Ecoulements induits par les librations forcées dans les couches liquides des planètes

Abstract

Orbital dynamics that lead to forced longitudinal libration of celestial bodies also result in an elliptically deformed equatorial core-mantle boundary. In the present study, we investigate the effect of the topographic coupling on the flow in the liquid layers of a librating planet through a coupled numerical-experimental approach. We report the first evidence of libration-driven elliptical instability in a non-axisymmetric container. It is shown that intermittent turbulence, characteristic of such instabilities, is associated with an enhanced zonal flow

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