Scattering of Sound by a Vortex Ring

概要

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Following the theory of aerodynamic sound scattering, a general formula of the scattered sound pressure is presented for a case of a plane harmonic wave incident upon a fiow field localized in space. The expression is valid even when the flow is time-dependent and applied to the scattering by a vortex ring in translational motion. The scattering amplitude and cross-section are determined numerically under the condition of slow motion. They depend not only on the incident wavelength, but also on the direction of the vortex motion with respect to the incident wave. The scattering power of the vortex ring is compared with that of a solid sphere of the same size. In the present analysis. no restriction is imposed about the magnitude of the incident wavelength so far as the scattered wave is a small perturbation to the incident one.
社団法人日本物理学会の論文
1981-10-15