# Average Velocity

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 May 31, 2013, 16:47 Average Velocity #1 New Member   Michal Join Date: Sep 2012 Posts: 12 Rep Power: 7 Hello, I simulate a velocity distribution in an exhaust channel. After solve I check a velocity distribution (as contour) in an selected area. Is there a posibility to show one average value of velocity in this selected area? (for exampe Area1, d=200mm, v=+1,2 m/s) Michal

 June 1, 2013, 06:13 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 14,070 Rep Power: 109 Yes, I think you can put CEL expressions in a text object.

 June 1, 2013, 07:22 #3 Member   rasool Join Date: Apr 2013 Posts: 41 Rep Power: 6 ave(velocity)@area

 June 1, 2013, 08:37 #4 New Member   Michal Join Date: Sep 2012 Posts: 12 Rep Power: 7 Hello, thank you for advices: In CFD-post I wrote an expression: ave(Velocity)@Area but I have an error: "The following unrecognised name was referenced: Area." Velocity and Area are under default variables in CFX.

 June 1, 2013, 10:04 #5 Senior Member   Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 707 Rep Power: 13 Rasool just wrote the word area to be general. Really put the name of that specific surface there. ave(Velocity)@B1.122 or Outlet or something like that.

 June 2, 2013, 09:58 #6 Member   Join Date: Nov 2011 Location: Czech Republic Posts: 95 Rep Power: 8 The easiest way to do that is by using "Function Calculator" in CFD-Post (tab Calculators). If you want to monitor this quantity during a CFD simulation, you will have to define the suggested CEL in CFX-Pre under "Output Control" (tab Monitor).

June 3, 2013, 01:51
#7
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Lance
Join Date: Mar 2009
Posts: 619
Rep Power: 15
Quote:
 Originally Posted by Szczepan In CFD-post I wrote an expression: ave(Velocity)@Area but I have an error:
use areaAve()@ instead, ave()@ will most likely not give you the true average velocity over the surface

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