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J . Fluid Mech. (1991), vol. 227, p p . 543-566 Printed in Great Britain
 

Summary: J . Fluid Mech. (1991), vol. 227, p p . 543-566
Printed in Great Britain
543
Horizontaljets and vortex dipoles in a
stratified fluid
By S. I. VOROPAYEV, YA. D. AFANASYEV
AND I. A. FILIPPOV
Institute of Oceanology, USSR Academy of Sciences, Krasikova 23, Moscow 117218, USSR
(Received 23 August 1988 and in revised form 4 December 1990)
When a horizontal force is applied locally to some volume of a viscous density-
stratified fluid, flows with high concentration of vertically oriented vorticity (vortex
dipoles) are generated. The processes of generation and evolution with time of these
unsteady flows in a stratified fluid are studied. A convenient way to produce and
study these flows in the laboratory is to use a submerged horizontal jet as a `point'
source of momentum. The main governing parameter (the `force')is easily controlled
in this case. Two regimes were studied : starting jets with dipolar vortex fronts (the
force acts continuously) and impulsive vortex dipoles (the force acts for a short
period of time). A conductivity microprobe, aluminium powder, shadowgraph,
thymol-blue and other techniques have been used to measure the velocity and
density distributions in the flows. It is found that in both regimes the flows are self-

  

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

 

Collections: Geosciences