Results 191 to 200 of about 909 (221)

3-D Vortex Structures Superposed on Karman Vortex Street

The Proceedings of the Fluids Engineering Conference, 2004
Yusuke IMAMURA, Masanori MATSUMURA
exaly   +2 more sources

Karman vortex streets in wakes of islands.

AIAA Journal, 1965
W 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
openaire   +1 more source

Modeling and Control of Karman Vortex Streets

1991
One of the most important problems in hydrodynamics is the behaviour of low-dimensional dynamics in closed and open flows. Lorenz 1 and Ruelle & Takens 2 proposed that the dynamics of a hydrodynamic system at the onset of turbulence could be described by strange attractors and low-dimensional differential equations.
E. Roesch, F. Ohle, H. Eckelmann, A. Hübler   +3 more
openaire   +1 more source

Karman vortex street parametrization with image processing application

SPIE Proceedings, 2003
The karman vortex street phenomenon is applied in the vortex flowmeter. Application of various methods of investigations is necessary in the course of getting increased knowledge of the phenomenon. Flow visualization being the leading method of aero- and hydrodynamic phenomena investigations enables qualitative evaluation in micro-scale.
Grzegorz Pankanin, Artur Kulinczak, Jerzy Berlinski   +2 more
openaire   +1 more source

Destabilization of the Karman vortex street by frequency-modulated excitation

Physics of Fluids A: Fluid Dynamics, 1991
A two-dimensional cylinder is subjected to frequency-modulated excitation in the cross-stream direction. Transition from a locked-in response to a completely destabilized response can be attained by lowering the value of modulation frequency while all other parameters are maintained constant.
M. Nakano, D. Rockwell
openaire   +1 more source

Frequency of the Karman Vortex Streets in Tube Banks

The Journal of the Royal Aeronautical Society, 1967
In the note “Aerodynamically induced vibration in coolers”, by D. G. Mabey (pp 876-7, December 1965 Journal), the results of Grotz and Arnold concerning the frequency of the Karman vortex streets in tube banks, such as in heat exchangers, are mentioned, as is also the law of the linear relation between f(T—d)/V and (2T-L)/d, as found by Putnam, where f
openaire   +1 more source

Elliptical-inertial instability of rotating Karman vortex streets

Physics of Fluids, 2005
Clouds often reveal a small-scale vortex shedding in the wake of mountainous islands. Unlike the classical bidimensional Karman street, these observed vortex streets are affected by the earth’s rotation and vertical stratification of the atmosphere. These effects induce a selective destabilization of anticyclonic vorticity regions.
Stegner, A., Pichon, T., Beunier, M.
openaire   +1 more source

On the Impingement of von Karman Vortex Street on a Delta Wing

22nd Applied Aerodynamics Conference and Exhibit, 2004
It is well known that aircraft undergoing high angle of attack excursions (e.g., the Cobra maneuver) may experience asymmetric forebody vortex shedding under certain conditions. The detachment of these vortices from the forebody is similar to that observed from von Karman vortex shedding from cylinders.
Ismael Heron, Roy Myose
openaire   +1 more source

ON POSSIBLE WAYS OF DISTURBANCE PROPAGATION ALONG KARMAN VORTEX STREETS

TsAGI Science Journal, 2011
exaly   +2 more sources

Spectral Element Calculation of a Von Karman Vortex Street

Fluids Engineering, 1996
Abstract This paper presents results for the direct numerical simulation of unsteady two-dimensional incompressible flow past a circular cylinder at a Reynolds number of 140. Conforming and nonconforming formulations of the spectral element method have been employed to compare the grid resolution reqirements for the von Karman vortex ...
openaire   +1 more source