Articolo in rivista, 2010, ENG, 10.1063/1.3431660

On the measurement of vortex filament lifetime statistics in turbulence

Biferale, Luca; Scagliarini, Andrea; Toschi, Federico

Univ Roma Tor Vergata; Ist Nazl Fis Nucl; Eindhoven Univ Technol; Eindhoven Univ Technol; Eindhoven Univ Technol

A numerical study of turbulence seeded with light particles is presented. We analyze the statistical properties of coherent, small-scale structures by looking at the trapping events of light particles inside vortex filaments. We study the properties of particles attracting set, measuring its fractal dimension and the probability that the separation between two particles remains within the dissipative scale, even for time lapses as long as the large-scale correlation time, T(L). We show how to estimate the vortex lifetime by studying the moment of inertia of bunches of particles, showing the presence of an exponential lifetime distribution, with events up to T(L). (C) 2010 American Institute of Physics. [doi:10.1063/1.3431660]

Physics of fluids (1994) 22 (6)

Keywords

Turbulent flows, Vortex dynamics, Particle laden flows, Lagrangian turbulence

CNR authors

Toschi Federico, Scagliarini Andrea

CNR institutes

IAC – Istituto per le applicazioni del calcolo "Mauro Picone"