𝔖 Bobbio Scriptorium
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SIMULATION OF ACOUSTIC SCATTERING FROM A TRAILING EDGE

✍ Scribed by B.A. SINGER; K.S. BRENTNER; D.P. LOCKARD; G.M. LILLEY

Book ID
102610928
Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
365 KB
Volume
230
Category
Article
ISSN
0022-460X

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✦ Synopsis

Three model problems were examined to assess the di$culties involved in using a hybrid scheme coupling #ow computation with the Ffowcs Williams and Hawkings equation to predict the noise generated by vortices passing over a sharp edge. The results indicate that the Ffowcs Williams and Hawkings equation correctly propagates the acoustic signals when provided with accurate #ow information on the integration surface. The most di$cult of the model problems investigated #ow over a two-dimensional, thin NACA airfoil with a blu!-body vortex generator positioned at 98% chord. Vortices rolled up downstream of the blu! 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.

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