Pressure-fluctuation measurements on an oscillating circular cylinder

Bearman, P. W.; Currie, I. G.

doi:10.1017/s0022112079000392

Cited by 79 publications

(46 citation statements)

References 6 publications

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“…Their results showed a departure from two-dimensionality a short distance behind the cylinder that translated into more elongated and slightly weaker vortices, with a longer time averaged recirculation length. A slight phase difference between the two simulations was also observed and the 3D simulation showed better agreement with the experimental work of [10] at equivalent reduced velocity. Finally, the 3D simulation predicted smaller time averaged drag coefficient and absolute pressure than the 2D simulations and it was concluded that the deviations between the simulations were attributed to three-dimensionality of the wake.…”

Section: B Moving Cylinderssupporting

confidence: 53%

Numerical Investigation of the Influence of Span-wise Force Variation in Circular Cylinders Undergoing Vortex Induced Vibrations at High Reynolds Number

Murrin

Militzer

Bose³

et al. 2007

Oceans 2007

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Abstract-The focus of this research is on the development of a new approach for simulating vortex induced vibrations on marine risers at high Reynolds numbers. This method considers the span-wise variation of the lift and drag forces, and determines the moment acting on the cylinder. The predicted motion then consists of a rotational component to accompany the traditional cross-stream and stream-wise translations normally associated with vortex induced vibrations. This was accomplished by describing the motion of the cylinder using a set of springs and dampers. A moment acting on the cylinder causes the springs on one end to compress, and stretch on the other, thus rotating the cylinder.A Large Eddy Simulation (LES) computational fluid dynamics code running on 16 3Ghz processors was used to calculate the unsteady flow and at each time step the hydrodynamic forces acting on the cylinder were calculated in a separate routine based on the pressure distribution around the cylinder. This information was then used to solve two second-order ordinary differential equations, which gave the velocity and displacement of the cylinder in cross-flow and rotational planes. This information was transferred back to the code where the cylinder was displaced and another cycle of calculations was started.The simulated results showed that the correlation length was higher for a cylinder subject to pure translation compared to a cylinder free to translate and rotate in the cross-stream direction. This has implications for current numerical and experimental techniques since it has been traditionally assumed that the flow around a circular cylinder becomes two-dimensional during vortex induced vibrations. Consequently, empirical,numerical and experimental models have generally only considered cross stream and/or stream-wise translation. The extent to which the experimental apparatus or harmonic model may have influenced the behavior of the riser by eliminating span-wise amplitude variation is important information that should be considered for future riser designs.

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Section: B Moving Cylinderssupporting

confidence: 53%

Numerical Investigation of the Influence of Span-wise Force Variation in Circular Cylinders Undergoing Vortex Induced Vibrations at High Reynolds Number

Murrin

Militzer

Bose³

et al. 2007

Oceans 2007

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“…Bearman & Currie 1979;Williamson & Roshko 1988;Brika & Laneville 1993). While the sets of phenomena are undoubtedly related, a switch in timing associated with a change in sign of mechanical energy transfer cannot be observed in vortex-induced vibration experiments, at least not when the vibration and shedding are completely entrained and periodic.…”

Section: Phenomena Of Vortex-induced Vibrationmentioning

confidence: 99%

A study of two-dimensional flow past an oscillating cylinder

1999

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In this paper we describe a detailed study of the wake structures and flow dynamics associated with simulated two-dimensional flows past a circular cylinder that is either stationary or in simple harmonic cross-flow oscillation. Results are examined for Re = 500 and a fixed motion amplitude of y max /D = 0.25. The study concentrates on a domain of oscillation frequencies near the natural shedding frequency of the fixed cylinder. In addition to the change in phase of vortex shedding with respect to cylinder motion observed in previous experimental studies, we note a central band of frequencies for which the wake exhibits long-time-scale relaxation oscillator behaviour. Time-periodic states with asymmetric wake structures and non-zero mean lift were also observed for oscillation frequencies near the lower edge of the relaxation oscillator band. In this regime we compute a number of bifurcations between different wake configurations and show that the flow state is not a unique function of the oscillation frequency. Results are interpreted using an analysis of vorticity generation and transport in the base region of the cylinder. We suggest that the dynamics of the change in phase of shedding arise from a competition between two different mechanisms of vorticity production.

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“…With the increase in Ur, the vortex with the same circulation is shed when the cylinder reaches the maximum amplitude on the same side. Bearman and Currie (1979), using controlled forced-vibration experiments at fixed amplitudes, have shown that although the significant change occurs over a small range of Ur, it is progressive and not a discontinuity.…”

Section: -44mentioning

confidence: 99%

Flow-Induced Vibration of Circular Cylindrical Structures

Chen

1985

159

203

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A major purpose of the Technical Information Center is to provide the broadest dissemination possible of information contained in DOE's Research and Development Reports to business, industry, the academic community, and federal, state and local governments.Although a small portion of this report is not reproducible, it is being made available to expedite the availability of information on the research discussed herein. ANL-85-51 ------------------------------ 11-6References--Sec. Current DOE funding for this work is from the Office of Reactor Systems, Development and Technology within the Office of Nuclear Energy.A significant amount of material presented in this report is taken from the results of various program activities sponsored by AEC, ERDA, and DOE at ANL.The author is indebted to those who supported the program at ANL throughout the years, in particular, Messrs. Nicholas Grossman and Chet Bigelow for their interest and recognition of this important and challenging subject.The author is grateful for the support received from his colleagues of the Vibration Analysis Section of the Components Technology Division of ANL, which provides the resources necessary to perform this work.The Section Manager, Dr. M. W. Wambsganss, with his unfaltering faith in me, gave me encouragement and confidence to complete this report.Grateful appreciation is expressed to Miss Joyce Stephens for her superb typing and word-processing and to Mrs. S. K. Zussman for her expert editing of the manuscript. 28 CREDITSThe author and Argonne National Laboratory gratefully acknowledge the courtesy of the organizations aLid individuals who granted permission to use illustrations and. other information in this report.The sources of this information are listed below. Figs. 6.3, 6.4 This report summarizes the flow-induced vibration of circular cylinders in quiescent fluid, axial flow, and crossf low, and applications of the analytical methods and experimental data in design evaluation of various system components consisting of circular cylinders.

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Pressure-fluctuation measurements on an oscillating circular cylinder

Cited by 79 publications

References 6 publications

Numerical Investigation of the Influence of Span-wise Force Variation in Circular Cylinders Undergoing Vortex Induced Vibrations at High Reynolds Number

Numerical Investigation of the Influence of Span-wise Force Variation in Circular Cylinders Undergoing Vortex Induced Vibrations at High Reynolds Number

A study of two-dimensional flow past an oscillating cylinder

Flow-Induced Vibration of Circular Cylindrical Structures

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