Colonius, Tim and Lele, Sanjiva K. and Moin, Parviz (1993) Direct computation of the sound generated by two-dimensional shear layer. In: 15th Aeroacoustics Conference, 25-27 October 1993, Long Beach, CA. https://resolver.caltech.edu/CaltechAUTHORS:20190726-104730351
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Abstract
The sound generated by a two dimensional shear layer is investigated by Direct Numerical Simulation (DNS) of the compressible Navier-Stokes equations. A high-order-accurate numerical scheme and non-reflecting boundary conditions are used to accurately compute both the near field hydrodynamics and the acoustic waves produced by the layer. The directly computed acoustic field shows that the acoustic waves which are generated at the fundamental frequency (most unstable mode), and its first two sub-harmonics, originate near the region where the instability wave at these frequencies saturate, i.e. the region where the layer rolls up into vortices for the fundamental frequency, and the first two Vortex pairings for the sub-harmonics. The sound generated by the pairings is most intense in the downstream direction, indicating a superdirective acoustic source.
| Item Type: | Conference or Workshop Item (Paper) | |||||||||
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| Additional Information: | © 1993 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved. Published Online: 22 Aug 2012. This work was supported by the Office of Naval Research. Computer time was provided by NASA Ames. | |||||||||
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| DOI: | 10.2514/6.1993-4328 | |||||||||
| Record Number: | CaltechAUTHORS:20190726-104730351 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20190726-104730351 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 97460 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Melissa Ray | |||||||||
| Deposited On: | 01 Aug 2019 16:58 | |||||||||
| Last Modified: | 16 Nov 2021 17:31 |
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