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SUMMARY:Aeroacoustics and aerodynamics of quiet owl flight - Justin Jawors
 ki (Lehigh University)
DTSTART:20230526T114500Z
DTEND:20230526T124500Z
UID:TALK198583@talks.cam.ac.uk
CONTACT:Paras Vadher
DESCRIPTION:Many owl species rely on specialized plumage to mitigate their
  aerodynamic noise and achieve functionally-silent flight while hunting. O
 ne such plumage feature\, a tattered arrangement of flexible trailing-edge
  feathers\, is idealized as a semi-infinite poroelastic plate to model the
  effects that edge compliance and flow seepage have on the noise productio
 n. The associated acoustic scattering problem is solved to identify how th
 e noise scales with the flight velocity\, where special attention is paid 
 to the limiting cases of rigid-porous and elastic-impermeable plate condit
 ions. Results from this analysis identify new parameter spaces where the p
 orous and/or elastic properties of a trailing edge may be tailored to dimi
 nish or effectively eliminate the edge scattering effect and may contribut
 e to the owl hush-kit. In complement to the acoustic analysis\, steady and
  unsteady aerodynamic models including wing porosity are formulated and so
 lved in anticipation of the potential trade-off of aerodynamic performance
  and acoustic stealth. The aerodynamic analysis yields porous extensions o
 f the classical unsteady aerodynamic functions and further indicates how p
 orosity may be used as a passive gust rejection strategy.\n
LOCATION:LR5
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