Coarse-grained description of a passive scalar

• Type: Article in International Scientific Journal
• Date: 2006

Authors

Celani, A (Author) Other; Afonso, MM (Author) Other; Mazzino, A (Author) Other

Journal

Title: Journal of Turbulence

Vol. 7 No. 63

Pages: 1-18

ISSN: 1468-5248

Publisher: Taylor & Francis

Indexing

ISI Web of Knowledge - 3 Citations

Scopus - 4 Citations

Other information

Authenticus ID: P-00N-NM4

DOI: 10.1080/14685240600779388

Abstract (EN): The issue of the parameterization of small-scale dynamics is addressed in the context of passive-scalar turbulence. The basic idea of our strategy is to identify dynamical equations for the coarse-grained scalar dynamics starting from closed equations for two-point statistical indicators. With the aim of performing a fully-analytical study, the Kraichnan advection model is considered. The white-in-time character of the latter model indeed leads to closed equations for the equal-time scalar correlation functions. The classical closure problem however still arises if a standard filtering procedure is applied to those equations in the spirit of the large-eddy-simulation strategy. We show both how to perform exact closures and how to identify the corresponding coarse-grained scalar evolution.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 18