By using direct numerical simulations (DNS) at unprecedented resolution we study turbulence under rotation in the presence of simultaneous direct and inverse cascades. The accumulation of energy at large scale leads to the formation of vertical coherent regions with high vorticity oriented along the rotation axis. By seeding the flow with millions of inertial particles, we quantify -for the first time- the effects of those coherent vertical structures on the preferential concentration of light and heavy particles. Furthermore, we quantitatively show that extreme fluctuations, leading to deviations from a normal-distributed statistics, result from the entangled interaction of the vertical structures with the turbulent background. Finally, we present the first-ever measurement of the relative importance between Stokes drag, Coriolis force and centripetal forces along the trajectories of inertial particles. We discover that vortical coherent structures lead to unexpected diffusion properties for heavy and light particles in the directions parallel and perpendicular to the rotation axis.

Biferale, L., Bonaccorso, F., Mazzitelli, I., van Hinsberg, M., Lanotte, A., Musacchio, S., et al. (2016). Coherent structures and extreme events in rotating multiphase turbulent flows. PHYSICAL REVIEW. X, 6(4), 1-14 [10.1103/PhysRevX.6.041036].

Coherent structures and extreme events in rotating multiphase turbulent flows

BIFERALE, LUCA;
2016

Abstract

By using direct numerical simulations (DNS) at unprecedented resolution we study turbulence under rotation in the presence of simultaneous direct and inverse cascades. The accumulation of energy at large scale leads to the formation of vertical coherent regions with high vorticity oriented along the rotation axis. By seeding the flow with millions of inertial particles, we quantify -for the first time- the effects of those coherent vertical structures on the preferential concentration of light and heavy particles. Furthermore, we quantitatively show that extreme fluctuations, leading to deviations from a normal-distributed statistics, result from the entangled interaction of the vertical structures with the turbulent background. Finally, we present the first-ever measurement of the relative importance between Stokes drag, Coriolis force and centripetal forces along the trajectories of inertial particles. We discover that vortical coherent structures lead to unexpected diffusion properties for heavy and light particles in the directions parallel and perpendicular to the rotation axis.
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici
English
Con Impact Factor ISI
Biferale, L., Bonaccorso, F., Mazzitelli, I., van Hinsberg, M., Lanotte, A., Musacchio, S., et al. (2016). Coherent structures and extreme events in rotating multiphase turbulent flows. PHYSICAL REVIEW. X, 6(4), 1-14 [10.1103/PhysRevX.6.041036].
Biferale, L; Bonaccorso, F; Mazzitelli, I; van Hinsberg, M; Lanotte, A; Musacchio, S; Perlekar, P; Toschi, F
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/173932
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