Inertial waves generated by circular oscillations of inner core in a rotating spherical cavity

Abstract

The fluid flow excited by a core oscillating in a rotating spherical cavity is experimentally investigated. The core performs circular oscillations around the rotation axis under the action of an external inertial field and generates inertial waves. The main attention is paid to the effect of the oscillation frequency on the instantaneous flow structure and intensity. It is found that at a certain frequency, inertial waves experience spatial resonance, resulting in the intensification of oscillatory flow.