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SUMMARY:Modeling the waves and interactions of capillary surfers - Anand O
 za\, New Jersey Institute of Technology
DTSTART:20241120T140000Z
DTEND:20241120T150000Z
UID:TALK224491@talks.cam.ac.uk
CONTACT:Anna Walczyk
DESCRIPTION:We present a combined experimental and theoretical investigati
 on into "capillary surfers\," which are millimetric objects that self-prop
 el while floating at the interface of a vibrating fluid bath. Recent exper
 iments showed that surfer pairs may lock into one of seven bound states\, 
 and that larger collectives of surfers self-organize into coherent flockin
 g states. Our theoretical model for the surfers' positional and orientatio
 nal dynamics approximates a surfer as a pair of vertically oscillating poi
 nt sources of weakly viscous gravity-capillary waves. We derive an analyti
 cal solution for the associated interfacial deformation and thus the hydro
 dynamic force exerted by one surfer on another. Our model recovers the bou
 nd states found in experiments and exhibits good quantitative agreement wi
 th experimental data. Generally\, our work shows that self-propelling obje
 cts coupled by interfacial flows constitute a promising platform for study
 ing active matter systems in which both inertial and viscous effects are r
 elevant.
LOCATION:JDB Seminar RM
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