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Direct Numerical Simulations of Three-Dimensional Cavity Flows

Brès, Guillaume A. and Colonius, Tim (2007) Direct Numerical Simulations of Three-Dimensional Cavity Flows. In: 13th AIAA/CEAS Aeroacoustics Conference (28th AIAA Aeroacoustics Conference), 21-23 May 2007, Rome, Italy. https://resolver.caltech.edu/CaltechAUTHORS:20190718-165126239

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Abstract

Three-dimensional direct numerical simulations of the full compressible Navier–Stokes equations are performed for cavities that are homogeneous in the spanwise direction. The formation of oscillating spanwise structures is observed inside the cavity. We show that this 3D instability arises from a generic centrifugal instability mechanism associated with the mean recirculating vortical flow in the downstream part of the cavity. In general, the three-dimensional mode has a spanwise wavelength of approximately 1 cavity depth and oscillates with a frequency about an order-of-magnitude lower than 2D Rossiter (flow/acoustics) instabilities. The 3D mode properties are in excellent agreement with predictions from our previous linear stability analysis. When present, the shear-layer (Rossiter) oscillations experience a low-frequency modulation that arises from nonlinear interactions with the three-dimensional mode. We connect these results with the observation of low-frequency modulations and spanwise structures in previous experimental and numerical studies on open cavity flows. Preliminary results on the connections between the 3D centrifugal instabilities and the presence/suppression of the wake mode are also presented.


Item Type:Conference or Workshop Item (Paper)
Related URLs:
URLURL TypeDescription
https://doi.org/10.2514/6.2007-3405DOIConference Paper
https://arc.aiaa.org/doi/10.2514/6.2007-3405PublisherConference Paper
ORCID:
AuthorORCID
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: 4 Nov 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.
Funders:
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)F49620-02-1-0362
Subject Keywords:Aeroacoustics
Other Numbering System:
Other Numbering System NameOther Numbering System ID
AIAA Paper2007-3405
Record Number:CaltechAUTHORS:20190718-165126239
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190718-165126239
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97259
Collection:CaltechAUTHORS
Deposited By: Melissa Ray
Deposited On:23 Jul 2019 22:24
Last Modified:03 Oct 2019 21:29

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