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Large eddy simulation for jet noise: azimuthal decomposition and intermittency of the radiated sound

Brès, Guillaume A. and Jaunet, Vincent and Le Rallic, Maxime and Jordan, Peter and Towne, Aaron and Schmidt, Oliver T. and Colonius, Tim and Cavalieri, André V. G. and Lele, Sanjiva K. (2016) Large eddy simulation for jet noise: azimuthal decomposition and intermittency of the radiated sound. In: 22nd AIAA/CEAS Aeroacoustics Conference, 30 May-1 June 2016, Lyon, France. https://resolver.caltech.edu/CaltechAUTHORS:20190712-112321549

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Abstract

To improve understanding and modeling of jet-noise source mechanisms, extensive experimental and numerical databases are generated for an isothermal Mach 0.9 turbulent jet at Reynolds number Re = 10^6. The large eddy simulations (LES) feature localized adaptive mesh refinement, synthetic turbulence and wall modeling inside the nozzle to match the fully turbulent nozzle-exit boundary layers in the experiments. Long LES databases are collected for two grids with different mesh resolutions in the jet plume. Comparisons with the experimental measurements show good agreement for the flow and sound predictions, with the far-field noise spectra matching microphone data to within 0.5 dB for most relevant angles and frequencies. Preliminary results on the radiated noise azimuthal decomposition and temporal intermittency are also discussed. The azimuthal analysis shows that the axisymmetric mode is dominant at the peak radiation angles and that the first 3 Fourier azimuthal modes of the LES data recover more than 97% of the total acoustic energy at these angles. The temporal analysis highlights the presence of recurring intermittency in the radiated sound for the low-frequency range and main downstream angles. At these frequencies and angles, temporally-localized bursts of noise can reach levels up to 3 or 4 dB higher (or lower) than the long-time average.


Item Type:Conference or Workshop Item (Paper)
Related URLs:
URLURL TypeDescription
https://doi.org/10.2514/6.2016-3050DOIConference Paper
https://arc.aiaa.org/doi/10.2514/6.2016-3050PublisherConference Paper
ORCID:
AuthorORCID
Brès, Guillaume A.0000-0003-2507-8659
Jordan, Peter0000-0001-8576-5587
Towne, Aaron0000-0002-7315-5375
Schmidt, Oliver T.0000-0002-7097-0235
Colonius, Tim0000-0003-0326-3909
Cavalieri, André V. G.0000-0003-4283-0232
Additional Information:© 2016 by the authors. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. Published Online: 27 May 2016. The LES studies are supported by NAVAIR SBIR project, under the supervision of Dr. John T. Spyropoulos. The main calculations were carried out on CRAY XE6 machines at DoD supercomputer facilities in ERDC DSRC. P. Jordan acknowledges the support of the French National Research Agency (ANR) through the project COOLJAZZ.
Funders:
Funding AgencyGrant Number
Naval Air Systems Command (NAVAIR)UNSPECIFIED
Agence Nationale pour la Recherche (ANR)COOLJAZZ
Other Numbering System:
Other Numbering System NameOther Numbering System ID
AIAA Paper2016-3050
Record Number:CaltechAUTHORS:20190712-112321549
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190712-112321549
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97110
Collection:CaltechAUTHORS
Deposited By: Melissa Ray
Deposited On:15 Jul 2019 18:08
Last Modified:09 Mar 2020 13:18

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