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Numerical investigation of the flow past a cavity

Colonius, Tim and Basu, Amit J. and Rowley, Clarence W. (1999) Numerical investigation of the flow past a cavity. In: 5th AIAA/CEAS Aeroacoustics Conference and Exhibit, 10-12 May 1999, Bellevue, WA.

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Numerical simulations are used to investigate the resonant instabilities in the flow past an open cavity. The compressible Navier-Stokes equations are solved directly (no turbulence model) for two-dimensional 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 transition 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. The wake mode is characterized instead by a large-scale vortex shedding with Strouhal number independent of the Mach number. The vortex shedding causes the boundary layer to periodically separate upstream of the cavity. The wake mode oscillation is similar to that reported by Gharib and Roshko (J. Fluid Mech., 177, 1987) for incompressible ow with a laminar upstream boundary layer. The results suggest that laminar separation upstream of the cavity edge is the cause of the transition to wake mode.

Item Type:Conference or Workshop Item (Paper)
Related URLs:
URLURL TypeDescription Paper Paper
Colonius, Tim0000-0003-0326-3909
Rowley, Clarence W.0000-0002-9099-5739
Additional Information:© 1999 by the authors. Published by the American Institute of Aeronautics and Astronautics, Inc. with permission. Published Online: 22 Aug 2012. This research was supported by AFOSR under grant F49620-98-1-0095 with technical monitor Dr. Thomas Beutner. Supercomputer time was provided by the Department of Defense High Performance Computing centers, as well as the National Science Foundation. C.W. Rowley acknowledges the support of a National Science Foundation Graduate Fellowship.
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)F49620-98-1-0095
NSF Graduate Research FellowshipUNSPECIFIED
Subject Keywords:Aeroacoustics
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Other Numbering System NameOther Numbering System ID
AIAA Paper99-1912
Record Number:CaltechAUTHORS:20190726-104730595
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97463
Deposited By: Melissa Ray
Deposited On:01 Aug 2019 18:11
Last Modified:16 Nov 2021 17:31

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