boundary with pressure jump

ndgoncalves · April 12, 2017, 12:29

I need to impose a pressure jump in a boundary, i. e. a pressure drop as function of flow rate in a extrude that I don't want to do geometry/mesh. I can impose that in internal faces with porous jump. Does someone knows how to do it in a boundary?

LuckyTran · April 12, 2017, 15:07

Try the outlet-vent boundary condition.

ndgoncalves · April 13, 2017, 07:00

Thank you. It seems to be the BC I need. I need to impose a pressure drop as function of velocity, but I just found how to set the "loss coefficient" polynomial, i. e., dp=(k1+k2*v+...) rho/2 u^2, so it doesn't have just the "linear" dependency of u. There is some solution to that?

April 12, 2017, 12:29	boundary with pressure jump	#1
ndgoncalves New Member Nelson Gonçalves Join Date: Jun 2016 Location: Porto, Portugal Posts: 2 Rep Power: 0	I need to impose a pressure jump in a boundary, i. e. a pressure drop as function of flow rate in a extrude that I don't want to do geometry/mesh. I can impose that in internal faces with porous jump. Does someone knows how to do it in a boundary?

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April 12, 2017, 15:07		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,676 Rep Power: 66	Try the outlet-vent boundary condition.

April 13, 2017, 07:00		#3
ndgoncalves New Member Nelson Gonçalves Join Date: Jun 2016 Location: Porto, Portugal Posts: 2 Rep Power: 0	Thank you. It seems to be the BC I need. I need to impose a pressure drop as function of velocity, but I just found how to set the "loss coefficient" polynomial, i. e., dp=(k1+k2*v+...) rho/2 u^2, so it doesn't have just the "linear" dependency of u. There is some solution to that?