# How to set up a CFX Pre?

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 July 1, 2009, 22:28 How to set up a CFX Pre? #1 New Member   anonymous Join Date: Jul 2009 Posts: 4 Rep Power: 9 hi All, I am int interested to see flow behavior on wings and wing with winglet. I have the following test conditions : Stagnation temperature =322 K dynamic pressure : 41KN/M^2 Mach = 0.8 Re =17 million per unit length. with these test conditions ,how to apply BC in CFX Pre?

 July 2, 2009, 02:19 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 13,539 Rep Power: 104 Hi, Look up the definition of all these terms. Then solve a simultaneous set of equations to determine what they mean in terms of pressure, velocity, density etc. Then you apply the boundary in CFX-Pre, probably in terms of velocity and temperature inlet and pressure outlet. Glenn Horrocks

 July 2, 2009, 04:04 #3 New Member   anonymous Join Date: Jul 2009 Posts: 4 Rep Power: 9 Hi ghorrocks, Thanks for your reply. I able to caalculate velocity and temperature from the availble data. I am not sure on exit boundary condition,because the data does not provide any thing on outlet. can I use relative static pressure as zero at outlet?

 July 2, 2009, 06:53 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 13,539 Rep Power: 104 Hi, The exit pressure will be whatever the ambient pressure is. Unless you know otherwise then I would guess 1 atm absolute. You would then use 1 atm as your reference pressure and set the exit pressure to 0 gauge pressure. Glenn Horrocks

July 2, 2009, 12:46
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anonymous
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 Originally Posted by ghorrocks Hi, The exit pressure will be whatever the ambient pressure is. Unless you know otherwise then I would guess 1 atm absolute. You would then use 1 atm as your reference pressure and set the exit pressure to 0 gauge pressure. Glenn Horrocks
Thanks. I set up CFX run today .Let me see how it will run.

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