Rodríguez, Daniel and Sinha, Aniruddha and Brès, Guillaume A. and Colonius, Tim (2013) Acoustic field associated with parabolized stability equation models in turbulent jets. In: 19th AIAA/CEAS Aeroacoustics Conference, 27-29 May 2013, Berlin, Germany. https://resolver.caltech.edu/CaltechAUTHORS:20190712-112323164
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Abstract
Wavepackets are large-scale turbulent structures that are correlated and advected over distances that are large compared to the integral scales of turbulence, and have been shown to be responsible for the peak noise radiated at aft angles to the jet axis. The present paper discusses linear models of these wavepackets for supersonic turbulent jets based on Parabolized Stability Equations (PSE). In the past, results of this approach were shown to be in excellent agreement with coherent structures extracted from experimental near-field pressure and velocity data in subsonic jets. Here, we make use of a Large Eddy Simulation (LES) database for an isothermal and a moderately heated Mach 1.5 turbulent jets. Careful comparisons of the PSE models with near-field pressure fields from LES, filtered by means of Proper Orthogonal Decomposition (POD), demonstrate acceptable fidelity of the model. Finally, the acoustic far-field associated with the PSE wavepackets is computed using a Kirchhoff surface method, capturing reasonably well the far-field pressure at angles close to the peak.
| Item Type: | Conference or Workshop Item (Paper) | |||||||||
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| Additional Information: | © 2013 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved. Published Online: 24 May 2013. This work was sponsored in part by the U.S. Navy Naval Air Systems Command (Contract N68335-11-C0026) and by the Office of Naval Research (Grant N0014-11-1-0753). Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the sponsoring agencies. The LES calculations were carried out on CRAY XE6 machines at DoD supercomputer facilities in ERDC and AFRL. D. Rodríguez acknowledges funding from the Marie Curie - COFUND-UNITE programme. | |||||||||
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| Subject Keywords: | Aeroacoustics | |||||||||
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| DOI: | 10.2514/6.2013-2279 | |||||||||
| Record Number: | CaltechAUTHORS:20190712-112323164 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20190712-112323164 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 97124 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Melissa Ray | |||||||||
| Deposited On: | 15 Jul 2019 20:49 | |||||||||
| Last Modified: | 16 Nov 2021 17:26 |
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