2010
DOI: 10.1017/s0022112010000923
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Finite-size effects in the dynamics of neutrally buoyant particles in turbulent flow

Abstract: The dynamics of neutrally buoyant particles transported by a turbulent flow is investigated for spherical particles with radii of the order of the Kolmogorov dissipative scale or larger. The pseudo-penalization spectral method that has been proposed by Pasquetti et al. (Appl. Numer. Math., vol. 58, 2008, pp. 946-954) is adapted to integrate numerically the simultaneous dynamics of the particle and of the fluid. Such a method gives a unique handle on the limit of validity of pointparticle approximations, which… Show more

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Cited by 106 publications
(156 citation statements)
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“…Our results on the velocity and acceleration statistics reveal that buoyant spheres have very different dynamics from the well-explored class of neutrally buoyant particles in turbulence (Zimmermann et al 2011b;Toschi and Bodenschatz 2009;Homann and Bec 2010). We detect the influence of trailing wake, resulting in periodicity in the Lagrangian autocorrelations and anisotropy in the translational dynamics.…”
Section: Discussionmentioning
confidence: 69%
“…Our results on the velocity and acceleration statistics reveal that buoyant spheres have very different dynamics from the well-explored class of neutrally buoyant particles in turbulence (Zimmermann et al 2011b;Toschi and Bodenschatz 2009;Homann and Bec 2010). We detect the influence of trailing wake, resulting in periodicity in the Lagrangian autocorrelations and anisotropy in the translational dynamics.…”
Section: Discussionmentioning
confidence: 69%
“…As pointed out in Refs. [56,57], the point-particle approximation with the usual drag law is clearly not valid for these sizes of particle. The results from the LES with the model are compared with experimental results from Refs.…”
Section: Stochastic Response Time For a Particle Larger Than The mentioning
confidence: 93%
“…[56,57] for large particles dominantly swept by the large scales of the flow. Of course, this limit is beyond the validity of the "large pointwise" particle approach considered in this paper.…”
mentioning
confidence: 99%
“…For instance, while the dominant drag force assumption predicts a low-pass filtering effect of particles velocity fluctuations with increasing inertia, measurements show that the fluctuation level of inertial particles velocity remains identical to that of the carrier flow, even when the particle inertia is large. Similarly, Stokesian models predict a gaussianization of particles acceleration statistics as inertia is increased [1], while no such trend is observed experimentally for finite size inertial particles [10,5]. These observations address the question of the exact role of the drag force in the equation of motion of advected particles.…”
Section: Introductionmentioning
confidence: 97%