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Renormalization Group Method in Turbulence Model

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Old   December 16, 1999, 04:42
Default Renormalization Group Method in Turbulence Model
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Hi, Can any one explain the Renormaliztion Group Method in a simpler way than a pure mathimatics? Is it the link between the molecular space and the macro space? What is the difference between the RNG and LES?

Thanks in advance!

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Old   December 16, 1999, 05:08
Default Re: Renormalization Group Method in Turbulence Model
Jonas Larsson
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RNG is a mathematical tool to derive turbulence models. LES is one type of simulation where the larger turbulent scales are resolved (ie 3D unsteady) and the smaller scales are modeled with a sub-grid model. There are LES simulations where people use RNG based sub-grid models. There are also RNG models, for example RNG k-epsilon models, where the RNG model is used for all turbulent scales.

The foundations of RNG are not easy to understand - very mathematical stuff. The big "success" of RNG was when it was shown to reproduce almost exactly the k-epsilon form of equations.

One nice book that contains a few chapters on RNG etc. is McComb, "The Physics of Fluid Turbulence". Also look for papers by Yakhot and Orzag.
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Old   January 10, 2000, 20:15
Default Re: Renormalization Group Method in Turbulence Model
clifford bradford
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to understand group theory you'd have to take a very boring and uninteresting graduate math class in abstract algebra. trust me you don't want to do this
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