Numerical Simulation of Multiple Floating Structures With Nonlinear Constraints

[+] Author and Article Information
Subrata K. Chakrabarti

Offshore Structure Analysis, Inc., 13613 Capista Dr., Plainfield, IL 60544e-mail: chakrab@aol.com

J. Offshore Mech. Arct. Eng 124(2), 104-109 (Apr 11, 2002) (6 pages) doi:10.1115/1.1463735 History: Received June 01, 2001; Revised November 01, 2001; Online April 11, 2002
Copyright © 2002 by ASME
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Dimelow, D. J., Neilson, R. D., and O’Donoghue, T., 1996, “Non-Linear Tower Motions in Waves,” Proc. of Sixth Conf. on Offshore and Polar Engineering, Los Angeles, CA, pp. 240–246.
Gottlieb, O., 1996, “Bifurcations of a Nonlinear Small-Body Ocean Mooring System Excited by Finite Amplitude Waves,” Proc. of Int. Conf. Offshore Mechanics and Arctic Engineering, ASME.
Chakrabarti, S. K., 1990, Nonlinear Methods in Offshore Engineering, Elsevier, Amsterdam.
Chantrel, J., and Marol, P., 1987, “Subharmonic Response of Articulated Loading Platform,” Proc. of Sixth Conf. on Offshore Mechanics and Arctic Engineering, Houston, TX, pp. 35–43.
Chakrabarti, S. K., 1987, Hydrodynamics of Offshore Structures, Computational Mechanics Publications, Southampton, UK.
Chakrabarti,  S. K., and Cotter,  D. C., 1989, “Motions of Articulated Towers and Moored Floating Structures,” ASME J. Offshore Mech. Arct. Eng., 111(3), pp. 233–241.
Newman,  J. N., 1967, “The Drift Force and Moment on Ships in Waves,” J. Ship Res., II, pp. 51–60.


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Definition sketch for a multibody moored system
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Comparison with frequency domain sway motion of supply vessel at the lee of an ISSC TLP
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Free oscillation of the SLIM tower model
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Oscillation of the SLIM tower in regular 1.75 sec wave
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Comparison of experimental data of SLIM with the time and frequency domain solution (L—low wave height; M—medium wave height; H—high wave height)
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Experimental motion of the top of free SLIM tower in 1.75 sec wave
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Numerical solution of free SLIM tower motion in 1.75 sec regular wave and cross current of 0.05 ft/s (omega—angle in wave direction; epsilon—angle in transverse direction)
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Experimental (left) versus numerical (right) results of free SLIM tower motion in 2.75 sec regular wave of high height (view from top; wave direction from bottom to top)
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Response time history of a single-point mooring system in random head waves (top plot—wave profile; 2nd plot—tower inclination; 3rd plot—tanker surge; bottom plot—mooring line load)



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