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What does the abbreviation RNG in the RNG k-ε model stand for?

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What does the abbreviation RNG in the RNG k-ε model stand for?

(a) Random number generator

(b) Renormalization group

(c) Renormalization generator

(d) Random number group

I had been asked this question in an online quiz.

My question is taken from Turbulence Modelling topic in division Turbulence Modelling of Computational Fluid Dynamics

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Right option is (b) Renormalization group

To explain I would say: The RNG in the RNG k-ε model means renormalization group. This method was invented by Yakhot and Orszag of Princeton University. This is invented to overcome the disadvantages of the k-ε model.

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