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Artículo

Decay of Batchelor and Saffman rotating turbulence

Teitelbaum, TomasIcon ; Mininni, Pablo DanielIcon
Fecha de publicación: 12/2012
Editorial: American Physical Society
Revista: Physical Review E: Statistical, Nonlinear and Soft Matter Physics
ISSN: 1539-3755
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Astronomía

Resumen

The decay rate of isotropic and homogeneous turbulence is known to be affected by the large-scale spectrum of the initial perturbations, associated with at least two canonical self-preserving solutions of the von Kármán-Howarth equation: the so-called Batchelor and Saffman spectra. The effect of long-range correlations in the decay of anisotropic flows is less clear, and recently it has been proposed that the decay rate of rotating turbulence may be independent of the large-scale spectrum of the initial perturbations. We analyze numerical simulations of freely decaying rotating turbulence with initial energy spectra ∼k4 (Batchelor turbulence) and ∼k2 (Saffman turbulence) and show that, while a self-similar decay can not be identified for the total energy, the decay is indeed affected by long-range correlations. The decay of two- and three-dimensional modes follows distinct power laws in each case, which are consistent with predictions derived from the anisotropic von Kármán-Howarth equation, and with conservation of anisotropic integral quantities by the flow evolution. © 2012 American Physical Society.
Palabras clave: Rotating Flows , Batchelor Spectrum , Energy Decay
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/55965
URL: http://pre.aps.org/abstract/PRE/v86/i6/e066320
DOI: http://dx.doi.org/10.1103/PhysRevE.86.066320
Colecciones
Articulos(IFIBA)
Articulos de INST.DE FISICA DE BUENOS AIRES
Citación
Teitelbaum, Tomas; Mininni, Pablo Daniel; Decay of Batchelor and Saffman rotating turbulence; American Physical Society; Physical Review E: Statistical, Nonlinear and Soft Matter Physics; 86; 6; 12-2012; 6632001-6632013
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