Acoustic wave emitted by a vortex ring passing near the edge of a half-plane
- 1 June 1985
- journal article
- research article
- Published by Cambridge University Press (CUP) in Journal of Fluid Mechanics
- Vol. 155, 77-103
- https://doi.org/10.1017/s0022112085001720
Abstract
Acoustic emission by vortex–edge interaction is investigated both theoretically and experimentally. The theory of vortex sound enables us to represent the far-field pressure in terms of the vortex motion near the half-plane edge. It is found that the pressure p depends on the product of an angular factor representing directionality and a time factor representing wave profile. The pressure formula leads to the scaling law time derivative of the volume flux (through the vortex ring) of a hypothetical potential flow around the edge.Keywords
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