Sum-Frequency Diffraction Loads on Tension-Leg Platforms in Bidirectional Waves

[+] Author and Article Information
J. H. Vazquez, A. N. Williams

Department of Civil and Environmental Engineering, University of Houston, Houston, TX 77204-4791

J. Offshore Mech. Arct. Eng 119(1), 14-19 (Feb 01, 1997) (6 pages) doi:10.1115/1.2829038 History: Received August 23, 1995; Revised March 04, 1996; Online December 17, 2007


Second-order diffraction theory is utilized to compute the sum-frequency diffraction loads on a deepwater tension-leg platform (TLP) in bidirectional waves. The linear diffraction solution is obtained utilizing a Green function approach using higher-order boundary elements. The second-order hydrodynamic loads explicitly due to the second-order potential are computed using the indirect, assisting radiation potential method. An efficient numerical technique is presented to treat the free-surface integral which appears in the second-order load formulation. Numerical results are presented for a stationary ISSC TLP in water of infinite depth. It is found that wave directionality may have a significant influence on the second-order hydrodynamic loads on a TLP and that the assumption of unidirectional waves does not always lead to conservative estimates of the sum-frequency loading.

Copyright © 1997 by The American Society of Mechanical Engineers
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