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 flowwithmillions ofinertialparticles,wequantify
--
forthefirsttime
--
theeffects ofthose 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 force 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.
Anno
2016
Autori IAC
Tipo pubblicazione
Altri Autori
L. Biferale, F. Bonaccorso, I. M. Mazzitelli, M. A. T. van Hinsberg, A. S. Lanotte, S. Musacchio, P. Perlekar, F. Toschi
Editore
American Physical Society
Rivista
Physical review. X