		#2
delaneyluke Senior Member Join Date: Mar 2009 Location: Indiana, US Posts: 186 Rep Power: 17	The Opening BC in CFX is also a pressure outlet BC. Only difference is that it allows a reversed flow and does not close off faces which encounter a reversed flow (like the pressure outlet BC does in CFX) Regards Luke

May 11, 2012, 07:18		#3
sicfred New Member Elias Paez Join Date: Nov 2011 Location: Madrid Posts: 25 Rep Power: 15	Thanks Luke, And, do you know if it exist a big difference between use pressure inlet or pressure outlet in this case?, because i saw people in the forum using pressure inlet, and i think it is not a good solution.

May 11, 2012, 07:46		#4
delaneyluke Senior Member Join Date: Mar 2009 Location: Indiana, US Posts: 186 Rep Power: 17	In which case? What are you trying to analyse? In most cases a pressure inlet with a pressure outlet is the most stable BC combo Regards Luke