The role of viscosity in aerodynamic sound generation
The role of viscosity in aerodynamic sound generation
The interpretation of unsteady surface shear stresses as dipole sound sources is discussed. Provided omega nu c2 <<1, it is legitimate to calculate the radiated pressure using viscous surface dipoles in combination with an inviscid-medium Green function. This is demonstrated via comparisons of acoustic-analogy predictions with exact solutions, for two plane-boundary problems. A Green function that is tailored to the linear relation between pressure and normal velocity on the boundary, as used by Powell [J. Acoust. Soc. Am. Vol. 32, 1960, pp. 982-990], highlights the role of viscous stresses in aeroacoustic calculations.
225-240
Morfey, C.L.
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1 July 2003
Morfey, C.L.
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Morfey, C.L.
(2003)
The role of viscosity in aerodynamic sound generation.
International Journal of Aeroacoustics, 2 (3-4), .
Abstract
The interpretation of unsteady surface shear stresses as dipole sound sources is discussed. Provided omega nu c2 <<1, it is legitimate to calculate the radiated pressure using viscous surface dipoles in combination with an inviscid-medium Green function. This is demonstrated via comparisons of acoustic-analogy predictions with exact solutions, for two plane-boundary problems. A Green function that is tailored to the linear relation between pressure and normal velocity on the boundary, as used by Powell [J. Acoust. Soc. Am. Vol. 32, 1960, pp. 982-990], highlights the role of viscous stresses in aeroacoustic calculations.
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Published date: 1 July 2003
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Local EPrints ID: 10374
URI: http://eprints.soton.ac.uk/id/eprint/10374
ISSN: 1475-472X
PURE UUID: 1e6245de-ff8d-4aa3-b326-2db4d2745eb1
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Date deposited: 30 Jun 2005
Last modified: 15 Mar 2024 04:59
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C.L. Morfey
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