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-   -   To output the RANS local mean velocity(Reynolds averaged) (http://www.cfd-online.com/Forums/cfx/112684-output-rans-local-mean-velocity-reynolds-averaged.html)

Anna Tian February 2, 2013 14:28

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

ghorrocks February 3, 2013 06:05

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.

evcelica February 9, 2013 20:01

Turbulence Intensity at a surface? Velocity at your surface will be 0, and near the wall the flow will be laminar.

ghorrocks February 10, 2013 05:30

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.

Anna Tian February 10, 2013 14:54

Quote:

Originally Posted by evcelica (Post 406926)
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.


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