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Physics of Fluids / Volume 15 / Issue 3 / ARTICLES

Phys. Fluids 15, 618 (2003); http://dx.doi.org/10.1063/1.1539475 (7 pages)

Vortex streets generated by a moving momentum source in a stratified fluid

S. I. Voropayev1,2 and S. A. Smirnov1

1Department of Mechanical and Aerospace Engineering, Arizona State University, Tempe, Arizona 85287-9809
2Institute of Oceanology, Russian Academy of Sciences, Moscow, 117851, Russia

(Received 17 April 2002; accepted 18 November 2002; published online 22 January 2003)

The aim of this paper is to present the results of experiments conducted in a stratified fluid with a momentum source modeled by a moving jet in the asymptotic case when the size of the source is negligibly small but the resulting force (momentum flux), which acts on the fluid, remains finite. In this case the forcing may be considered as a “point” force moving in the fluid and the problem has no obvious characteristic length scale, compared to the case of a bluff body. The latter, towed horizontally in the stratified fluid, frequently leaves behind a highly organized vortex street, the characteristics of which strongly depend on the body diameter. It is shown that a similar type of the vortex streets may be generated by a “point” momentum source and conditions when this occurs are found. Experimental data on the characteristics of the vortex streets are presented and compared with the towed body case. © 2003 American Institute of Physics.

© 2003 American Institute of Physics

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KEYWORDS and PACS

Keywords

vortices, stratified flow, jets

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.1539475

PUBLICATION DATA

ISSN

1070-6631 (print)  
1089-7666 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    S. I. Voropayev, G. B. McEachern, H. J. S. Fernando, and D. L. Boyer, "Large vortex structures behind a maneuvering body in stratified fluids," Phys. Fluids 11, 1682 (1999)PHFLE6000011000006001682000001.

    H-P. Pao and T. W. Kao, "Vortex structure in a wake of a sphere," Phys. Fluids 20, 187 (1977)PFLDAS000020000002000187000001.

    J. M. Chomaz, P. Bonneton, A. Butet, and E. J. Hopfinger, "Vertical diffusion of the far wake of a sphere moving in a stratified fluid," Phys. Fluids A 5, 2799 (1993)PFADEB000005000011002799000001.

    G. R. Spedding, "Anisotropy in turbulence profiles of stratified wakes," Phys. Fluids 13, 2361 (2001)PHFLE6000013000008002361000001.

    M. G. Gourlay, S. C. Arendt, D. C. Fritts, and J. Werne, "Numerical modeling of initially turbulent wakes with net momentum," Phys. Fluids 13, 3783 (2001)PHFLE6000013000012003783000001.

    H. Johan and H. Fang, "Horizontal vortex ring motion in linearly stratified media," Phys. Fluids 9, 2605 (1997)PHFLE6000009000009002605000001.

    J. B. Flor, G. J. F. van Heijst, and R. Delfos, "Decay of dipolar vortex structures in a stratified fluid," Phys. Fluids 7, 374 (1995)PHFLE6000007000002000374000001.


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