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• W2740990109 abstract "The FW-H equations allow to extrapolate acoustic fluctuations outside of a particular surface. In many applications, such as jet noise or turbomachinary noise, parts of the surface may lie in regions of high vorticity. Vorticity crossing the surface generates spurious noise sources in the thickness and loading terms. These sources are cancelled out by the quadrupole sources outside of the surface. Unfortunately, these quadrupole sources are usually neglected which leads to incorrect noise predictions. A generalized form of the FW-H formulation was recently developed to overcome this problem. It relies on a distributed extrapolation zone, instead of a single surface. This paper applies this new theory to the simplified problem of a divergence-free Gaussian vortex crossing a spherical FW-H surface. It is shown that the two key parameters driving the accuracy of the noise prediction are the distance between two outflow surfaces, which should be bigger than the characteristic length of the vortex, and the thickness of the outflow region, which should be small compared to the acoustic wavelength. Reductions in the sound pressure level of the spurious noise of up to 13 dB are obtained using 4 surfaces." @default.
• W2740990109 created "2017-08-08" @default.
• W2740990109 creator A5021829090 @default.
• W2740990109 creator A5043181237 @default.
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• W2740990109 date "2015-01-01" @default.
• W2740990109 modified "2023-09-23" @default.
• W2740990109 title "A GENERALISED FFOWCS-WILLIAMS AND HAWKINGS FOR- MULATION APPLIED TO FLOW SIMULATIONS WITH VORTI- CAL OUTFLOW" @default.
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• W2740990109 hasPublicationYear "2015" @default.
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