http://www.cnr.it/ontology/cnr/individuo/prodotto/ID7765
The decay of homogeneous anisotropic turbulence (Articolo in rivista)
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- The decay of homogeneous anisotropic turbulence (Articolo in rivista) (literal)
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- 2003-01-01T00:00:00+01:00 (literal)
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Biferale L., Boffetta G., Celani A., Lanotte A., Toschi F., Vergassola M. (2003)
The decay of homogeneous anisotropic turbulence
in Physics of fluids (1994)
(literal)
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- Biferale L., Boffetta G., Celani A., Lanotte A., Toschi F., Vergassola M. (literal)
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- ISI Web of Science (WOS) (literal)
- Titolo
- The decay of homogeneous 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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