| Issue |
Europhys. Lett.
Volume 37, Number 2, January II 1997
|
|
|---|---|---|
| Page(s) | 85 - 90 | |
| Section | General | |
| DOI | https://doi.org/10.1209/epl/i1997-00116-1 | |
| Published online | 01 September 2002 | |
Fourth-order moments of longitudinal- and transverse-velocity structure functions
1
Department of Mechanical Engineering, University of Newcastle, N.S.W. 2308, Australia
2
Génie des Procédés, Université de Marne la Vallée, 93166 Noisy le Grand Cedex, France
3
IRPHE, CNRS/Université d'Aix-Marseille - 13003 Marseille, France
Received:
5
August
1996
Accepted:
27
November
1996
The relationship between fourth-order moments of 
and 
, the longitudinal- and
transverse-velocity increments, respectively, is examined in some detail in the
context of local isotropy and internal intermittency. Measurements in a plane
jet at a sufficiently large value of the turbulence Reynolds number indicate an
inertial-range behaviour of the flatness factors of and that is in reasonable
agreement with the lognormal hypothesis of Kolmogorov and the log-Poisson model.
In the inertial range, the fourth-order structure function exhibits a moderately
larger departure from local isotropy than the second-order structure function.
PACS: 05.40.+j – Fluctuation phenomena, random processes, and Brownian motion / 05.45.+b – Theory and models of chaotic systems / 47.27.Gs – Isotropic turbulence; homogeneous turbulence
© EDP Sciences, 1997
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