Large-eddy-simulation closures of passive scalar turbulence: a systematic approach

• Tipo: Artigo em Revista Científica Internacional
• Data: 2003

Autores

Afonso, MM (Autor) Outra; Celani, A (Autor) Outra; Festa, R (Autor) Outra; Mazzino, A (Autor) Outra

Revista

Título: Journal of Fluid Mechanics

Vol. 496

Páginas: 355-364

ISSN: 0022-1120

Editora: Cambridge University Press

Indexação

ISI Web of Knowledge - 8 Citações

Scopus - 8 Citações

Outras Informações

ID Authenticus: P-00N-NKX

DOI: 10.1017/s0022112003006505

Abstract (EN): The issue of the parameterization of small-scale ('subgrid') turbulence is addressed in the context of passive scalar transport. We focus on the Kraichnan advection model which lends itself to the analytical investigation of the closure problem. We derive systematically the dynamical equations which rule the evolution of the coarse-grained scalar field. At the lowest-order approximation in l/r, l being the characteristic scale of the filter defining the coarse-grained scalar field and r the inertial-range separation, we recover the classical eddy-diffusivity parameterization of small scales. At the next-leading order a dynamical closure is obtained. This outperforms the classical model and is therefore a natural candidate for subgrid modelling of scalar transport in generic turbulent flows.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10