# Reynolds Number- CFX Solver

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 December 15, 2009, 19:35 Reynolds Number- CFX Solver #1 New Member   Juan Lorenzo Join Date: Jul 2009 Posts: 19 Rep Power: 9 As the CFX calculates I number of Reynolds? formulates it uses it conventional? according to I have understood calculates the RE node-node but the values of a calculated value theoretically and the one that is observed in solver to manager are very different 1e5 theoretical ---- 7,3e5 CFX to solver? I must work with the theory or adjust to which leaves in solver?

 December 15, 2009, 23:30 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 12,638 Rep Power: 98 The Re number reported in the solver is based on a length scale defined as the cube root of the total solution volume, and averaged velocities and material properties. This is not a useful definition of Re for comparison to literature so you must define a Re based on the length, velocity and material properties you define.

 December 16, 2009, 10:07 #3 New Member   Juan Lorenzo Join Date: Jul 2009 Posts: 19 Rep Power: 9 thanks Glenn...

 December 19, 2009, 04:52 #4 New Member   JiangBiao Join Date: Nov 2009 Posts: 1 Rep Power: 0 it doesn't work

December 20, 2009, 17:28
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Rogerio Jack
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http://www.4shared.com/file/12861259...ldsNumber.html

Quote:
 Originally Posted by Jwolf As the CFX calculates I number of Reynolds? formulates it uses it conventional? according to I have understood calculates the RE node-node but the values of a calculated value theoretically and the one that is observed in solver to manager are very different 1e5 theoretical ---- 7,3e5 CFX to solver? I must work with the theory or adjust to which leaves in solver?

 January 23, 2010, 20:07 How to set the boundary of airfoil #6 New Member   Yibin Dou Join Date: Dec 2009 Posts: 13 Rep Power: 8 hi, everyone. I am not familiar with CFX and these days i try to learn how to use CFX to calc the airfoil, wing and other more complicated configures. I have got a RAE2822 airfoil grids by ICEM and my problem is how to set the proper boundaries in CFX. From the literatures I have read, there are two different kinds of boundaries setting. First, set the farfield as OPENING, setting static pressure and velocity. Another is set VELOCITY INLET and PRESSURE OUTLET. Set velocity in INLET and average pressure in OUTLET. I am confused about which one is proper. The tutorial says OPENING boundary only can be used in subsonic. So if i want to simulate a transonic case, do I have to choose VELOCITY INLET and PRESSURE OUTLET? Thanks a lot.

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