The flow of a fluid in a rapidly rotating spherical shell whose rotation rate is modulated sinusoidally in time is simulated numerically. Different inertial modes are excited as the modulation frequency is varied. The inertial modes are structured by internal layers. Internal layers are reflected at the boundaries such that at certain modulation frequencies, the layers are focused onto ``attractors'' after multiple reflections. The geometric properties of these attractors and their relevance for the response of the fluid is investigated.
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A. Tilgner (1999) studied this question.
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