Anomalous scaling and universality in turbulent systems with power-law forcing (Comunicazione a convegno)

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Label
  • Anomalous scaling and universality in turbulent systems with power-law forcing (Comunicazione a convegno) (literal)
Anno
  • 2004-01-01T00:00:00+01:00 (literal)
Alternative label
  • A. S. Lanotte 1,2, L. Biferale 2,3, M. Cencini 4, M. Sbragaglia 3, and F. Toschi 2,5 (2004)
    Anomalous scaling and universality in turbulent systems with power-law forcing
    in Annual meeting INFM, Genova, Giugno 2004
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • A. S. Lanotte 1,2, L. Biferale 2,3, M. Cencini 4, M. Sbragaglia 3, and F. Toschi 2,5 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • \address{\dag\ Dip. di Fisica and INFM, Universit\`a \"Tor Vergata\", Via della Ricerca Scientifica 1, I-00133 Roma, Italy} \address{\P\ Center for Statistical Mechanics and Complexity, 1 CNR ISAC, Lecce, Italy 2 INFM, Sez. Roma II, Rome, Italy 3 Dip. Fisica, Univ. Roma II, Rome, Italy 4 INFM Roma ``La Sapienza'' and Dipartimento di Fisica, Univ. \"La Sapienza\", Roma, Italy 5 CNR IAC, Rome, Italy (literal)
Titolo
  • Anomalous scaling and universality in turbulent systems with power-law forcing (literal)
Abstract
  • The problem of the interplay between normal and anomalous scaling in turbulent systems stirred by a random forcing with a power law spectrum is addressed [1]. By means of direct numerical simulations, we consider both linear and nonlinear systems. As for the linear case, we study passive scalars advected by a d$ velocity field in the inverse cascade regime. For the nonlinear case, we review a recent investigation of d$ Navier-Stokes turbulence [2], and we present new quantitative results for shell models of turbulence.\ We show [3] that at varying the forcing spectrum slope, small-scale turbulent fluctuations change from a {\it forcing independent} to a {\it forcing dominated} statistics. If $y_c$ is the critical value of the spectrum slope separating the two regimes, we find that when the statistics is forcing dominated, for $yy_c$, we find the same anomalous scaling measured in flows forced at large scales.\ We also show that to get firm statements it is necessary to reach considerably high resolutions due to the presence of unavoidable subleading terms affecting all correlation functions. All findings support universality of anomalous scaling for the small scale fluctuations. (literal)
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