# the boundary condition problem

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 December 25, 2014, 04:17 the boundary condition problem #1 New Member   Hao Join Date: Dec 2014 Location: Beijing, China Posts: 6 Rep Power: 4 Hello everyone，I have a model. The inlet boundary is pressure which is changing. Now I want to know the outlet pressure by simulation of CFX. The outlet condition is connected to a throttle valve. So, how I should set the outlet boundary condition? Thank you for helping me to solve this problem.

 December 25, 2014, 04:21 #2 New Member   Hao Join Date: Dec 2014 Location: Beijing, China Posts: 6 Rep Power: 4 Tt is a transient problem.

 December 25, 2014, 04:41 #3 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 13,639 Rep Power: 105 If you want the outlet pressure then you must know the flow rate. So use a massflow outlet.

 December 30, 2014, 06:33 #4 Senior Member     Marcin Join Date: May 2014 Location: Poland, Swiebodzin Posts: 139 Rep Power: 5 on the first step (in my opinion) you can make static pressure 0 Pa on the outlet and define a plane before outlet to determine pressure

 December 30, 2014, 22:01 #5 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 13,639 Rep Power: 105 But the outlet pressure is 0 because that is what you defined it to be. So why do you need another plane to give you an outlet pressure value?

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