Three-dimensional DNS of sound generated by oblique collision of vortex rings

Yoshitaka Nakashima, Nozomu Hatakeyama, Osamu Inoue

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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 three-dimensional, unsteady, compressible Navier-Stokes equations are solved by a finite difference method over the whole domain from near-vortical field to far-acoustic field. Vortex collision for three initial angles are investigated, and the effects of the collision angle on the vortex motion and characteristic features of the acoustic sound are clarified. In any of the three cases, quadrupolar nature is predominant, but the directivities of the sound pressure are different 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.

Original languageEnglish
Title of host publication13th AIAA/CEAS Aeroacoustics Conference (28th AIAA Aeroacoustics Conference)
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Print)9781624100031
DOIs
Publication statusPublished - 2007
Event13th AIAA/CEAS Aeroacoustics Conference (28th AIAA Aeroacoustics Conference) - Rome, Italy
Duration: 2007 May 212007 May 23

Publication series

Name13th AIAA/CEAS Aeroacoustics Conference (28th AIAA Aeroacoustics Conference)

Other

Other13th AIAA/CEAS Aeroacoustics Conference (28th AIAA Aeroacoustics Conference)
CountryItaly
CityRome
Period07/5/2107/5/23

ASJC Scopus subject areas

  • Aerospace Engineering
  • Mechanical Engineering

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    Nakashima, Y., Hatakeyama, N., & Inoue, O. (2007). Three-dimensional DNS of sound generated by oblique collision of vortex rings. In 13th AIAA/CEAS Aeroacoustics Conference (28th AIAA Aeroacoustics Conference) (13th AIAA/CEAS Aeroacoustics Conference (28th AIAA Aeroacoustics Conference)). American Institute of Aeronautics and Astronautics Inc.. https://doi.org/10.2514/6.2007-3502