Accueil > Actualités > Séminaires > Séminaire de Simon Cabanes


Titre : Rotating turbulent flows to investigate gas giants
Nom du conférencier : Simon Cabanes
Son affiliation : LMD
Laboratoire organisateur : LMD
Date et heure : 16-05-2017 10h30
Lieu : UPMC - LMD - Tour 45/55 - 3e étage - salle de réunion
Résumé :

The strong east–west jet flows on the gas giants, Jupiter and  Saturn, have  persisted  for  hundreds  of  years.  Yet, experimental studies cannot reach the planetary regime and similarly strong and quasi-steady jets have been reproduced only in numerical models under simplifying assumptions and limitations. Two models have been proposed: a shallow model where jets are confined to the weather layer and a deep model where the jets extend into the planetary molecular  envelope. We will show in a hydrodynamic laboratory experiment that turbulent flows naturally  generate  multiple,  alternating jets  in  a  rapidly rotating cylindrical container. The observed properties of gas giants’ jets are only now reproduced in a laboratory device emulating the deep model. The device has been named the "Jovian Jets Jacuzzi". Our findings demonstrate that long-lived  jets  can  persist  at high  latitudes even  under conditions including viscous dissipation and friction and bear relevance to the shallow versus deep models debate in the context of the ongoing Juno mission.

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