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...
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2010 (v1)Journal articleUploaded on: December 3, 2022
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2010 (v1)Journal article
Journal of Fluid Mechanics, 645, p. 497 (2010)
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2006 (v1)Journal article
Physics of Fluids, 18, p. 1702, http://dx.doi.org./10.1063/1.2338598
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2005 (v1)Journal article
he statistical properties of fluid particles transported by a three-dimensional fully developed turbulent flow are investigated by means of high resolution direct numerical simulations. Single trajectory statistics are investigated in a time range spanning more than three decades, from less than a tenth of the Kolmogorov time scale, , up to one...
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2004 (v1)Conference paper
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2006 (v1)Journal article
The statistics of Lagrangian particles transported by a three-dimensional fully developed turbulent flow is investigated by means of high-resolution direct numerical simulations. The analysis of single trajectories reveals the existence of strong trapping events vortices at the Kolmogorov scale which contaminates inertial range statistics up to...
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2002 (v1)Conference paper
Conference on Advances in Turbulence IX (ETC-9)}, Southampton, U.K., 2-5 Juillet 2002
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2003 (v1)Journal article
We present the results of a numerical investigation of three-dimensional decaying turbulence with statistically homogeneous and anisotropic initial conditions. We show that at large times, in the inertial range of scales: (i) isotropic velocity fluctuations decay self-similarly at an algebraic rate which can be obtained by dimensional...
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2007 (v1)Journal article
Physical Review Letters, 98, p. 84502, http://dx.doi.org./10.1103/PhysRevLett.98.084502
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2006 (v1)Journal article
Physics of Fluids, 18, p. 1702, http://dx.doi.org./10.1063/1.2349587
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2005 (v1)Journal article
The statistical geometry of dispersing Lagrangian clusters of four particles (tetrahedra) is studied by means of high-resolution direct numerical simulations of three-dimensional homogeneous isotropic turbulence. We give the first evidence of a self-similar regime of shape dynamics characterized by almost two-dimensional, strongly elongated...
Uploaded on: December 4, 2022 -
2004 (v1)Journal article
he statistical properties of velocity and acceleration fields along the trajectories of fluid particles transported by a fully developed turbulent flow are investigated by means of high resolution direct numerical simulations. We present results for Lagrangian velocity structure functions, the acceleration probability density function, and the...
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2005 (v1)Journal article
We present a detailed investigation of the particle pair separation process in homogeneous isotropic turbulence. We use data from direct numerical simulations up to Taylor\'s Reynolds number 280 following the evolution of about two million passive tracers advected by the flow over a time span of about three decades. We present data for both the...
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2006 (v1)Journal article
Journal of Turbulence, 7, p. 36, http://dx.doi.org./10.1080/14685240600675727
Uploaded on: December 4, 2022 -
2006 (v1)Journal article
We present the results of Direct Numerical Simulations (DNS) of turbulent flows seeded with millions of passive inertial particles. The maximum Taylor's Reynolds number is around 200. We consider particles much heavier than the carrier flow in the limit when the Stokes drag force dominates their dynamical evolution. We discuss both the...
Uploaded on: December 3, 2022