A tanker moored in irregular head waves, with or without current, performs large-amplitude, low-frequency surge motions. The second order wave drift forces will be a function of tanker velocity. Using 3-D potential theory, the wave drift force for zero speed and low forward speed were computed. By means of the gradient method, the transfer function of the constant speed-dependent wave drift force and damping coefficient were derived and the latter was compared with model test results. Time-domain computations were then carried out for the low frequency surge motions in irregular waves with and without current, and compared with model test results. The computations were based on the wave train registrations as adjusted for the model tests. Prior to solving the equation of motion, the mean wave drift damping coefficient and the registration of the wave drift force with and without current were computed. Results, for the registration, were compared in terms of spectral densities with the results of model tests.

  • Supplemental Notes:
    • Conference paper; Paper OTC-5631
  • Authors:
    • Wichers, J E
  • Conference:
  • Publication Date: 0

Media Info

  • Features: References;
  • Pagination: 14p.

Subject/Index Terms

Filing Info

  • Accession Number: 00657703
  • Record Type: Publication
  • Source Agency: Maritime Technical Information Facility
  • Files: TRIS
  • Created Date: Jul 21 1994 12:00AM