  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.
