Horizontal jets and vortex dipoles in a stratified fluid
Identifieur interne : 001546 ( Main/Exploration ); précédent : 001545; suivant : 001547Horizontal jets and vortex dipoles in a stratified fluid
Auteurs : S. I. Voropayev [Russie] ; Ya. D. Afanasyev [Russie] ; I. A. Filippov [Russie]Source :
- Journal of Fluid Mechanics [ 0022-1120 ] ; 1991-06.
Abstract
When a horizontal force is applied locally to some volume of a viscous densitystratified 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-similar: the lengthscale of the flows increases with time as t ½ for starting jets and as t 1/3 for vortex dipoles. Detailed information about the generation mechanism, kinematics and dynamics of the flows is obtained. On the basis of similarity principles a theoretical explanation of the experimental results is given. The theory is in good agreement with the results obtained.
Url:
DOI: 10.1017/S0022112091000241
Affiliations:
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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-similar: the lengthscale of the flows increases with time as t ½ for starting jets and as t 1/3 for vortex dipoles. Detailed information about the generation mechanism, kinematics and dynamics of the flows is obtained. On the basis of similarity principles a theoretical explanation of the experimental results is given. The theory is in good agreement with the results obtained.</div></front></TEI><affiliations><list><country><li>Russie</li></country><region><li>District fédéral central</li></region><settlement><li>Moscou</li></settlement></list><tree><country name="Russie"><region name="District fédéral central"><name sortKey="Voropayev, S I" sort="Voropayev, S I" uniqKey="Voropayev S" first="S. I." last="Voropayev">S. I. Voropayev</name></region><name sortKey="Afanasyev, Ya D" sort="Afanasyev, Ya D" uniqKey="Afanasyev Y" first="Ya. D." last="Afanasyev">Ya. D. Afanasyev</name><name sortKey="Filippov, I A" sort="Filippov, I A" uniqKey="Filippov I" first="I. A." last="Filippov">I. A. Filippov</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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