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A mushy source for the geysers of Enceladus

Samuel Boury (NYU Courant, Etats-Unis)
Quand ? Le 11/01/2022,
de 11:00 à 12:00
Où ? Salle des thèses
Participants Samuel Boury
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Motivated by Enceladus cryovolcanism and possible shear heating along its south pole fractures, we perform a theoretical and numerical study of boundary-layer convection along a vertical heated wall in a bounded ideal mushy region. By focusing on this simple model, we demonstrate the existence of four regions with different regimes and scalings that are studied asymptotically, showing a good agreement between the theory and the numerical simulations. Close to the heated wall, the convection in the mushy layer is similar to a rising buoyant plume abruptly stopped at the top, leading to increased pressure and temperature in the upper region, that could be the ignition of Enceladus' geysers.