Vortex sound generation due to a flow impedance discontinuity on a flat surface

Shiu Keung Tang, K. M. Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)


The sound generated by the unsteady motion of a vortex filament moving over a flat boundary with a sharp flow impedance discontinuity is studied theoretically. Theoretical results show that the vortex filament undergoes significant accelerating or decelerating motions and radiates sound at the instant when it moves across the plane of impedance discontinuity. The accelerations and decelerations of the vortex filament are shown to be the major mechanisms of sound generation. The sound so produced has a large low-frequency content such that the change in the flow impedance affects only the sound generation process but not the subsequent sound propagation to the far field.
Original languageEnglish
Pages (from-to)1334-1341
Number of pages8
JournalJournal of the Acoustical Society of America
Issue number4
Publication statusPublished - 18 Apr 2001

ASJC Scopus subject areas

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics


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