Spatial and velocity statistics of inertial particles in turbulent flows (Contributo in atti di convegno)

Type
Label
  • Spatial and velocity statistics of inertial particles in turbulent flows (Contributo in atti di convegno) (literal)
Anno
  • 2011-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/1742-6596/333/1/012003 (literal)
Alternative label
  • J. Bec (1); L. Biferale (2,5); M, Cencini (3); A.S. Lanotte (4); F. Toschi (5,6) (2011)
    Spatial and velocity statistics of inertial particles in turbulent flows
    in Particles in Turbulence 2011 : International Conference on Fundamentals, Experiments, Numeric and Applications, Potsdam, Germany, 16-18 March, 2011
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • J. Bec (1); L. Biferale (2,5); M, Cencini (3); A.S. Lanotte (4); F. Toschi (5,6) (literal)
Pagina inizio
  • 012003 (literal)
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  • Sito conferenza: http://mp0806.cineca.it/potsdam/ (literal)
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  • http://iopscience.iop.org/1742-6596/333/1/012003/ (literal)
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  • 333 (literal)
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  • conference1 (literal)
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  • 1 Université de Nice-Sophia Antipolis, CNRS, OCA, Lab. Cassiopée, B.P. 4229, 06300 Nice, France 2 Department Physics and INFN, University of Rome \"Tor Vergata\", Via della Ricerca Scientifica 1, 00133 Rome, Italy 3 CNR-ISC, Via dei Taurini 19, 00185 Rome, Italy 4 CNR-ISAC & INFN-Sez. di Lecce, Str. Prov. Lecce-Monteroni, 73100 Lecce, Italy 5 Department of Physics Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands 6 Department of Mathematics and Computer Science, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands and CNR-IAC, Via dei Taurini 19, 00185 Rome, Italy (literal)
Titolo
  • Spatial and velocity statistics of inertial particles in turbulent flows (literal)
Abstract
  • Spatial and velocity statistics of heavy point-like particles in incompressible, homogeneous, and isotropic three-dimensional turbulence is studied by means of direct numerical simulations at two values of the Taylor-scale Reynolds number Re-lambda similar to 200 and Re-lambda similar to 400, corresponding to resolutions of 512(3) and 2048(3) grid points, respectively. Particles Stokes number values range from St approximate to 0.2 to 70. Stationary small-scale particle distribution is shown to display a singular -multifractal- measure, characterized by a set of generalized fractal dimensions with a strong sensitivity on the Stokes number and a possible, small Reynolds number dependency. Velocity increments between two inertial particles depend on the relative weight between smooth events - where particle velocity is approximately the same of the fluid velocity-, and caustic contributions - when two close particles have very different velocities. The latter events lead to a non-differentiable small-scale behaviour for the relative velocity. The relative weight of these two contributions changes at varying the importance of inertia. We show that moments of the velocity difference display a quasi bi-fractal-behavior and that the scaling properties of velocity increments for not too small Stokes number are in good agreement with a recent theoretical prediction made by K. Gustavsson and B. Mehlig arXiv:1012.1789v1 [physics.fludyn], connecting the saturation of velocity scaling exponents with the fractal dimension of particle clustering. (literal)
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