COMPARISON OF LOADS PREDICTED USING "NEWWAVE" AND OTHER WAVE MODELS WITH MEASUREMENTS ON THE TERN STRUCTURE

Global wave loads measured on the Tern platform during a very severe storm have been compared with predictions made on the basis of three different model for wave kinematics. The first is the "Newwave" theory, a broadbanded, probabilistic-based model for the extreme waves of a random seastate. The second model involves complex time-domain simulation of random directional seas. Both these theories are used with the Morison equation and realistic force coefficients to predict global forces. The third wave model is the Stokes fifth-order theory with artificial values for the force coefficients, as used in conventional design practice. Both the Newwave theory and the random directional simulations lead to predicted base shear forces that are comparable to the measured values over a wide range. If non-linear effects in the ocean surface are accounted for, then the Newwave theory predicts the base shear generated by the largest wave of the storm with a very high degree of accuracy. In contract, calculations based on the Stokes kinematics of conventional design practice overpredict the measured loads over the whole range studied. It appears that Newwave is the most suitable available wave theory for routine use in the design and analysis of structures such as Tern.

• Supplemental Notes:
  • Wave Kinematics and Environmental Forces Conf; 24-25 March 1993; London, U.K. Soc for Underwater Technology, Advances in Underwater Technology, Ocean Sci and Offshore Engng Series, Vol. 29 Pubs by Kluwer Academic Publishers 1993, ISBN 0-7923-2184-7, Session 2, p 143 [17 p, 14 ref, 11 fig]
• Authors:
  • Rozario, J B
  • Tromans, P S
• Publication Date: 1993

Language

• English

Subject/Index Terms

• TRT Terms: Force; Kinematics; Wave measurement; Waves
• Uncontrolled Terms: Wave models
• Old TRIS Terms: Wave forces on structures
• Subject Areas: Marine Transportation;

Filing Info

• Accession Number: 00705143
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Aug 14 1995 12:00AM