Génération de bruit par appariement de tourbillons dans les zones cisaillées

Abstract : Noise generation by vortex pairings in shear flows. Noise generation in a bidimensional subsonic mixing layer is investigated. In order to obtain the acoustic radiation directly from the filtered Navier-Stokes equations, a large eddy simulation code (ALESIA, Appropriate Large Eddy SImulation for Aeroacoustics) is built up using specific numerical techniques of computational aeroacoustics, and especially for boundary conditions. The mixing layer is excited at its fundamental frequency and its first sub-harmonic frequency to fix the location of vortex pairings. The successive pairings generate an acoustic radiation at the frequency of pairings. The sound generation mechanism corresponds to the rotating quadrupole associated to two co-rotative vortices. The dynamics of vortex pairings is also analysed to explain the whole acoustic field. © 2000 Éditions scientifiques et médicales Elsevier SAS large eddy simulation (LES) / computational aeroacoustics (CAA) / mixing layer / vortex pairing / rotating quadrupole
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Christophe Bogey, Christophe Bailly. Génération de bruit par appariement de tourbillons dans les zones cisaillées. Mécanique et Industries, Elsevier, 2000, 1 (5), pp.487-497. ⟨hal-02353101⟩



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