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Acceleration statistics of heavy particles in turbulence (Articolo in rivista)

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Acceleration statistics of heavy particles in turbulence (Articolo in rivista) (literal)

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Bec, J; Biferale, L; Boffetta, G; Celani, A; Cencini, M; Lanotte, A; Musacchio, S; Toschi, F (2006)
Acceleration statistics of heavy particles in turbulence
in Journal of fluid mechanics (Print)
(literal)

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Bec, J; Biferale, L; Boffetta, G; Celani, A; Cencini, M; Lanotte, A; Musacchio, S; Toschi, F (literal)

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CNRS, Observ Cote Azur, F-06304 Nice 4, France; Univ Roma Tor Vergata, Dept Phys, I-00133 Rome, Italy; Univ Roma Tor Vergata, Ist Nazl Fis Nucl, I-00133 Rome, Italy; Univ Turin, Dept Phys, I-10125 Turin, Italy; Univ Turin, Ist Nazl Fis Nucl, I-10125 Turin, Italy; CNRS, INLN, F-06560 Valbonne, France; Univ Roma La Sapienza, Dept Phys, SMC, INFM, I-00185 Rome, Italy; CNR, ISC, I-00185 Rome, Italy; CNR, ISAC, Sez Leece, I-73100 Lecce, Italy; Univ Roma La Sapienza, Dept Phys, I-00185 Rome, Italy; Ist Nazl Fis Nucl, Sez Ferrara, I-44100 Ferrara, Italy; CNR, IAC, I-00161 Rome, Italy (literal)

Titolo

Abstract

We present the results of direct numerical simulations of heavy particle transport in homogeneous, isotropic, fully developed turbulence, up to resolution 512(3) (R-lambda approximate to 185). Following the trajectories of up to 120 million particles with Stokes numbers, St, in the range from 0.16 to 3.5 we are able to characterize in full detail the statistics of particle acceleration. We show that: (i) the root-mean-squared acceleration arms sharply falls off from the fluid tracer value at quite small Stokes numbers; (ii) at a given St the normalized acceleration a(rms)/(is an element of(3)/nu)(1/4) increases with R-lambda consistently with the trend observed for fluid tracers; (iii) the tails of the probability density function of the normalized acceleration a/a(rms) decrease with St. Two concurrent mechanisms lead to the above results: preferential concentration of particles, very effective at small St. and filtering induced by the particle response time, that takes over at larger St. (literal)

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