Turbulence structure subjected to ''precession-like'' rotation

We report results from a series of numerical experiments in which the orientation of the rotation axis of a turbulent flow simulated in a periodic domain is arbitrarily changed. It is well known that rotation weakens spectral transfer and renders the flow anisotropic across all scales. However, when the orientation of rotation is changed, the spectral transfer becomes stronger and the flow becomes more isotropic. The large scale vortical structures aligned with the rotation are destroyed by the change in rotation axis. Based on these findings we attempt to discuss the dynamics of rotating turbulence subjected to precession.