Nonlinear Sciences – Chaotic Dynamics
Scientific paper
1999-03-15
Nonlinear Sciences
Chaotic Dynamics
8 pages, 3 figures
Scientific paper
10.1209/epl/i1999-00191-8
The role played on the scalar transport by a finite, not small, correlation time, $\tau_u$, for the noise velocity is investigated, both analytically and numerically. For small $\tau_u$'s a mechanism leading to enhancement of transport has recently been identified and shown to be dominating for any type of flow. For finite non-vanishing $\tau_u$'s we recognize the existence of a further mechanism associated with regions of anticorrelation of the Lagrangian advecting velocity. Depending on the extension of the anticorrelated regions, either an enhancement (corresponding to constructive interference) or a depletion (corresponding to destructive interference) in the turbulent transport now takes place.
Castiglione Paolo
Mazzino Andrea
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