Intermittency in the velocity distribution of heavy particles in turbulence (Articolo in rivista)

Type
Label
  • Intermittency in the velocity distribution of heavy particles in turbulence (Articolo in rivista) (literal)
Anno
  • 2010-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1017/S0022112010000029 (literal)
Alternative label
  • J. Bec (1); L. Biferale (2); M. Cencini (3); A.S. Lanotte (4); F. Toschi (5,6) (2010)
    Intermittency in the velocity distribution of heavy particles in turbulence
    in Journal of fluid mechanics (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • J. Bec (1); L. Biferale (2); M. Cencini (3); A.S. Lanotte (4); F. Toschi (5,6) (literal)
Pagina inizio
  • 527 (literal)
Pagina fine
  • 536 (literal)
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  • 646 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
  • fasc.(1). Cambridge University Press. (literal)
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  • 10 (literal)
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  • 1 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • (1) Université de Nice-Sophia Antipolis, CNRS, Observatoire de la Cote d 'Azur, Laboratoire Cassiopèe, Bd.de l'Observatoire, 06300 Nice, France (2) Department of Physics and INFN, University of Rome Tor Vergata,Via della Ricerca Scientica 1, 00133 Rome, Italy (3) INFM-CNR, SMC Dept.of Physics,Università 'La Sapienza ', P.zzle A.Moro 2, and ISC-CNR, Via dei Taurini 19,00185 Roma, Italy (4) ISAC-CNR, Via Fosso del Cavaliere 100, 00133 Rome and INFN, Sez.Lecce,73100 Lecce, Italy (5) Department of Physics and Department of Mathematics and Computer Science, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands (6) Istituto per le Applicazioni del Calcolo CNR, Viale del Policlinico 137, 00161 Roma, Italy (literal)
Titolo
  • Intermittency in the velocity distribution of heavy particles in turbulence (literal)
Abstract
  • The statistics of velocity differences between pairs of heavy inertial point particles suspended in an incompressible turbulent flow is studied and found to be extremely intermittent. The problem is particularly relevant to the estimation of the efficiency of collisions among heavy particles in turbulence. We found that when particles are separated by distances within the dissipative subrange, the competition between regions with quiet regular velocity distributions and regions where very close particles have very different velocities (caustics) leads to a quasi bi-fractal behaviour of the particle velocity structure functions. Contrastingly, we show that for particles separated by inertial-range distances, the velocity-difference statistics can be characterized in terms of a local roughness exponent, which is a function of the scale-dependent particle Stokes number only. Results are obtained from high-resolution direct numerical simulations up to 2048 3 collocation points and with millions of particles for each Stokes number. (literal)
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