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Intermittency in the relative separations of tracers and of heavy particles in turbulent flows

Published online by Cambridge University Press:  23 September 2014

L. Biferale ,
A. S. Lanotte ,
R. Scatamacchia  and
F. Toschi
L. Biferale*
Affiliation:
Department of Physics and INFN, University of Tor Vergata, Via della Ricerca Scientifica 1, 00133 Rome, Italy
A. S. Lanotte
Affiliation:
CNR-ISAC and INFN-Sez. Lecce, Str. Prov. Lecce-Monteroni, 73100 Lecce, Italy
R. Scatamacchia
Affiliation:
Department of Physics and INFN, University of Tor Vergata, Via della Ricerca Scientifica 1, 00133 Rome, Italy Department of Physics, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands
F. Toschi
Affiliation:
Department of Physics, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands Department of Mathematics and Computer Science, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands CNR-IAC, Via dei Taurini 19, 00185 Rome, Italy
*
†Email address for correspondence: biferale@roma2.infn.it
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Abstract

Results from direct numerical simulations (DNS) of particle relative dispersion in three-dimensional homogeneous and isotropic turbulence at Reynolds number $\def \xmlpi #1{}\def \mathsfbi #1{\boldsymbol {\mathsf {#1}}}\let \le =\leqslant \let \leq =\leqslant \let \ge =\geqslant \let \geq =\geqslant \def \Pr {\mathit {Pr}}\def \Fr {\mathit {Fr}}\def \Rey {\mathit {Re}}{\mathit{Re}}_{\lambda } \sim 300$ are presented. We study point-like passive tracers and heavy particles, at Stokes number $\mathit{St}=0.6,1$ and 5. Particles are emitted from localised sources, in bunches of thousands, periodically in time, allowing an unprecedented statistical accuracy to be reached, with a total number of events for two-point observables of the order of ${10^{11}}$ . The right tail of the probability density function (PDF) for tracers develops a clear deviation from Richardson’s self-similar prediction, pointing to the intermittent nature of the dispersion process. In our numerical experiment, such deviations are manifest once the probability to measure an event becomes of the order of – or rarer than – one part over one million, hence the crucial importance of a large dataset. The role of finite-Reynolds-number effects and the related fluctuations when pair separations cross the boundary between viscous and inertial range scales are discussed. An asymptotic prediction based on the multifractal theory for inertial range intermittency and valid for large Reynolds numbers is found to agree with the data better than the Richardson theory. The agreement is improved when considering heavy particles, whose inertia filters out viscous scale fluctuations. By using the exit-time statistics we also show that events associated with pairs experiencing unusually slow inertial range separations have a non-self-similar PDF.

JFM classification

Turbulent Flows: Intermittency Multiphase and Particle-laden Flows: Multiphase and Particle-laden Flows Mixing: Turbulent mixing

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Type
Papers
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Journal of Fluid Mechanics , Volume 757 , 25 October 2014 , pp. 550 - 572
Copyright
© 2014 Cambridge University Press 

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