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Turbulence length for 3d flow

Posted 8 mars 2011, 02:24 UTC−5 Computational Fluid Dynamics (CFD) Version 4.1 1 Reply

mb
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Hi all,

what is an appropriate turbulence length for the inlet of a 3D channel. Can I use 0.07*channel_width as recommended in the doc for the 2D case?

Regards, Marcel
1 Reply Last Post 8 mars 2011, 22:21 UTC−5
Jim Freels mechanical side of nuclear engineering, multiphysics analysis, COMSOL specialist
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Posted: 1 decade ago 8 mars 2011, 22:21 UTC−5
That estimate is as good as any. It is not an exact science. You can prove this to yourself by using various values for the inlet turbulence, then realize that the difference is small downstream enough from the inlet.
That estimate is as good as any. It is not an exact science. You can prove this to yourself by using various values for the inlet turbulence, then realize that the difference is small downstream enough from the inlet.

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