Lagrangian statistics of particle pairs in homogeneous isotropic turbulence (Articolo in rivista)

Type
Label
  • Lagrangian statistics of particle pairs in homogeneous isotropic turbulence (Articolo in rivista) (literal)
Anno
  • 2005-01-01T00:00:00+01:00 (literal)
Alternative label
  • Biferale L., Boffetta G., Celani A., Devenish B.J., Lanotte A., Toschi F. (2005)
    Lagrangian statistics of particle pairs in homogeneous isotropic turbulence
    in Physics of fluids (1994)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Biferale L., Boffetta G., Celani A., Devenish B.J., Lanotte A., Toschi F. (literal)
Pagina inizio
  • 115101 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 17 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
  • Google Scholar (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Dipartimento di Fisica, Università \"Tor Vergata,\" and INFN, Sezione di Roma II, Roma, Italy; Dipartimento di Fisica Generale and INFN, Università di Torino, Torino, Italy; CNRS, INLN, Valbonne, France; Dipartimento di Fisica, Università \"Tor Vergata,\" and INFN, Sezione di Roma II, Roma, Italy and The Met Office, Fitzroy Road, Exeter, United Kingdom; CNR, ISAC, Str. Prov. Lecce-Monteroni, Lecce, Italy; CNR, IAC, Viale del Policlinico 137, I-00161 Roma, Italy and INFN, Sezione di Ferrara, Ferrara, Italy (literal)
Titolo
  • Lagrangian statistics of particle pairs in homogeneous isotropic turbulence (literal)
Abstract
  • We present a detailed investigation of the particle pair separation process in homogeneous isotropic turbulence. We use data from direct numerical simulations up to Taylor's Reynolds number 280 following the evolution of about two million passive tracers advected by the flow over a time span of about three decades. We present data for both the separation distance and the relative velocity statistics. Statistics are measured along the particle pair trajectories both as a function of time and as a function of their separation, i.e. at fixed scales. We compare and contrast both sets of statistics in order to gain an insight into the mechanisms governing the separation process. We find very high levels of intermittency in the early stages, that is, for travel times up to order ten Kolmogorov time scales. The fixed scale statistics allow us to quantify anomalous corrections to Richardson diffusion in the inertial range of scales for those pairs that separate rapidly. It also allows a quantitative analysis of intermittency corrections for the relative velocity statistics. (literal)
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