A study of anomalous scaling in models of passive scalar advection in terms of singular coherent structures is proposed. The stochastic dynamical system considered is a shell model reformulation of Kraichnan model. We extend the method introduced by Daumont, Dombre, and Gilson (e-print archive chao-dyn/9905017) to the calculation of self-similar instantons and we show how such objects, being the most singular events, are appropriate to capture asymptotic scaling properties of the scalar field. Preliminary results concerning the statistical weight of fluctuations around these optimal configurations are also presented. [S1063-651X(99)51312-3].

Biferale L., D.I. (1999). Coherent structures in random shell models for passive scalar advection. PHYSICAL REVIEW E, 60(6), R6299-R6302.

Coherent structures in random shell models for passive scalar advection

BIFERALE, LUCA;
1999

Abstract

A study of anomalous scaling in models of passive scalar advection in terms of singular coherent structures is proposed. The stochastic dynamical system considered is a shell model reformulation of Kraichnan model. We extend the method introduced by Daumont, Dombre, and Gilson (e-print archive chao-dyn/9905017) to the calculation of self-similar instantons and we show how such objects, being the most singular events, are appropriate to capture asymptotic scaling properties of the scalar field. Preliminary results concerning the statistical weight of fluctuations around these optimal configurations are also presented. [S1063-651X(99)51312-3].
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici
eng
Con Impact Factor ISI
INTERMITTENCY
Biferale L., D.I. (1999). Coherent structures in random shell models for passive scalar advection. PHYSICAL REVIEW E, 60(6), R6299-R6302.
Biferale, L; Daumont, I; Dombre, T; Lanotte, A
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/57922
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