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Published May 27, 2016 | Published
Conference Paper Open

High-frequency wavepackets in turbulent jets

Abstract

Wavepackets obtained as solutions of the flow equations linearised around the mean flow have been shown in recent work to yield good agreement with the amplitudes and phases of turbulent fluctuations in jets. Compelling agreement has been demonstrated up to Strouhal numbers, St ≈ 1. We extend the range of validity of wavepacket models to higher values, 1.0 < St < 4.0, by comparing Parabolised Stability Equation solutions with well resolved large-eddy simulation data. The initial growth rates of the high-frequency fluctuations continue to be well predicted, but saturation occurs earlier and agreement with simulation begins to deteriorate upstream of the end of the potential core of the jet. Results show that near-nozzle dynamics for a broad range of frequencies can be modelled using linearised models, which capture well the spatial growth of Kelvin-Helmholtz wavepackets for all the studied Strouhal numbers.

Additional Information

© 2016 by André V. G. Cavalieri. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. Published Online: 27 May 2016. AVGC and PJ acknowledge support from the Science Without Borders program (project number A073/2013). AVGC was supported by a CNPq research scholarship, and by CNPq grant 444796/2014-2. AT and TC gratefully acknowledge support from the Office of Naval Research under contract N0014-11-1-0753. 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

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August 20, 2023
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