title: Sound scattering by a vortex dipole.
abstract: Sound scattering by a system of two counter-rotating vortices (Lamb dipole) is considered, using the effective approach of Pitaevskii [J. Exp. Theor. Phys (USSR) 35, 1271-1275 (1958); Sov. Phys. JETP 85, 888-890 (1959)], based on application of the asymptotic representation of the scattering Green function, the Dirac delta function modeling of the vortex, and the Fourier transformation of the vector of scattering. The sound frequency is supposed to be low. The directivity pattern of the radiation, scattered by the Lamb dipole is obtained. There is no singularity in scattering field in this case as it must be for the vorticity with zero circulation, so the dipole is a more appropriate object for the approximation used.
authors.affiliation: Zel Technologies, LLC, Boulder, Colorado 80305, USA. konstantin.naugolnykh@noaa.gov
authors.forename: Konstantin
authors.initials: K
authors.lastname: Naugolnykh
mesh_terms: D000162:Acoustics; D005583:Fourier Analysis; D008962:Models, Theoretical; D009038:Motion; D011312:Pressure; D012542:Scattering, Radiation; D013016:Sound; D013997:Time Factors