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SUMMARY:MEchanics GAthering –MEGA- Seminar: Investigating surprising phe
 nomena at a liquid interface
DTSTART:20250515T161500
DTEND:20250515T170000
DTSTAMP:20260528T031121Z
UID:c77152e99573add113eb94e33d932e1085866941925fd0e7451d8946
CATEGORIES:Conferences - Seminars
DESCRIPTION:Benjamin Apffel (LWE\, EPFL)\nAbstract: During this seminar\,
  I will present several surprising phenomena that can occur at a liquid in
 terface under suitable experimental conditions. In a first part\, I will s
 how how high frequency vertical vibrations can be used to stabilize a liqu
 id layer above an air cushion. Buoyant objects can moreover float at the l
 ower interface in a way that will be discussed. Some generalization with n
 on-vertical or spatially inhomogeneous shaking will also be considered. In
  a second part\, I will show how an object performing circular trajectorie
 s can be brought closer from its rotation center when the rotation speed i
 ncreases. Such effect occurs when one stirs the water surface with a small
  floating ball attached to a deformable string. The combination of the str
 ing’s deformation and fluid’s action leads to a wide variety of ball
 ’s trajectories that will be described. In particular\, I will discuss t
 he existence of robust self-trapped states\, in which the ball traps itsel
 f at the rotation center.\n\nBio: Benjamin is a postdoc at the Laboratory
  of Wave Engineering at EPFL\, where he explores the interplay between top
 ology and nonlinearities in wave physics\, with applications in parametric
  instability control. He completed his PhD in physics at the Institut Lang
 evin (ESPCI-PSL)\, where he developed experimental platforms for studying 
 time-varying media using electrically controlled water waves\, and investi
 gated high-frequency vibration-induced stabilization in fluids. He holds a
  Bachelor’s and Master’s degree from the ICFP program at École Normal
 e Supérieure (Paris)\, with a focus on quantum mechanics.
LOCATION:MED 1 1518 https://plan.epfl.ch/?room==MED%201%201518 https://epf
 l.zoom.us/j/67041786969?pwd=a1lXa3lsVGpvL1VpN2RDR2l4clg0QT09
STATUS:CONFIRMED
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