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2D to 3D turbulence

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Old   February 26, 2013, 18:33
Default 2D to 3D turbulence
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I want to perform a cheap DNS for a rectangular jet surrounded by coflow.
The geometric configuration is-
inhomogeneous normal in y-dir
inhomogeneous streamwise in z-dir
homogeneous spanwise x-dir is periodic

The question is what should be the domain extent in x direction
so that I get a 3D turbulence and not a 2D one.
Can you suggest (or refer) domain extent in terms of geometry(slot width) or integral scale?

Thanks apriori
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