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The decay of anisotropic turbulence (Articolo in rivista)
- Type
- Label
- The decay of anisotropic turbulence (Articolo in rivista) (literal)
- Anno
- 2003-01-01T00:00:00+01:00 (literal)
- Alternative label
L. Biferale, G. Boffetta, A. Celani, A. Lanotte, F. Toschi, and M. Vergassola (2003)
The decay of anisotropic turbulence
in Physics of fluids (1994)
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- L. Biferale, G. Boffetta, A. Celani, A. Lanotte, F. Toschi, and M. Vergassola (literal)
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- Contributo di rilevanza internazionale. (literal)
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- Biferale Univ. Tor Vergata, Roma
Boffetta Univ. Torino
Celani INLN-CNRS, Francia
Lanotte CNR-ISAC
Toschi CNR-IAC
Vergassola CNRS, Francia (literal)
- Titolo
- The decay of anisotropic turbulence (literal)
- Abstract
- We present the results of a numerical investigation of
three-dimensional decaying turbulence with statistically homogeneous
and anisotropic initial conditions. We show that at large times, in
the inertial range of scales: (i) isotropic velocity fluctuations
decay self-similarly at an algebraic rate which can be obtained
by dimensional arguments; (ii) the ratio of anisotropic to isotropic
fluctuations of a given intensity falls off in time as a power law,
with an exponent approximately independent of the strength of the
fluctuation; (iii) the decay of anisotropic fluctuations is not
self-similar, their statistics becoming more and more intermittent as
time elapses. We also investigate the early stages of the decay.
The different short-time behavior observed in two experiments differing
by the phase organization of their initial conditions gives a new hunch on
the degree of universality of small-scale turbulence statistics, i.e. its
independence of the conditions at large scales.
(literal)
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