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Vortex ring bubbles

Published online by Cambridge University Press:  26 April 2006

T. S. Lundgren  and
N. N. Mansour
T. S. Lundgren
Affiliation:
Department of Aerospace Engineering and Mechanics, University of Minnesota, Minneapolis, MN 55455, USA
N. N. Mansour
Affiliation:
NASA Ames Research Center, Moffett Field, CA 94035, USA
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Abstract

Toroidal bubbles with circulation are studied numerically and by means of a physically motivated model equation. Two series of computations are performed by a boundary-integral method. One set shows the starting motion of an initially spherical bubble as a gravitationally driven liquid jet penetrates through the bubble from below causing a toroidal geometry to develop. The jet becomes broader as surface tension increases and fails to penetrate if surface tension is too large. The dimensionless circulation that develops is not very dependent on the surface tension. The second series of computations starts from a toroidal geometry, with circulation determined from the earlier series, and follows the motion of the rising and spreading vortex ring. Some modifications to the boundary-integral formulation were devised to handle the multiply connected geometry. The computations uncovered some unexpected rapid oscillations of the ring radius. These oscillations and the spreading of the ring are explained by the model equation which provides a more general description of vortex ring bubbles than previously available.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 224 , March 1991 , pp. 177 - 196
Copyright
© 1991 Cambridge University Press

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