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VERSION:2.0
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SUMMARY:Study of acoustic sources in high subsonic turbulent jet flow
DTSTART:20120315T093000
DTSTAMP:20260428T082547Z
UID:6ebbcc9a21138fc9b0f7c8cc971a59418b44682e394021d362d52373
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Dominik Obrist\, Institute of Fluid Dynamics\, ETH Zurich\
 , Switzerland\nThe identification of acoustic sources in high subsonic jet
  flows at high Reynolds numbers is one of the most pertinent problems in t
 he field of aeroacoustics (sound generated by flows) not least because it 
 is also a problem of high social relevance (e.g. noise emissions from comm
 ercial aircraft at take-off).  In this seminar\, we will present a number
  of numerical and theoretical methods that have been recently developed in
  our group and that we are now using for the study of jet aeroacoustics. T
 his includes a high-fidelity solver for the direct noise computation for t
 urbulent jet flows which has been optimized for massively-parallel superco
 mputers\, as well as a far-field solver which is based on a spectral formu
 lation of Lighthill’s acoustic analogy. This spectral formulation has al
 so been used to develop a geometric theory which predicts the directivity 
 of acoustic emissions from wave packet disturbances. We will discuss this 
 theory in detail and will demonstrate how it can be related to modal solut
 ions obtained from the linear stability theory for compressible jet flows.
  Finally\, we will present results from a direct numerical simulation of a
  turbulent jet at Mach 0.9 and will discuss how the theoretical results fo
 r wave packets and modal disturbances may be connected to the actual noise
  sources of this jet.\n
LOCATION:MEB10
STATUS:CONFIRMED
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