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16/5/2017 à 10h30: Séminaire de Simon Cabanes (LMD)

Rotating turbulent flows to investigate gas giants
Quand ? Le 16/05/2017,
de 10:30 à 12:30
Où ? Salle de réunion du LMD/Jussieu (T45-55, 3e étage)
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Téléphone 0144272799
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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.

Pour suivre le séminaire en visioconférence:
Adresse IP =
N° de conférence = 728025
Mot de passe = 2224

« Janvier 2018 »
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