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TECHNICAL PAPERS

Numerical Prediction of the Hydrodynamic Loads and Vortex-Induced Vibrations of Offshore Structures

[+] Author and Article Information
Karl W. Schulz, Yannis Kallinderis

Offshore Technology Research Center, The University of Texas at Austin, Austin, TX 78712-1085

J. Offshore Mech. Arct. Eng 122(4), 289-293 (Jun 22, 2000) (5 pages) doi:10.1115/1.1315302 History: Received November 20, 1999; Revised June 22, 2000
Copyright © 2000 by ASME
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References

Figures

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Illustration of surface roughness geometries: (a) ks/D=0.03, (b) ks/D=0.009
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Drag coefficient of a fixed cylinder as a function of surface roughness, Re=4×106 (supercritical). A roughness parameter of ks/D=0.0 indicates a smooth cylinder with no roughness. ▴ Present numerical results; ▪ experimental results from reference 9.
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Transverse displacement history of an elastically mounted cylinder undergoing VIV near the critical regime; Ured=7.02,Re=3.25×105
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Transverse RMS displacements of an elastically mounted cylinder throughout the lock-in regime; numerical solutions developed continuously. (4.86≤Ured≤10.26). ▪ Present numerical results; ▴ experimental results from reference 10.
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Transverse RMS displacements of an elastically mounted cylinder throughout the lock-in regime; numerical solutions developed independently (4.86≤Ured≤10.26). ▪ Present numerical results; ▴ experimental results from reference 10.
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Velocity vector snapshot of a fairing geometry vibrating freely in the transverse direction. Ured=6.5,Re=1.27×104. The dark horizontal line is a stationary reference point and corresponds to the mean coordinate about which the fairing vibrates.
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Velocity vector snapshot of a helical strake geometry vibrating freely in the transverse direction. Ured=6.5,Re=1.27×104. The dark horizontal line is a stationary reference point and corresponds to the mean coordinate about which the cylinder vibrates.
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Comparison of VIV displacements of a cylinder with and without suppression devices. • Bare cylinder cross section; ▪ helical strakes cross section; ▴ fairing cross section.

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