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Old   August 16, 2004, 17:32
Default two-point turbulence closures
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Can anyone explain what are two-point turbulence closures and their difference with one-point closures? Why they are called so? Their range of applications, complexities and benefits over one-point ones?

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Old   August 19, 2004, 06:50
Default Re: two-point turbulence closures
Jonas Bredberg
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Hi there,

Two-point correlation make use of correlation between the point in question and the influence from other points in the fluid. A teoretical book on turbulence modelling will give you more than sufficient information on this. I'm not familiar with anyone using two-point models. They are tremendously cpu-demanding as each point in the fluid need to be correlated with every else point (a so called N^2 problem), for each time (iteration) instance. Standard turbulence equation (k-eps, Reynolds stress etc.) are all one-point closures. The idea of using transport equations, which make them non-local due to the history effect, is however not related to the two-point closures.

Regards Jonas
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