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J . Fluid Mech. (1992),vol. 236,pp. 66.M89 Printed in Great Britain
 

Summary: J . Fluid Mech. (1992),vol. 236,pp. 66.M89
Printed in Great Britain
665
Two-dimensional vortex-dipole interactions in a
stratified fluid
By S. I. VOROPAYEV AND YA.D. AFANASYEV
Institute of Oceanology,USSR Academy of Sciences, Krasikova 23, Moscow 117218, USSR
(Received 13 July 1990 and in revised form 16 September 1991)
Planar motion produced when a viscous fluid is forced from an initial state of rest is
studied. We consider a vortex dipole produced by the action of a point force
(Cantwell 1986),and a vortex quadrupole produced by the action of two equal forces
of opposite direction. We also present results from an experimental investigation into
thc dynamics of the interactions between vortex dipoles as well as between vortex
dipoles and a vertical wall in a stratified fluid. Theoretical consideration reveals that
the dynamics of two-dimensional vortex-dipole interactions are determined by two
main governing parameters : the dipolar intensity of the vorticity distribution
(momentum) and the quadrupolar intensity of the vorticity distribution of the flow.
Wc document details of different basic types of interactions and present a physical
interpretation of the results obtained in terms of vortex multipoles : dipoles,
quadrupoles and their combinations.

  

Source: Afanassiev, Iakov - Department of Physics and Physical Oceanography, Memorial University of Newfoundland

 

Collections: Geosciences