Simulation of acoustic scattering from a trailing edge

B. A. Singer, Kenneth Steven Brentner, D. P. Lockard, G. M. Lilley

Research output: Contribution to journalArticle

66 Citations (Scopus)

Abstract

Three model problems were examined to assess the difficulties involved in using a hybrid scheme coupling flow computation with the Ffowcs Williams and Hawkings equation to predict the noise generated by vortices passing over a sharp edge. The results indicate that the Ffowcs Williams and Hawkings equation correctly propagates the acoustic signals when provided with accurate flow information on the integration surface. The most difficult of the model problems investigated flow over a two-dimensional, thin NACA airfoil with a bluff-body vortex generator positioned at 98% chord. Vortices rolled up downstream of the bluff body. The shed vortices possessed similarities to large coherent eddies in boundary layers in that they interacted and occasionally paired as they convected past the sharp trailing edge of the airfoil. The calculations showed acoustic waves emanating from the airfoil trailing edge. Acoustic directivity and Mach number scaling were obtained.

Original languageEnglish (US)
Pages (from-to)541-560
Number of pages20
JournalJournal of Sound and Vibration
Volume230
Issue number3
DOIs
StatePublished - Feb 24 2000

Fingerprint

acoustic scattering
trailing edges
Vortex flow
Acoustics
Airfoils
Scattering
vortices
bluff bodies
airfoils
acoustics
thin airfoils
simulation
vortex generators
information flow
sheds
Gas generators
directivity
Mach number
boundary layers
Boundary layers

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Singer, B. A. ; Brentner, Kenneth Steven ; Lockard, D. P. ; Lilley, G. M. / Simulation of acoustic scattering from a trailing edge. In: Journal of Sound and Vibration. 2000 ; Vol. 230, No. 3. pp. 541-560.
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Simulation of acoustic scattering from a trailing edge. / Singer, B. A.; Brentner, Kenneth Steven; Lockard, D. P.; Lilley, G. M.

In: Journal of Sound and Vibration, Vol. 230, No. 3, 24.02.2000, p. 541-560.

Research output: Contribution to journalArticle

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