A two-equation turbulence model that can adjust itself from RANS to LES regimes is constructed using the renormalization group. When the grid-spacing gets to coarse for LES, the model tends to a RANS model. In well-resolved regions the model results in a LES subgrid-model. The renormalization group procedure leads to transport-equations that are dependent on the filterwidth and contain no adjustable constants.
Hybrid RANS-LES Modelling With the Renormalization Group
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De Langhe, C, Merci, B, & Dick, E. "Hybrid RANS-LES Modelling With the Renormalization Group." Proceedings of the ASME 2002 Joint U.S.-European Fluids Engineering Division Conference. Volume 1: Fora, Parts A and B. Montreal, Quebec, Canada. July 14–18, 2002. pp. 647-651. ASME. https://doi.org/10.1115/FEDSM2002-31280
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