Results 181 to 190 of about 16,312 (221)
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Physical Review E, 1994
We study the robustness of the vortex street behind a circular cylinder when there is transfer of momentum between the wake and the surrounding fluid. The model used to represent exchanges of momentum is based on L\'evy walks, as implemented in lattice-gas hydrodynamics.
, Hayot, , Wagner
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We study the robustness of the vortex street behind a circular cylinder when there is transfer of momentum between the wake and the surrounding fluid. The model used to represent exchanges of momentum is based on L\'evy walks, as implemented in lattice-gas hydrodynamics.
, Hayot, , Wagner
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Axial Flow in a Vortex in Karman Vortex Street.
Journal of the Japan Society for Aeronautical and Space Sciences, 1996The vortex filaments in a Karman vortex street are usually not parallel to the axis of a circular cylinder perpendicular to a uniform flow in a low speed wind tunnel, but incline to the axis of the cylinder. The axial flow to the upstream direction in a vortex was observed by means of flow visualization in each vortex of the Karman vortex street.
Nobuyuki OHKURA +2 more
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Journal of Applied Physics, 1953
It is shown that, for vortex trails in a nonviscous fluid, the mean longitudinal spacing a and mean transverse spacing h are invariant. It follows from this and other known facts, that the periodicity of a vortex trail is unstable, not the ratio h/a. In a viscous fluid, a is invariant but h increases.
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It is shown that, for vortex trails in a nonviscous fluid, the mean longitudinal spacing a and mean transverse spacing h are invariant. It follows from this and other known facts, that the periodicity of a vortex trail is unstable, not the ratio h/a. In a viscous fluid, a is invariant but h increases.
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The formation of vortex streets
Journal of Fluid Mechanics, 1962The formation of vortex streets in the wake of two-dimensional bluff bodies can be explained by considering the non-linear interaction of two infinite vortex sheets, initially a fixed distance, h, apart, in an inviscid incompressible fluid. The interaction of such sheets (represented in the calculation by rows of point-vortices) is examined in detail ...
Abernathy, F. H., Kronauer, R. E.
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Karman vortex streets in wakes of islands.
AIAA Journal, 1965W satellites equipped with narrow-angle cameras have revealed the existence of mesoscale eddies, which are on a scale too small to be delineated by the standard weather observation network and are too large to be seen by an observer on the ground or even pictured from a high-flying aircraft.
K. CHOPRA, L. HUBERT
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Journal of Applied Physics, 1964
Vortex street eddies shed from multiple cylinders located one behind the other in the plane of flow were observed to interact in a very complex fashion. Contraction, expansion, cancellation, and coalescence of vortices occurred for different values of cylinder separation and Reynolds number.
David G. Thomas, Kurt A. Kraus
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Vortex street eddies shed from multiple cylinders located one behind the other in the plane of flow were observed to interact in a very complex fashion. Contraction, expansion, cancellation, and coalescence of vortices occurred for different values of cylinder separation and Reynolds number.
David G. Thomas, Kurt A. Kraus
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Mechanism underlying Kármán vortex street breakdown preceding secondary vortex street formation
Physics of Fluids, 2016The Kármán street that develops behind a bluff body transforms in the far wake into a secondary vortex street of lower frequency and stronger vortices. Before this transformation, the primary street decays. This interesting phenomenon was investigated in a number of experimental and theoretical studies.
G. Ya. Dynnikova +2 more
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Dynamics and Stability of Systems, 1987
Karman's family of point vortex streets is unstable for all aspect ratios, being linearly stable for only a single value of aspect ratio. This property has been reported to hold for some more complicated families of vortex streets. It is proved here that all one-parameter families of two-dimensional inviscid x-periodic equilibrium vortex systems ‘close
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Karman's family of point vortex streets is unstable for all aspect ratios, being linearly stable for only a single value of aspect ratio. This property has been reported to hold for some more complicated families of vortex streets. It is proved here that all one-parameter families of two-dimensional inviscid x-periodic equilibrium vortex systems ‘close
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Journal of Fluid Mechanics, 1967
The flow in the wake of a two-dimensional blunt-trailing-edge body was investigated in the Reynolds number range, Reynolds number being referred to base height, 1·3 × 104 to 4·1 × 104. The effects of splitter plates and base bleed on the vortex street were examined. Measurements were made of the longitudinal spacing between vortices and the velocity of
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The flow in the wake of a two-dimensional blunt-trailing-edge body was investigated in the Reynolds number range, Reynolds number being referred to base height, 1·3 × 104 to 4·1 × 104. The effects of splitter plates and base bleed on the vortex street were examined. Measurements were made of the longitudinal spacing between vortices and the velocity of
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Journal of Geophysical Research: Space Physics, 1990
This paper presents the hypothesis that the periodic meridional (north–south) flows observed by Voyager 2 in the neighborhood of 20–25 AU were produced by a heliospheric vortex street. The separation of the vortices was approximately 6 AU in the radial direction, and the vortices were carried away from the sun at a speed of approximately 425 km/s. This
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This paper presents the hypothesis that the periodic meridional (north–south) flows observed by Voyager 2 in the neighborhood of 20–25 AU were produced by a heliospheric vortex street. The separation of the vortices was approximately 6 AU in the radial direction, and the vortices were carried away from the sun at a speed of approximately 425 km/s. This
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