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SUMMARY:MEchanics GAthering –MEGA- Seminar: Reduced order model of drops
  bouncing on a vibrating surface
DTSTART:20240328T161500
DTEND:20240328T171500
DTSTAMP:20260414T211754Z
UID:c48da4a2c46aba7b8ee486463dba370654632ec93d6f742cc06c61d3
CATEGORIES:Conferences - Seminars
DESCRIPTION:Tomas Fullana (LFMI\, EPFL) \nAbstract: Drops exhibit fasci
 nating rebound behavior when interacting with superhydrophilic solid surfa
 ces\, such as atomically smooth mica sheets. Experimental observations sho
 w that drop bouncing occurs without the drop ever touching the solid and t
 here is a nanometer-scale film of air that separates the liquid and solid.
  In the case of a vibrating stage\, the drop can either remain in a 'bound
 ' state\, that will eventually lead to contact\, or enter a sustained 'bou
 ncing' state triggering harmonic oscillations. We investigate the bouncing
  and period-doubling thresholds up until chaos for varying peak stage acce
 lerations and vibration numbers corresponding to the ratio between the for
 cing frequency and the characteristic drop oscillation frequency. We use t
 he free software basilisk to solve the two-phase Navier-Stokes equations i
 n an axisymmetric formulation. The numerical results demonstrate a remarka
 ble agreement with experimental observations\, facilitating a comprehensiv
 e exploration of the system's dynamics and allowing us to extend the regim
 e diagram of previous work on a similar setup. Extracting the coefficient 
 of restitution and the characteristic 'contact-time'\, we can cast a simpl
 ified nonlinear spring model that accurately predicts the drop center osci
 llation. Furthermore\, by decomposition of the drop shape with the second 
 spherical harmonic mode\, corresponding to an ellipsoidal deformation\, we
  can couple the drop center of mass to its deformation\n\nBiography: Toma
 s obtained a PhD in mechanics in 2022 from Sorbonne Université. He is now
  a post-doc at EPFL at the Laboratory of Fluid Mechanics and Instabilities
 .
LOCATION:MED 0 1418 https://plan.epfl.ch/?room==MED%200%201418 https://epf
 l.zoom.us/j/67041786969?pwd=a1lXa3lsVGpvL1VpN2RDR2l4clg0QT09
STATUS:CONFIRMED
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