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- W2012309054 abstract "Abstract The generation of discrete acoustic tones in the compressible flow around an aerofoil is addressed in this work by means of nonlinear numerical simulations and global stability analyses. The nonlinear simulations confirm the appearance of discrete tones in the acoustic spectrum and, for the chosen flow case, the global stability analyses of the mean-flow dynamics reveal that the linearized operator is stable. However, the flow response to incoming disturbances exhibits important transient growth effects that culminate in the onset of aeroacoustic feedback loops, involving instability processes on the suction- and pressure-surface boundary layers together with their cross-interaction by acoustic radiation at the trailing edge. The features of the aeroacoustic feedback loops and the appearance of discrete tones are then related to the features of the least-stable modes in the global spectrum: the spatial structure of the direct modes displays the coupled dynamics of hydrodynamic instabilities on the suction surface and in the near wake. Finally, different families of global modes will be identified and the dynamics that they represent will be discussed." @default.
- W2012309054 created "2016-06-24" @default.
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- W2012309054 date "2014-07-30" @default.
- W2012309054 modified "2023-09-25" @default.
- W2012309054 title "A global analysis of tonal noise in flows around aerofoils" @default.
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- W2012309054 doi "https://doi.org/10.1017/jfm.2014.356" @default.
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