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- W2064045114 abstract "The theory of aerodynamic sound is reformulated with account taken of the influence of viscosity in the source flow on the sound emission in free space. This is based on the Ffowcs Williams form of the Lighthill equation. The source flow is assumed to be determined by a localized vorticity field and characterized by low Mach numbers and high Reynolds numbers. It is found that the acoustic pressure emitted by the viscous vortex motion is composed of a quadrupole and two kinds of monopole. The Reynolds stress in the source flow is decomposed into isotropic and non-isotropic parts. The non-isotropic part leads to the quadrupole wave derived by Möhring, while the isotropic part is related to one of the monopole-like waves radiated when the total kinetic energy changes. The other monopole wave is associated with entropy production by viscous dissipation of the kinetic energy. All three components are influenced by viscosity." @default.
- W2064045114 created "2016-06-24" @default.
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- W2064045114 date "1984-08-01" @default.
- W2064045114 modified "2023-10-14" @default.
- W2064045114 title "Influence of viscosity on aerodynamic sound emission in free space" @default.
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- W2064045114 doi "https://doi.org/10.1016/0022-460x(84)90674-6" @default.
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