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SUMMARY:Micro-locomotion near interfaces: studies on the motion of model m
 icro-swimmers around obstacles and under confinement - Dr. Nikhil Desai (U
 niversity of Cambridge)
DTSTART:20221027T113000Z
DTEND:20221027T123000Z
UID:TALK184979@talks.cam.ac.uk
CONTACT:Raymond E. Goldstein
DESCRIPTION:Interfaces affect the motion of micro-swimmers in interesting 
 ways\, owing to the boundary conditions that they enforce on the fluid flo
 w caused by the swimmer. In this talk\, I will present my research on the 
 modelling and analysis of micro-swimmer motion near fluid-fluid and fluid-
 solid interfaces.\n\nIn a first part\, we will see how ‘hydrodynamic tra
 pping’ of model micro-swimmers around spherical obstacles (e.g.\, oil dr
 ops) is fundamentally altered by surfactant-induced interfacial effects. O
 n a related note\, we will also discuss the dynamics of microorganisms in 
 an asymmetric confinement: an air-liquid interface on one side and a liqui
 d-liquid interface on the other\, and highlight the utility of far-field h
 ydrodynamic models in predicting swimming behaviour near interfaces.\n\nIn
  a second part\, we will move to studying active drops: physico-chemically
  symmetric entities that convert chemical energy from their surroundings t
 o spontaneous mechanical motion\, via self-sustained surface flows. These 
 drops typically evolve near rigid walls yet existing theories neglect this
  effect of confinement on the analysis of drop motion. Through numerical s
 imulations\, I will provide physical insights into the influence of wall p
 roximity on the motion of active drops along the wall. Specifically\, I wi
 ll explain why reduced drop-wall separations actually promote the drop’s
  self-propulsion.
LOCATION:MR15\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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