Results 191 to 200 of about 921 (215)

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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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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Single Vortex Streets on the Sphere

ASME 2008 Dynamic Systems and Control Conference, Parts A and B, 2008
We study arrangements of point vortices on a sphere in the form of a single von Ka´rma´n vortex street, with and without the addition of pole vortices using the configuration matrix approach recently introduced by (1) and (2) on the sphere. We derive the general form of the von Ka´rma´n matrix thereby obtaining all possible vortex strengths for which ...
George C. Chamoun, Eva Kanso, Paul K. Newton   +2 more
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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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An unusual atmospheric vortex street

Environmental Fluid Mechanics, 2019
Atmospheric vortex streets quite often form in the wake of tall islands in the marine atmospheric boundary layer. Most satellite pictures of this phenomenon show that two rows of staggered, counter-rotating vortices are aligned more or less in a straight line downstream of the islands, like Karman vortex streets behind cylindrical obstacles.
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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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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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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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Interaction of a starting vortex as well as a vortex street with a traveling shock wave

AIAA Journal, 1965
The passage of a shock front and the associated drift flow over a two-dimensional airfoil, at an angle of attack mounted in a shock tube, generated a columnar spiral starting vortex that interacted with the normal reflected shock. Interferometric investigations of this interaction extended considerably earlier schlieren observations by Hollingsworth ...
Dosanjh, D. S., Weeks, T. M.
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Elimination of Vortex Streets in Bluff-Body Flows

Physical Review Letters, 2008
We present an effective technique for suppressing the vortex-induced vibrations of bluff bodies by eliminating the von Kármán street formed in their wake. Specifically, we find that small amounts of combined windward suction and leeward blowing around the body modify the wake instability and lead to suppression of the fluctuating lift force.
S, Dong, G S, Triantafyllou, G E, Karniadakis   +2 more
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