Fluid dynamics between two rotating spheres
What is it about?
Interiors of planets and stars are usually in the form of spherical layers of fluid. To study the effect of rotation on these layers, we study what happens when a fluid is trapped in between two spheres and they are rotated at different rates. We perform computer simulations and compare with real life experiments and reproduce the experimental results. Oscillatory motions (called "inertial modes") of unknown origin have been observed in this system since experiments in Maryland, USA in 2007. We address this question with a new paradigm involving resonances among different modes. In addition, we also show how these modes change their structure and frequency when the differential rotation is changed.
Why is it important?
We show how these oscillatory modes, often detected in stars, change from their theoretical selves in the presence of background differential rotation. This has never been done before for realistic flow profiles. This provides a framework of further studying mode modifications by flows which would have profound consequences in terms of mode identification in astrophysical objects. Secondly, we have identified a possible mechanism by which these modes might be generated - providing further insight into the state of the interiors of real astrophysical objects.
The following have contributed to this page: Ankit Barik
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