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High-frequency wavepackets in turbulent jets

Sasaki, Kenzo and Cavalieri, André V. G. and Jordan, Peter and Schmidt, Oliver T. and Colonius, Tim and Brès, Guillaume A. (2017) High-frequency wavepackets in turbulent jets. Journal of Fluid Mechanics, 830 . Art. No. R2. ISSN 0022-1120. doi:10.1017/jfm.2017.659.

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Wavepackets obtained as solutions of the flow equations linearised around the mean flow have been shown in recent work to yield good agreement, in terms of amplitude and phase, with those educed from turbulent jets. Compelling agreement has been demonstrated, for the axisymmetric and first helical mode, up to Strouhal numbers close to unity. We here extend the range of validity of wavepacket models to Strouhal number St = 4.0 and azimuthal wavenumber m = 4 by comparing solutions of the parabolised stability equations with a well-validated large-eddy simulation of a Mach 0.9 turbulent jet. The results show that the near-nozzle dynamics can be correctly described by the homogeneous linear model, the initial growth rates being accurately predicted for the entire range of frequencies and azimuthal wavenumbers considered. Similarly to the lower-frequency wavepackets reported prior to this work, the high-frequency linear waves deviate from the data downstream of their stabilisation locations, which move progressively upstream as the frequency increases.

Item Type:Article
Related URLs:
URLURL TypeDescription ItemConference Paper
Sasaki, Kenzo0000-0002-3347-4996
Cavalieri, André V. G.0000-0003-4283-0232
Jordan, Peter0000-0001-8576-5587
Schmidt, Oliver T.0000-0002-7097-0235
Colonius, Tim0000-0003-0326-3909
Brès, Guillaume A.0000-0003-2507-8659
Additional Information:© 2017 Cambridge University Press. Received 5 July 2017; revised 2 September 2017; accepted 11 September 2017. Published online: 29 September 2017. K.S. acknowledges financial support from Capes and FAPESP, grant number 2016/25187-4. A.V.G.C. and P.J. acknowledge support from the Science Without Borders programme (project number A073/2013). A.V.G.C. was supported by a CNPq research scholarship, and by CNPq grant 444796/2014-2. T.C. gratefully acknowledges support from the Office of Naval Research under contract N0014-11-1-0753. The LES studies are supported by the NAVAIR SBIR project, under the supervision of Dr J. T. Spyropoulos. The main calculations were carried out on CRAY XE6 machines at DoD supercomputer facilities at ERDC DSRC.
Funding AgencyGrant Number
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)UNSPECIFIED
Fundação de Amparo à Pesquisa do Estado de Sao Paulo (FAPESP)2016/25187-4
Science Without Borders ProgrammeA073/2013
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)444796/2014-2
Office of Naval Research (ONR)N0014-11-1-0753
Navy Naval Air Systems (NAVAIR)UNSPECIFIED
Subject Keywords:acoustics; aeroacoustics; jet noise
Record Number:CaltechAUTHORS:20171020-092303673
Persistent URL:
Official Citation:Sasaki, K., Cavalieri, A., Jordan, P., Schmidt, O., Colonius, T., & Brès, G. (2017). High-frequency wavepackets in turbulent jets. Journal of Fluid Mechanics, 830. doi:10.1017/jfm.2017.659
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:82537
Deposited By: Tony Diaz
Deposited On:20 Oct 2017 16:39
Last Modified:15 Nov 2021 19:51

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