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.
Iyer, K., Mazzitelli, I., Bonaccorso, F., Pouquet, A., Biferale, L. (2015). Rotating turbulence under “precession-like” perturbation. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER, 38(12), 1-7 [10.1140/epje/i2015-15128-x].
Rotating turbulence under “precession-like” perturbation
BIFERALE, LUCA
2015-01-01
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.| File | Dimensione | Formato | |
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