# Renormalization Group Method in Turbulence Model

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 December 16, 1999, 04:42 Renormalization Group Method in Turbulence Model #1 wood Guest   Posts: n/a 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! wood

 December 16, 1999, 05:08 Re: Renormalization Group Method in Turbulence Model #2 Jonas Larsson Guest   Posts: n/a 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.

 January 10, 2000, 20:15 Re: Renormalization Group Method in Turbulence Model #3 clifford bradford Guest   Posts: n/a 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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