Results 191 to 200 of about 16,312 (221)

On the origin of the secondary vortex street

Journal of Fluid Mechanics, 2012
AbstractThe origin of the secondary vortex street, observed in the far wake in the flow past a circular cylinder, is investigated. The Reynolds number, based on the diameter of the cylinder, is 150. The von Kármán vortex street, which originates in the near wake, decays exponentially downstream of the cylinder.
Kumar, Bhaskar, Mittal, Sanjay
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Kármán Vortex Streets

1960
Publisher Summary The phenomenon of periodic vortex shedding from a symmetrical bluff body and the formation of the vortices in a street have been the concern of experimenters and theoreticians for 50 years. Meanwhile, new contributions have added further facets to our subject matter, and some of the older work has achieved new importance ...
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Heliospheric Vortex Street

1995
Abstract One of the most surprising results from the plasma experiment on Voyager 2 is the discovery of a quasi-periodic meridional flow with a period of about 25.5 days between 20 AU and 25 AU from 1986 to early 1988 (Lazarus and Belcher, 1988; Lazarus et al., 1988; Lazarus and McNutt, 1990).
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Dusty drift vortex streets

Physica Scripta, 1995
It is shown that the nonlinear equations governing the dynamics of dust drift waves admit stationary solutions in the form of dusty drift vortex chains.
J T Mendonça, P K Shukla
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On cell formation in vortex streets

Journal of Fluid Mechanics, 1991
A simple, phenomenological model is proposed for the formation of spanwise cells behind slender bodies of revolution in crosswise, uniform or non-uniform oncoming flow. The model yields estimates for the position of the cells, their frequencies, their amplitudes of oscillation along the span, and the local shedding angle.
Bernd R. Noack, Frank Ohle, Helmut Eckelmann   +2 more
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A criterion for vortex street breakdown

Physics of Fluids A: Fluid Dynamics, 1991
A new theoretical development for vortex street wakes, which includes viscous dissipation, is used to derive an analytical criterion for breakdown of the street. The analysis shows that beyond a certain critical distance downstream of the wake-generating cylinder, a perturbation in wavelength will rapidly grow, destroying the periodicity of the vortex ...
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Stability of a Quadruple Vortex Street

Journal of the Physical Society of Japan, 1981
The stability of a quadruple vortex street, i.e. a pair of double vortex streets in a perfect fluid is investigated for small disturbances. Permanent configurations are first determined; two of which are then examined in their stability–one is a symmetric arrangement of a pair of staggered (Karman-type) double streets and the other is an antisymmetric ...
Kyoji Yamamoto, Kenji Watanabe, Shinichiro Yanase   +2 more
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Energy separation in a vortex street

Journal of Fluid Mechanics, 1987
When a bluff body is placed in a crossflow, the total temperature in its wake can become substantially less than the incoming one, as manifested by the fact that the recovery factorRon its rearmost surface takes negative values at high subsonic flow: this is the phenomenon referred to here as the Eckert-Weise effect. Although a vortex street has been a
M. Kurosaka, J. B. Gertz, J. E. Graham, J. R. Goodman, P. Sundaram, W. C. Riner, H. Kuroda, W. L. Hankey   +7 more
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Cooled Vortex Street Characteristics

Numerical Heat Transfer, Part A: Applications, 2010
Common and different characteristics among the cooled vortex street, cooled Karman vortex street, and isothermal wavy wake in the cooled laminar wake above the isothermal or cooled circular cylinder exposing in the upward mainstream of mercury, air, or water at the Reynolds number Re = 44 are discussed. Employing the previous and new distributions, the
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DNS of droplet–vortex interaction with a Karman vortex street

International Journal of Heat and Fluid Flow, 2006
Abstract Predicting fuel spray interaction with large scale vortex structures still is a major challenge for state-of-the-art CFD codes. In order to elucidate the mechanisms involved, a fundamental study has been carried out in which the interaction of water droplets with a Karman vortex street is investigated.
M. Burger, R. Schmehl, R. Koch, S. Wittig, H.-J. Bauer   +4 more
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