Results 241 to 250 of about 254,596 (292)
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On the accurate calculation of vortex shedding
Physics of Fluids A: Fluid Dynamics, 1990The issue of accuracy and convergence for numerical calculations in situations in which the exact solution of the Navier–Stokes equations (under the imposed initial and boundary conditions) is unstable is discussed. If one relies on roundoff error or truncation error (or the randomness of a stochastic scheme) in order to perturb the computed solution ...
Christopher R. Anderson +3 more
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Vortex shedding in unsteady flow
Journal of Wind Engineering and Industrial Aerodynamics, 1983Abstract Previous experiments by other workers have shown that when a cylinder vibrates in a steady flow the frequency of the vortex shedding from the cylinder can synchronize with the frequency of the cylinder's vibration. As a result the shedding frequency remains constant over a range of flow velocities, and the oscillatory forces acting on the ...
F.H. Barnes, I. Grant
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The active control of vortex shedding
Journal of Fluids and Structures, 1989This paper describes an active method of controlling vortex shedding from a circular cylinder at Reynolds number 400. The control was effected by an acoustic feedback of signals taken from hot-wires in the wake of the cylinder. The velocity fluctuation at the nominal vortex shedding frequency is reduced throughout the wake, in places by more than 30 ...
J.E. Ffowcs Williams, B.C. Zhao
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Coupling of vortex shedding with a cavity
Fluid Dynamics Research, 1988A pulsating flow within a tube with one end sealed and the other end open, facing a low-velocity wind tunnel flow, may be generated by using a wedge trip placed upstream of the open end of the tube. However, a reasonable explanation about the generating mechanism of the pulsating flow within the resonator coupled with a tripping device has not been ...
Masaaki Kawahashi +2 more
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Vortex shedding in rotating flows
Geophysical & Astrophysical Fluid Dynamics, 1983Abstract A rotating tow facility whose principle element is a long acrylic channel of rectangular cross-section has been developed. A smooth flexible belt, which can be translated along the channel axis, serves as a false horizontal floor. The system is mounted on a turntable which rotates at a constant angular speed about a vertical axis.
Don L. Boyer, Michael L. Kmetz
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Vortex shedding and the voice source
The Journal of the Acoustical Society of America, 2007The voice source is primarily an acoustic dipole produced by the fluctuating drag on the vocal folds [Zhao, Zhang, Frankel et al., J. Acoust. Soc. Am. 112, 2134–2146 (2002)]. In this paper the unsteady drag is determined theoretically in terms of the vorticity shed from the vocal folds.
Michael S. Howe, Richard S. McGowan
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Vortex shedding-free strainers
Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering, 2011The subject of the periodic vortex shedding behind bluff bodies, which exhibits oscillatory behaviour, is of direct relevance to many practical applications, e.g. pipelines and heat exchangers. Repetitive failures were occurring in associated piping components on the suction of a sales gas compressor. Available experimental investigations indicated the
Y Khulief +6 more
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A “robust” vortex-shedding anemometer
Experiments in Fluids, 1993A simple device has been constructed for the purpose of monitoring low air speeds. Two such devices have been calibrated to cover the speed range 0.4 to 1.3 m/s, and have shown linear characteristics of frequency versus speed. Flow visualization has shown the absence of end cells and the presence of parallel shedding in the case of low-aspect-ratio ...
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On the mechanism of symmetric vortex shedding
Journal of Fluids and Structures, 2019Abstract In this paper, we study the vortex-shedding mechanism of a square cylinder subjected to a mean flow with a superimposed pulsatile flow, under symmetric vortex shedding conditions. The near-body vortical events are interpreted in accordance with the two-dimensional vorticity transport equation, and the interactions between different vortical ...
Krishnan Hrisheekesh +4 more
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Natural and Forced Vortex Shedding
1981Natural and forced vortex shedding has been investigated experimentally over circular cylinders in the VPI water tunnel. Flow visualizations and Laser-Doppler Anemometry have been employed. Results indicate that in the lock-on region there are three distinct modes of vortex shedding.
G. S. Jones, C. Barbi, D. P. Telionis
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