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Computation of Sound Generation and Flow/Acoustic Instabilities in the Flow Past an Open Cavity

Colonius, Tim and Basu, Amit J. and Rowley, Clarence W. (1999) Computation of Sound Generation and Flow/Acoustic Instabilities in the Flow Past an Open Cavity. In: Proceedings of FEDSM99. American Society of Mechanical Engineers , New York, NY. ISBN 9780791819616.

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The modes of oscillation and radiated acoustic fields of compressible flows over open cavities are investigated computationally. The compressible Navier-Stokes equations are solved directly (no turbulence model) for two dimensional open cavities with laminar boundary layers upstream. The computational domain is large enough to directly resolve a portion of the radiated acoustic field. The results show a bifurcation from a shear layer mode, for shorter cavities and lower Mach numbers, to a wake mode for longer cavities and higher Mach numbers. The shear layer mode is well characterized by Rossiter modes and these oscillations lead to intense upstream acoustic radiation dominated by a single frequency. The wake mode is characterized instead by a large-scale vortex shedding with Strouhal number nearly independent the Mach number. The vortex shedding causes the boundary layer to periodically separate upstream of the cavity. Acoustic radiation is more intense, with multiple frequencies present. The wake mode oscillation is similar to that reported by Gharib & Roshko (1987) for incompressible cavity flows with laminar upstream boundary layers.

Item Type:Book Section
Colonius, Tim0000-0003-0326-3909
Rowley, Clarence W.0000-0002-9099-5739
Additional Information:© 1999 by ASME. The authors gratefully acknowledges the support of the National Science Foundation under grant CTS-9501349 and the Air Force Office of Scientific Research under grant F49620-98-1-0095.
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Air Force Office of Scientific Research (AFOSR)F49620-98-1-0095
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Record Number:CaltechAUTHORS:20190726-104730500
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97462
Deposited By: Melissa Ray
Deposited On:01 Aug 2019 17:02
Last Modified:03 Oct 2019 21:31

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