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- W2127222783 abstract "Acoustic sound generated by the head-on and oblique collisions of two vortex rings with equal strength is investigated by a direct numerical simulation (DNS). The threedimensional, unsteady, compressible Navier-Stokes equations are solved by a flnite difierence method over the whole domain from near-vortical fleld to far-acoustic fleld. Vortex collision for three initial angles are investigated, and the efiects of the collision angle on the vortex motion and characteristic features of the acoustic sound are clarifled. In any of the three cases, quadrupolar nature is predominant, but the directivities of the sound pressure are difierent among the three collision angles. For the oblique collisions, octupolar component appears in addition to the quadrupolar component, and this octupolar component becomes larger with decreasing collision angle." @default.
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- W2127222783 date "2007-05-21" @default.
- W2127222783 modified "2023-10-05" @default.
- W2127222783 title "Three-Dimensional DNS of Sound Generated by Oblique Collision of Vortex Rings" @default.
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- W2127222783 doi "https://doi.org/10.2514/6.2007-3502" @default.
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