Average Velocity

Szczepan · May 31, 2013, 17:47

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

ghorrocks · June 1, 2013, 07:13

Yes, I think you can put CEL expressions in a text object.

rasool motamedi · June 1, 2013, 08:22

ave(velocity)@area

Szczepan · June 1, 2013, 09:37

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.

evcelica · June 1, 2013, 11:04

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.

Sixkillers · June 2, 2013, 10:58

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).

Lance · June 3, 2013, 02:51

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

May 31, 2013, 17:47	Average Velocity	#1
Szczepan New Member Michal Join Date: Sep 2012 Posts: 12 Rep Power: 14	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

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June 1, 2013, 07:13		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,872 Rep Power: 144	Yes, I think you can put CEL expressions in a text object.

June 1, 2013, 08:22		#3
rasool motamedi Member rasool Join Date: Apr 2013 Posts: 41 Rep Power: 13	ave(velocity)@area

June 1, 2013, 09:37		#4
Szczepan New Member Michal Join Date: Sep 2012 Posts: 12 Rep Power: 14	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, 11:04		#5
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,188 Rep Power: 23	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, 10:58		#6
Sixkillers Member Join Date: Nov 2011 Location: Czech Republic Posts: 97 Rep Power: 15	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).