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The formation of toroidal bubbles upon the collapse of transient cavities

Published online by Cambridge University Press:  26 April 2006

J. P. Best
J. P. Best
Affiliation:
Materials Research Laboratory (MRL) - DSTO, PO Box 50, Ascot Vale, Victoria, 3032, Australia
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Abstract

A spectacular feature of transient cavity collapse in the neighbourhood of a rigid boundary is the formation of a high-speed liquid jet that threads the bubble and ultimately impacts upon the side of the bubble nearest to the boundary. The bubble then evolves into some toroidal form, the flow domain being doubly connected. In this work, the motion of the toroidal bubble is computed by connecting the jet tip to the side of the bubble upon which it impacts. This connection is via a cut introduced into the flow domain and across which the potential is discontinuous, the value of this discontinuity being equal to the circulation in the flow. A boundary integral algorithm is developed to account for this geometry and some example computations are presented. Consideration of the pressure field in the fluid has implications for possible damage mechanisms to structures due to nearby cavity collapse.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 251 , June 1993 , pp. 79 - 107
Copyright
© 1993 Cambridge University Press

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