https://doi.org/10.1140/epje/i2015-15128-x
Regular Article
Rotating turbulence under “precession-like” perturbation
1
University of Rome and INFN, 00133, Tor Vergata Rome, Italy
2
Laboratory for Atmospheric and Space Physics, University of Colorado at Boulder, 80303, Boulder, CO, USA
3
Institute for Mathematics Applied to Geosciences (IMAGe), CISL, NCAR, 80307-3000, Boulder, CO, USA
* e-mail: iyerpkartik@gmail.com
Received:
30
September
2015
Accepted:
12
November
2015
Published online:
7
December
2015
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 10243 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.
Key words: Topical Issue: Multi-scale phenomena in complex flows and flowing matter
© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg, 2015
