| Issue |
Europhys. Lett.
Volume 34, Number 1, April I 1996
|
|
|---|---|---|
| Page(s) | 25 - 30 | |
| Section | Classical areas of phenomenology | |
| DOI | https://doi.org/10.1209/epl/i1996-00410-4 | |
| Published online | 01 September 2002 | |
Anomalous scaling behaviour of a passive scalar in the presence of a mean gradient
Institut Nonlinéaire de Nice, CNRS - 1361 route des Lucioles,
F-06560, Valbonne, France
Received:
3
January
1996
Accepted:
9
February
1996
The problem of mixing of a passive scalar by a Gaussian,
isotropic, random velocity field,
decorrelated in time, and with a power law scaling of the
velocity differences as 
is considered.
In the presence of an imposed mean scalar gradient,
the existence of an anomalous scaling exponent
of the three-point correlation function is established. The
exponent is explicitly computed in perturbation for small
values of ζ. The
result provides a qualitative explanation of several experimental
and numerical observations.
PACS: 47.27.Gs – Isotropic turbulence; homogeneous turbulence / 47.27.Te – Convection and heat transfer
© EDP Sciences, 1996
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