# To output the RANS local mean velocity(Reynolds averaged)

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 February 2, 2013, 14:28 To output the RANS local mean velocity(Reynolds averaged) #1 Senior Member     Meimei Wang Join Date: Jul 2012 Posts: 494 Rep Power: 9 Sponsored Links Hi, I'd like to use the local mean velocity to compute the turbulence intensity of one surface. May I ask could CFX-post output local mean velocity(Reynolds averaged) directly? __________________ Best regards, Meimei

 February 3, 2013, 06:05 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 13,651 Rep Power: 105 If you are using a RANS turbulence model with an incompressible fluid then the velocities reported are Reynolds averaged velocities. If you are doing a LES or DNS model then you have to be a bit more sophistocated, but I won't go into that unless you actually are doing LES or DNS. If you are doing a RANS turbulence model with a compressible fluid then the velocities are Fauve averaged.

 February 9, 2013, 20:01 #3 Senior Member   Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 654 Rep Power: 13 Turbulence Intensity at a surface? Velocity at your surface will be 0, and near the wall the flow will be laminar.

 February 10, 2013, 05:30 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 13,651 Rep Power: 105 I presume the surface she is talking about is defined in CFD-Post across the flow. Because, yes, the turbulence on a wall is zero.

February 10, 2013, 14:54
#5
Senior Member

Meimei Wang
Join Date: Jul 2012
Posts: 494
Rep Power: 9
Quote:
 Originally Posted by evcelica Turbulence Intensity at a surface? Velocity at your surface will be 0, and near the wall the flow will be laminar.
Sorry. The 'surface' I mentioned is defined in CFX-post. It's not the wall.
__________________
Best regards,
Meimei

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