Volume 45, Number 4, February II 1999
|Page(s)||476 - 481|
|Section||Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics|
|Published online||01 September 2002|
Interference phenomena in scalar transport induced by a noise finite correlation time
CNRS, Observatoire de Nice - B.P. 4229,
06304 Nice Cedex 4, France
2 INFM - Dipartimento di Fisica, Università di Genova - I-16146 Genova, Italy
3 INFM - Dipartimento di Fisica, Università "La Sapienza” - I-00185 Roma, Italy
Accepted: 29 November 1998
The role played on the scalar transport by a finite, not small, correlation time, , for the noise velocity is investigated, both analytically and numerically. For small '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 '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.
PACS: 47.27.Qb – Turbulent diffusion
© EDP Sciences, 1999
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