Intermittency in the velocity distribution of heavy particles in turbulence
| Autor: | Massimo Cencini, Federico Toschi, Alessandra S. Lanotte, Luca Biferale, Jérémie Bec |
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| Přispěvatelé: | Laboratoire de Cosmologie, Astrophysique Stellaire & Solaire, de Planétologie et de Mécanique des Fluides (CASSIOPEE), Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Fluids and Flows, Scientific Computing, Computational Multiscale Transport Phenomena (Toschi) |
| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: |
Physics
Turbulence Mechanical Engineering Nonlinear physics Mechanics Condensed Matter Physics 01 natural sciences Turbolence Inertial-particles Settore FIS/02 - Fisica Teorica Modelli e Metodi Matematici 010305 fluids & plasmas law.invention Physics::Fluid Dynamics Mechanics of Materials law Intermittency 0103 physical sciences Dissipative system Particle Particle velocity Two-phase flow Phase velocity 010306 general physics Stokes number |
| Zdroj: | Journal of Fluid Mechanics Journal of Fluid Mechanics, Cambridge University Press (CUP), 2010, 646, pp.527 Journal of fluid mechanics 646 (2010): 527–536. doi:10.1017/S0022112010000029 info:cnr-pdr/source/autori:J. Bec (1); L. Biferale (2); M. Cencini (3); A.S. Lanotte (4); F. Toschi (5,6)/titolo:Intermittency in the velocity distribution of heavy particles in turbulence/doi:10.1017%2FS0022112010000029/rivista:Journal of fluid mechanics (Print)/anno:2010/pagina_da:527/pagina_a:536/intervallo_pagine:527–536/volume:646 Journal of Fluid Mechanics, 646, 527-536. Cambridge University Press |
| ISSN: | 0022-1120 1469-7645 |
| DOI: | 10.1017/S0022112010000029 |
| Popis: | 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 20483 collocation points and with millions of particles for each Stokes number. |
| Databáze: | OpenAIRE |
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