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Three-Dimensional Linear Stability Analysis of Cavity Flows

Brès, Guillaume A. and Colonius, Tim (2007) Three-Dimensional Linear Stability Analysis of Cavity Flows. In: 45th AIAA Aerospace Sciences Meeting and Exhibit, 8-11 January 2007, Reno, NV.

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Numerical Simulations of the two- and three-dimensional linearized Navier–Stokes equations are performed to investigate instabilities of open cavity flows that are homogeneous in the spanwise direction. First, the onset of two-dimensional cavity instability is characterized over a range of Mach numbers, Reynolds numbers and cavity aspect ratios. The resulting oscillations are consistent with the typical Rossiter flow/acoustic resonant modes. We then identify the presence of three-dimensional instabilities of the two-dimensional basic flow and study their dependence on the parameter space. In general, the most amplified three-dimensional mode has a spanwise wavelength scaling with the cavity depth, and a frequency typically an order-of-magnitude smaller than two-dimensional Rossiter modes. The instability appears to arise from a generic centrifugal instability mechanism associated with a large vortex in the two-dimensional basic flow that occupies the downstream portion within the cavity.

Item Type:Conference or Workshop Item (Paper)
Related URLs:
URLURL TypeDescription Paper Paper
Brès, Guillaume A.0000-0003-2507-8659
Colonius, Tim0000-0003-0326-3909
Additional Information:© 2007 by G.A. Brès & T. Colonius. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. Published Online: 18 Jun 2012. This work was supported by AFOSR under grant F49620-02-1-0362. Computer time was provided in part by the Department of Defense High Performance Computing Centers. Part of this work was done in collaboration with Pr. V. Theofilis from the School of Aeronautics, Universidad Politecnica de Madrid.
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Air Force Office of Scientific Research (AFOSR)F49620-02-1-0362
Subject Keywords:Aerospace Systems, Operations and Life Cycle
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AIAA Paper2007-1126
Record Number:CaltechAUTHORS:20190718-165126320
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97260
Deposited By: Melissa Ray
Deposited On:23 Jul 2019 22:23
Last Modified:16 Nov 2021 17:30

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