Development of High Reynolds Number Optimal Les Models
The well-known goal of large-eddy simulation (LES) is to simulate high- Reynolds number turbulent flows, without resolving the dissipative scales. This requires a model for the unresolved scales, and the primary challenge of LES is the development of such models. A wide variety of LES models have been used in a range of flows, with varying success (Meneveau and Katz, 2000; Lesieur and Metáis, 1996). Recently, a new approach to the development of such models was proposed, called optimal LES. It is based on formal approximations to a well defined ideal LES evolution (Langford and Moser, 1999). The ideal LES has provably good properties, such as correct single-time statistics and minimum variance from the evolution of filtered turbulence, but unfortunately, the ideal LES model is impractical to determine.
KeywordsDirect Numerical Simulation High Reynolds Number Stochastic Estimation Isotropic Turbulence Dissipative Scale
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- Langford, J. A. and Moser, R. D. (2001). Breakdown of continuity in large-eddy simulation. Phys. of Fluids, 11:943–945.Google Scholar