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SUMMARY:MEchanics GAthering –MEGA- Seminar: Intro +  Unstable waves on a
  liquid filament
DTSTART:20260917T130500
DTEND:20260917T140000
DTSTAMP:20260916T125345Z
UID:2555c802e32942356ca2164a938e5c907cff8a219584303d158e2c4e
CATEGORIES:Conferences - Seminars
DESCRIPTION:Grégoire Le Lay (LFMI\, EPFL)\nFollowing a brief introductio
 n and welcome from the MEGA seminar committee there will be an inaugural s
 hort seminar.\n\nAbstract: We investiagte the nonlinear dynamics of a thin
  liquid stream flowing between two parallel glass plates that are narrowly
  spaced (forming what is known as a\nHele-Shaw cell). The behavior of this
  rivulet is governed by a complex coupling between the internal flow and t
 he geometry of the capillary interfaces. The competition between gravity\,
  inertia\, capillarity\, and viscosity in this system leads to a rich vari
 ety of dynamical regimes. \nWhen subjected to time-periodic acoustic over
 pressure\, the rivulet undergoes a parametric pattern-forming instability\
 , reminiscent of the Faraday instability in vibrated liquids. This instabi
 lity arises from the forced coupling between transverse and longitudinal d
 eformation modes. By employing a weakly nonlinear analysis\, we derive a f
 irst-principles model that describes the evolution of the rivulet under fo
 rcing. Our theoretical results show excellent agreement with experimental 
 observations\, accurately capturing the spatiotemporal structure of the ob
 served patterns.
LOCATION:ME B1 10 https://plan.epfl.ch/?room==ME%20B1%2010 https://epfl.zo
 om.us/j/68096021948?pwd=DiE8amDIwYw1u3VtW2xWNGKtioKL2y.1
STATUS:CONFIRMED
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