title: Rotating turbulence under "precession-like" perturbation.
abstract: The effects of changing the orientation of the rotation axis on homogeneous turbulence is considered. We perform direct numerical simulations on a periodic box of 1024(3) grid points, where the orientation of the rotation axis is changed (a) at a fixed time instant (b) regularly at time intervals commensurate with the rotation time scale. The former is characterized by a dominant inverse energy cascade whereas in the latter, the inverse cascade is stymied due to the recurrent changes in the rotation axis resulting in a strong forward energy transfer and large-scale structures that resemble those of isotropic turbulence.
authors.affiliation: University of Rome and INFN, 00133, Tor Vergata Rome, Italy. iyerpkartik@gmail.com.
authors.forename: Kartik P
authors.initials: KP
authors.lastname: Iyer
authors.affiliation: University of Rome and INFN, 00133, Tor Vergata Rome, Italy.
authors.forename: Irene
authors.initials: I
authors.lastname: Mazzitelli
authors.affiliation: University of Rome and INFN, 00133, Tor Vergata Rome, Italy.
authors.forename: Fabio
authors.initials: F
authors.lastname: Bonaccorso
authors.affiliation: Laboratory for Atmospheric and Space Physics, University of Colorado at Boulder, 80303, Boulder, CO, USA.|Institute for Mathematics Applied to Geosciences (IMAGe), CISL, NCAR, 80307-3000, Boulder, CO, USA.
authors.forename: Annick
authors.initials: A
authors.lastname: Pouquet
authors.affiliation: University of Rome and INFN, 00133, Tor Vergata Rome, Italy.
authors.forename: Luca
authors.initials: L
authors.lastname: Biferale
keywords: Topical Issue: Multi-scale phenomena in complex flows and flowing matter