Results 141 to 150 of about 475 (186)

The devastating impact of conflict in Sudan on mental health services: a rapid review. [PDF]

Discov Ment Health
Osman WM, Mohamed LA, Nashwan AJ.
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Kinematics and muscle activity of pectoral fins in rainbow trout (Oncorhynchus mykiss) station holding in turbulent flow.

J Exp Biol
Gibbs BJ, Akanyeti O, Liao JC.
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Instability of vortex streets

Dynamical 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
R S Mackay
exaly   +2 more sources

Experimental Investigation of Vortex Streets

Journal of the Physical Society of Japan, 1965
Vortex streets behind circular cylinders and fiat plates were investigated experimentally in a water tank. Photography and hot-wire techniques were used. The important points resulting from the investigation are as follows. (1) Walls increase the stability of the wake. (2) Two parallel walls have a compressing effect on the vortex street.
Sadatoshi Taneda
exaly   +2 more sources

Vortex streets in the earth's atmosphere

Pure and Applied Geophysics, 1967
Calculations of the Heisenberg parameter and Strouhal number, for mesoscale vortex streets in the atmosphere, support the analogy with the classical Karman vortex wake. Revised estimates of the horizontal coefficient of eddy diffusion are obtained.
J N Hunt
exaly   +2 more sources

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.
Suchuan Dong, George Karniadakis
exaly   +3 more sources

Robustness of vortex streets

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
openaire   +2 more sources

Formation of Vortex Streets

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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The formation of vortex streets

Journal of Fluid Mechanics, 1962
The 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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Interaction of Vortex Streets

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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