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TECHNICAL PAPERS

Mitigation of Current-Driven, Vortex-Induced Vibrations of a Spar Platform via “SMART” Thrusters

[+] Author and Article Information
F. Joseph Fischer

Office of Corporate Relations, MIT, Cambridge, MA (formerly, Shell International E&P Technology, Houston, TX)

Stergios I. Liapis

Offshore Structures, Shell E&P Technology Company, Houston, TX

Yannis Kallinderis

J. Offshore Mech. Arct. Eng 126(1), 96-104 (Mar 02, 2004) (9 pages) doi:10.1115/1.1643086 History: Received October 01, 2002; Revised March 01, 2003; Online March 02, 2004
Copyright © 2004 by ASME
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References

Schulz,  K., and Kallinderis,  Y., 2000, “Three-Dimensional Numerical Prediction of the Hydrodynamic Loads and Motions of Offshore Structures,” ASME J. Offshore Mech. Arct. Eng., 122, pp. 294–300.
Schulz,  K., and Kallinderis,  Y., 2000, “Numerical Prediction of the Hydrodynamic Loads and Vortex-Induced Vibrations of Offshore Structures,” ASME J. Offshore Mech. Arct. Eng., 122, pp. 289–293.
Kallinderis,  Y., and Nakajim,  K., 1994, “Finite-Element Method for Incompressible Viscous Flows with Adaptive Hybrid Grids,” AIAA J., 32, pp. 1617–1625.
Kallinderis,  Y., 1992, “A Finite-Volume Navier-Stokes Algorithm for Adaptive Grids,” Int. J. Numer. Methods Fluids, 15, pp. 193–217.
Kallinderis,  Y., and Baron,  J. R., 1989, “Adaptation Methods for a New Navier-Stokes Algorithm,” AIAA J., 27, pp. 37–43.
Sarpkaya, T., and Isaacson, M., 1981, Mechanics of Wave Forces on Offshore Structures, Van Nostrand Reinhold Company, New York.
Allen, D. W., and Henning, D. L., 1997, “Vortex-Induced Vibration Tests of a Flexible Smooth Cylinder at Supercritical Reynolds Numbers,” Proceedings of the 1997 ISOPE Conference, III , pp. 680–685, Honolulu, HI.

Figures

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Main dimensions of the spar platform
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Mathematical modeling of the spar as an elastically mounted circular cylinder subjected to a uniform current
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Example of a grid employed in 2-D numerical simulations
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Numerical results of the maximum transverse VIV displacements of the spar as a function of the Reynolds number
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Velocity profiles of the 5-Year and the 100-Year Loop Current Events
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Thruster coefficient history for the clipped D-controller with the thrust coefficient (CT)max=0.15
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Transverse VIV displacement for the clipped D-controller with the thrust coefficient (CT)max=0.15
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Maximum transient transverse VIV displacement as a function of the max allowable thrust coefficient
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Maximum steady-state transverse VIV displacement as a function of the max allowable thrust coefficient
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Current build-up over five vibration periods—Transverse VIV displacement for the clipped D controller with the thrust coefficient (CT)max=0.15
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Current build-up over five vibration periods—Thrust coefficient history for the clipped D controller with the thrust coefficient (CT)max=0.15
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Delayed detection until 3rd peak—Transverse VIV displacement for the clipped D controller with the thrust coefficient (CT)mx=0.15
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Transverse VIV displacement for the clipped D controller with the thrust coefficient (CT)max=0.15
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Thruster coefficient history for the clipped D controller with the thrust coefficient (CT)max=0.15
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Transverse VIV displacement for the spar with no control applied
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In-line drag coefficient for the spar with no control applied
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Contours of the velocity perpendicular to the flow direction
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Streamlines captured in the vortex core
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Transverse VIV displacement for the clipped D controller with the thrust coefficient (CT)max=0.15
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Drag coefficient for the spar for the clipped D controller with the thrust coefficient (CT)max=0.15
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Proposed arrangement of the 4,000 hp thruster units

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