| Issue |
Europhys. Lett.
Volume 45, Number 4, February II 1999
|
|
|---|---|---|
| Page(s) | 476 - 481 | |
| Section | Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics | |
| DOI | https://doi.org/10.1209/epl/i1999-00191-8 | |
| Published online | 01 September 2002 | |
Interference phenomena in scalar transport induced by a noise finite correlation time
1
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
Received:
11
September
1998
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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