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The effect of precession in a rotating sphere filled with fluid was studiedwith direct numerical simulations, both in the incompressible hydrodynamics(HD) and magnetohydrodynamics (MHD) scenarios. In both cases the asymptoticstate and its dependence with both rotating and precession frequency wasanalyzed. For the MHD case no self-sustaining dynamos were found for theprograde precession case, whereas on the other hand a critical retrogradeprecession frequency was found above which dynamo action is self-sustained. Itwas also found that these correspond to small-scale dynamos with a developedturbulent regime. Furthermore, it is observed the presence of reversals of themagnetic dipole moment with greater waiting times between reversals for smallerprecession frequencies.

Behavior of hydrodynamic and magnetohydrodynamic turbulence in a rotating sphere with precession and dynamo action