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SUMMARY:MechE Colloquium: On the effects of topography in rapidly rotating
  fluids: Experiments on the spin-up of a fluid in a straight cylinder with
  bottom topography
DTSTART:20240227T120000
DTEND:20240227T130000
DTSTAMP:20260916T044052Z
UID:ec99a07922227b0df4573bbc70e9112dc082c416d79c708f1c5bad86
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof Jérome Noir\, ETHZ\nAbstract: \nDeep seated planetary f
 luid envelops\, such as metallic cores or subsurface oceans\, play a funda
 mental role in the orbital evolution of the celestial objects via transfer
  of angular momentum and energy dissipation\, and the generation of a magn
 etic field or mixing of chemical species. From a dynamical stand point the
 se buried fluid envelops are rapidly rotating\, stably\, neutrally or uns
 tably stratified regions enclosed in a solid shell. The interest in their 
 dynamics dates back from the end of the 19th century when scientists propo
 sed to probe internal structures of planets and moons by monitoring their 
 rotation\, initiating research on how the presence of fluid layers can ref
 lect in their rotational dynamics. They first considered the hydrodynamics
  of rapidly rotating spherical shells\, then spheroidal shells and more re
 cently tri-axial ellipsoids. Meanwhile\, we have geodynamical arguments an
 d seismic observations suggesting that the Earth's Core-Mantle boundary (C
 MB) may not be a smooth surface but exhibit topographic features of variou
 s height and wavelengths\, which have not been considered so far. \n\nIn 
 this presentation\, I will briefly introduce the geophysical context and e
 xplain why the abundant results on the topic in oceanography and atmospher
 ic sciences may not apply to those deep fluid layers. I will then present 
 the results from a dedicated experimental study of the Spinup of a rapidly
  rotating fluid in a straight cylinder with chessboard-like topography at 
 the bottom as a proxy to address topography driven energy dissipation. I w
 ill show the particular role played by inertial waves to radiate the energ
 y away from the topography\, and shape the internal flows. I will conclude
  by presenting ongoing and future theoretical\, numerical and experimental
  investigations to gain further insights.\n\n\nBiography: \nJerome Noir's
  interests focus on rotating hydro and magneto-hydro dynamics of planet’
 s and moon's fluid layers such as metallic cores and subsurface oceans. Hi
 s research combine numerical simulations and laboratory experiments to und
 erstand how these fluid envelops contribute to the dissipation of energy\,
  transfer of angular momentum and magnetic field generation. As part of hi
 s experimental activities\, Jerome Noir is developing unique rapidly rotat
 ing apparatus and 2D/3D ultrasonic acoustic measurement systems for veloci
 metry in harsh environments and opaque fluids dedicated to the extreme mag
 neto-rotational dynamics.\n\nJerome Noir got his PhD in 2000 from the Univ
 ersity of Grenoble on the "Earth’s core dynamics induced by precession
 ”\, he then held a research associate position at UCLA from 2001 to 2010
  before joining ETH Zürich as the head of the experimental laboratory of 
 geophysical fluid dynamics in the Earth’s science department and study a
 dvisor of the geophysics Master. He is currently involved in a multidisci
 plinary Simons foundation project on "Fundamental Fluid Processes in Clima
 te\, Stellar and Planetary Modelling.\n\n 
LOCATION:MED 0 1418 https://plan.epfl.ch/?room==MED%200%201418 https://epf
 l.zoom.us/j/61626448592
STATUS:CONFIRMED
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