Abstract

By using direct numerical simulations (DNS) at unprecedented resolution, we study turbulence underrotation in the presence of simultaneous direct and inverse cascades. The accumulation of energy at large scaleleads to the formation of vertical coherent regions with high vorticity oriented along the rotation axis. Byseeding the flowwithmillions ofinertialparticles,wequantify--forthefirsttime--theeffects ofthose coherentvertical structures on the preferential concentration of light and heavy particles. Furthermore, we quantitativelyshow that extreme fluctuations, leading to deviations from a normal-distributed statistics, result from theentangled interaction of the vertical structures with the turbulent background. Finally, we present the first-evermeasurement of the relative importance between Stokes drag, Coriolis force, and centripetal force along thetrajectories of inertial particles. We discover that vortical coherent structures lead to unexpected diffusionproperties for heavy and light particles in the directions parallel and perpendicular to the rotation axis.

Autore Pugliese

• Lanotte Alessandra Sabina

Tutti gli autori

• L. Biferale; F. Bonaccorso; I. M. Mazzitelli; M. A. T. van Hinsberg; A. S. Lanotte; S. Musacchio; P. Perlekar; F. Toschi

Titolo volume/Rivista

Physical review. X

Anno di pubblicazione

2016

ISSN

2160-3308

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

Ultimo Aggiornamento Citazioni

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Numero di citazioni Scopus

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Settori ERC

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Codici ASJC

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