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SUMMARY:Self-organized flight formations disrupted by self-amplifying wave
 s - Leif Ristroph\, New York University
DTSTART:20230914T120000Z
DTEND:20230914T130000Z
UID:TALK204595@talks.cam.ac.uk
CONTACT:115657
DESCRIPTION:The idea that schools\, flocks\, and other forms of collective
  locomotion are like states or phases of matter is appealing. In this talk
 \, I'll show that indeed flapping flyers tend to order up into well-organi
 zed formations or lattices\, much like crystalline solids. We document the
 se structures through lab experiments on "mock flocks" of self-propelling 
 and hydrodynamically coupled robotic flyers. But we also observe a new typ
 e of traveling wave instability that amplifies as it propagates on the gro
 up\, upsetting the lattice positions and causing collisions. We call these
  flow-induced excitations "flonons" as a nod to phonons in material lattic
 es. A simplistic but informative model is able to reproduce the novel beha
 viors and helps to identify the key ingredients and causes. I'll end by th
 inking about implications for animal groups and why they may have properti
 es never before seen in conventional physical systems.
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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