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Communication Dans Un Congrès Année : 2012

Aeroacoustics: convergence between direct computations and experiments

Résumé

Recent evolutions of numerical methods and of experimental techniques used for the characterization of sound generated by flows will be reviewed. In the flow region it is now possible to obtain a rather complete view of the time-evolution of turbulent structures using Time Resolved Particle Image Velocimetry; this type of information is very similar to what can be computed by Large Eddy Simulations. In that sense there is a convergence between experimental and numerical approaches and common post-processing tools can be used to obtain some information on the physics of flow noise. However each approach has its own strengths and deficiencies; for example numerical simulations are limited to relatively low Reynolds numbers and conclusions drawn in these conditions are sometimes dangerous to extrapolate to real -high Reynolds number- configurations. On the other hand experimental data in the acoustic field are relatively sparse due to the small number of sensors available whereas complete information is easily obtained from numerical simulations. The combined used of time-resolved experimental and numerical data on the same configurations is therefore an avenue for progressing toward the understanding of noise generation process and the development of noise reduction strategies.
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hal-00811380 , version 1 (23-04-2012)

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  • HAL Id : hal-00811380 , version 1

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Daniel Juvé. Aeroacoustics: convergence between direct computations and experiments. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00811380⟩
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