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PRODID:-//Memento EPFL//
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SUMMARY:Noise radiation in aerofoil flows: a global stability analysis
DTSTART:20121113T101500
DTSTAMP:20260916T201409Z
UID:a7b67f9d292ed9e4b1341af90d6a4e8d18b8d5b81ca7553e154f2c07
CATEGORIES:Conferences - Seminars
DESCRIPTION:Miguel Fosas de Pando (LadHyX\, CNRS - Ecole Polytechnique)\nE
 ven in low-turbulence environments\, aerofoils can radiate substantial lev
 els of noise from the sole interaction between the boundary layers and the
  wake: experiments show that for moderate-to-high Reynolds number and smal
 l angles of incidence\, the sound spectrum is characterized by discrete to
 nes that are commonly perceived as a whistle.  The visualization of the f
 low reveals that the acoustic emission is correlated to the ringing of coh
 erent structures near the trailing edge\, suggesting a nontrivial interpla
 y between acoustics and hydrodynamics.\n\nAlthough this problem has receiv
 ed considerable attention since the 70's\, a satisfactory explanation for 
 the physical origins of the tones is still incomplete\, mainly due to the 
 intrinsic limitations of classical hydrodynamic stability theory for the a
 nalysis of long-distance feedback effects.  In this presentation\, we add
 ress the noise generation mechanism by means of linear global stability th
 eory.  The predictions from the linear analysis will be compared with non
 linear simulations and at that point\, the outreach of a global linear stu
 dy will be assessed.
LOCATION:CM011 http://plan.epfl.ch/?lang=fr&zoom=19&recenter_y=5864167.356
 08&recenter_x=730902.68394&layerNodes=fonds\,batiments\,labels\,events_sur
 face\,events_line\,events_label\,information\,parkings_publics\,arrets_met
 r
STATUS:CONFIRMED
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