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SUMMARY:From noise in jets and wind turbines to relativity - Samuel Sinayo
 ko\, CUED and University of Southampton
DTSTART:20131122T130000Z
DTEND:20131122T140000Z
UID:TALK46956@talks.cam.ac.uk
CONTACT:Dr Henry Burridge
DESCRIPTION:This seminar will present a journey into the acoustics of turb
 ulent\nflows. It will start with jet noise\, one of the most challenging\n
 topics in fluid mechanics\, for which we have developed a new theory\nfor 
 identifying the noise sources. It relies on filtering the flow in\nthe fre
 quency-wavenumber domain to separate hydrodynamic fluctuations\nfrom acous
 tic fluctuations. The theory has been applied to jets\nobtained by direct 
 numerical simulation and it provides greater\nphysical insights than class
 ical acoustic analogies.\n\nWe will then discuss recent theoretical findin
 gs on trailing edge\nnoise\, the dominant source of wind turbine noise. Th
 ese findings have\nput an end to a long standing controversy on a popular 
 method for\npredicting trailing edge noise for rotating aerofoils. They sh
 ow how\none can extend theoretical\, numerical or experimental results for
  an\naerofoil sitting in a wind tunnel to a rotating aerofoil.\n\nWe will 
 conclude by focusing on one key aspect of both problems:\nunderstanding th
 e peculiar geometry of acoustic waves in fluid flows.\nThis geometry will 
 be brought to light by introducing a newly defined\nacoustic space-time in
 spired by the theory of special relativity.
LOCATION:LR3B\, Inglis Building\, CUED 
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