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SUMMARY:Owl-inspired mechanisms of turbulence noise reduction - Justin Jaw
 orski (Lehigh University)
DTSTART:20190815T123000Z
DTEND:20190815T130000Z
UID:TALK128608@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:Many owl species rely on specialized plumage to mitigate their
  aerodynamic noise and achieve functionally-silent flight while hunting.  
 One such plumage feature\, a tattered arrangement of flexible trailing-edg
 e feathers\, is idealized as a semi-infinite poroelastic plate to model th
 e effects that edge compliance and flow seepage have on the noise producti
 on.  The interaction of the poroelastic edge with a turbulent eddy is exam
 ined analytically with respect to how efficiently the edge scatters the ed
 dy as aerodynamic noise. The scattering event is formulated and solved as 
 a scalar Wiener-Hopf problem to identify how the noise scales with the fli
 ght velocity\, where special attention is paid to the limiting cases of ri
 gid-porous and elastic-impermeable plate conditions. Results from this ana
 lysis identify new parameter spaces where the porous and/or elastic proper
 ties of a trailing edge may be tailored to diminish or effectively elimina
 te the edge scattering effect and may contribute to the owl hush-kit.
LOCATION:Seminar Room 1\, Newton Institute
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