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SUMMARY:Non-Modal Scattering over a Hard-Soft Wall Transition within a Cyl
 indrical Duct - Dr Matthew King
DTSTART:20230316T140000Z
DTEND:20230316T150000Z
UID:TALK198472@talks.cam.ac.uk
CONTACT:Shiza Naqvi
DESCRIPTION:When considering acoustics within a lined cylindrical duct\, a
  parallel sheared flow may be considered. However\, doing so introduces a 
 critical layer singularity resulting in a pressure field that consists of 
 the usual modal field and also a non-modal field.\nWhile early work sugges
 ted that while in many cases the non-modal contribution may be neglected w
 ithin the far-field\, more realistic flow profiles have revealed cases exi
 st where the non-modal component is comparable or even dominant in the far
 -field.\nWhen considering the scattering problem caused by a change in the
  duct wall boundary condition\, often used is a mode matching method\, whi
 ch naturally cannot account for the non-modal field. Instead\, the Wiener-
 Hopf technique may be utilised to account for these contributions without 
 resorting to just neglecting them. This allows us to their effects underst
 ood\, and has the potential for future comparisons to be made.\nIn this ta
 lk I will highlight the various effects that may impact the overall behavi
 or of the system\, setup and illustrate the solution to the resulting Wien
 er-Hopf problem\, and finally give my predictions for the overall behavior
  of the outgoing scattered field including the non-modal effect. This may 
 be completed for various incoming sound sources\, including ones that are 
 also non-modal.
LOCATION:MR14
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