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Super- and multi-directive acoustic radiation by linear global modes of a turbulent jet

Schmidt, Oliver T. and Towne, Aaron and Colonius, Tim and Jordan, Peter and Jaunet, Vincent and Cavalieri, André V. G. and Brès, Guillaume A. (2016) Super- and multi-directive acoustic radiation by linear global modes of a turbulent jet. In: 22nd AIAA/CEAS Aeroacoustics Conference, 30 May-1 June 2016, Lyon, France.

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The mean flow stability of a Mach 0.9 turbulent jet is investigated by means of global linear theory with a focus on acoustic effects. A novel class of resonant acoustic modes that are trapped within the potential core, and whose eigenvalues appear as discrete branches in the global stability spectrum, is studied in detail. A dispersion relation is reconstructed from the global modes, and shown to accurately predict energy bands observed in the PSD of a high-fidelity LES. Similarly, the acoustic far-field radiation patterns of the trapped modes are compared to the LES. A favorable agreement between the global mode waveforms and coherent structures educed from the LES is found for both the trapped acoustic wave component inside the core and the far-field radiation.

Item Type:Conference or Workshop Item (Paper)
Related URLs:
URLURL TypeDescription Paper Paper
Schmidt, Oliver T.0000-0002-7097-0235
Towne, Aaron0000-0002-7315-5375
Colonius, Tim0000-0003-0326-3909
Jordan, Peter0000-0001-8576-5587
Cavalieri, André V. G.0000-0003-4283-0232
Brès, Guillaume A.0000-0003-2507-8659
Additional Information:© 2016 by Oliver T. Schmidt. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. Published Online: 27 May 2016. OTS gratefully acknowledges support by DFG grant no. 3114/1-1. AT and TC gratefully acknowledge support from the Office of Naval Research under contract N0014-11-1-0753. AVGC and PJ acknowledge support from the Science Without Borders program (project number A073/2013). The LES study was supported by NAVAIR SBIR project, under the supervision of Dr. John T. Spyropoulos. The main LES calculations were carried out on CRAY XE6 machines at DoD HPC facilities in ERDC DSRC.
Funding AgencyGrant Number
Deutsche Forschungsgemeinschaft (DFG)3114/1-1
Office of Naval Research (ONR)N0014-11-1-0753
Science Without BordersA073/2013
Naval Air Systems Command (NAVAIR)UNSPECIFIED
Other Numbering System:
Other Numbering System NameOther Numbering System ID
AIAA Paper2016-2808
Record Number:CaltechAUTHORS:20190709-092100617
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96969
Deposited By: Melissa Ray
Deposited On:11 Jul 2019 16:50
Last Modified:16 Nov 2021 17:25

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