About coherent structures in random shell models for passive scalar advection

Details About coherent structures in random shell models for passive scalar advection About coherent structures in random shell models for passive scalar advection

1999-08-30

arxiv.org/abs/chao-dyn/9909003v2

Nonlinear Sciences

Chaotic Dynamics

4 pages, 2 postscript figures, submitted to PRE

Scientific paper

10.1103/PhysRevE.60.R6299

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 in \cite{DDG99} 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.

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