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TWO-POINT CLOSURES AND TURBULENCE MODELING

Jean Pierre Bertoglio
Laboratoire de Mecanique des Fluides et d'Acoustique UMR 5509 Ecole Centrale de Lyon 36 Av. Guy de Collongue, 69130 Ecully, FRANCE

Resumo

The main ideas underlying the derivation of the usual two-point closures are reviewed. The Direct Interaction Approximation (DIA) and related closures, and the Eddy-Damped Quasi Normal Markovian (EDQNM) model are briefly presented. Particular emphasis is given to the application of closures to homogeneous anisotropic turbulence. The relations between two-point closures and other types of turbulence models, in particular subgrid models for Large-Eddy Simulations, are briefly presented. Finally, the possible extensions of two-point models to inhomogeneous turbulence are discussed and some representative results are given.