Tilt-over mode in a precessing triaxial ellipsoid

Details Tilt-over mode in a precessing triaxial ellipsoid Tilt-over mode in a precessing triaxial ellipsoid

2011-02-12

arxiv.org/abs/1102.2500v1

Phys. Fluids 22, 116601 (2010)

Physics

Fluid Dynamics

http://link.aip.org/link/doi/10.1063/1.3504356

Scientific paper

10.1063/1.3504356

The tilt-over mode in a precessing triaxial ellipsoid is studied theoretically and numerically. Inviscid and viscous analytical models previously developed for the spheroidal geometry by Poincar\'e [Bull. Astr. 27, 321 (1910)] and Busse [J. Fluid Mech., 33, 739 (1968)] are extended to this more complex geometry, which corresponds to a tidally deformed spinning astrophysical body. As confirmed by three-dimensional numerical simulations, the proposed analytical model provides an accurate description of the stationary flow in an arbitrary triaxial ellipsoid, until the appearance at more vigorous forcing of time dependent flows driven by tidal and/or precessional instabilities.

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