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Scattering of Sound Waves by a Compressible Vortex

Colonius, Tim and Lele, Sanjiva K. and Moin, Parviz (1991) Scattering of Sound Waves by a Compressible Vortex. In: 29th Aerospace Sciences Meeting, 7-10 January 1991, Reno, NV.

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Scattering of plane sound waves by a compressible vortex is investigated by direct computation of the 2-d Navier-Stokes equations. Non-reflecting boundary conditions are utilized, and their accuracy is established by comparing results on different sized domains. Scattered waves are directly measured from the computations. The resulting amplitude and directivity pattern of the scattered waves is discussed, and compared to various theoretical predictions. For compact vortices (zero circulation), the scattered waves directly computed are in good agreement with predictions based on an acoustic analogy. Strong scattering at about ±30° from the direction of incident wave propagation is observed. Back scattering is an order of magnitude smaller than forward scattering. For vortices with finite circulation refraction of the sound by the mean flow field outside the vortex core is found to be important in determining the amplitude and directivity of the scattered wave field.

Item Type:Conference or Workshop Item (Paper)
Related URLs:
URLURL TypeDescription Paper Paper
Colonius, Tim0000-0003-0326-3909
Moin, Parviz0000-0002-0491-7065
Additional Information:© 1990 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved. Published Online: 17 Aug 2012. This work was supported by the Office of Naval Research.
Funding AgencyGrant Number
Office of Naval Research (ONR)UNSPECIFIED
Subject Keywords:Aerospace Systems, Operations and Life Cycle
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Other Numbering System NameOther Numbering System ID
AIAA Paper91-0494
Record Number:CaltechAUTHORS:20190726-104730425
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97461
Deposited By: Melissa Ray
Deposited On:01 Aug 2019 16:50
Last Modified:16 Nov 2021 17:31

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