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Article Dans Une Revue International Journal of Numerical Methods for Heat and Fluid Flow Année : 2016

Modal analysis of jet near-field pressure fluctuation

Résumé

Purpose – Unstable Kelvin-Helmholtz waves are suspected to be responsible for a large part of lowfrequency noise radiation in high-speed jets. The purpose of this paper is to check the coherence of numerical and experimental data concerning this phenomenon, in the particular case of a cold subsonic jet. Design/methodology/approach – In the present work, a cross-investigation of the near pressure field is performed on three different data sets: large-eddy simulation (LES) computations, parabolised stability equations (PSE) semi-modal computations and microphone measurements, in order to determine the local amplitudes of unstable waves. Findings – The large coherent structures are found in both LES and experimental results and they are also in good agreement with direct semi-modal computations carried out with the PSE approach. Originality/value – This work confirms that the unstable wave packets can be extracted from both LES and experimental results, provided that an appropriate modal decomposition is performed.

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Dates et versions

hal-01398072 , version 1 (16-11-2016)

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Jean-Philippe Brazier, Maxime Huet, Olivier Léon, Maxime Itasse. Modal analysis of jet near-field pressure fluctuation. International Journal of Numerical Methods for Heat and Fluid Flow, 2016, 26 (7), p. 2000-2012. ⟨10.1108/HFF-07-2015-0289⟩. ⟨hal-01398072⟩
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