RELATIVE MOTIONS AND SWELL-UP FOR A FRIGATE BOW

A comprehensive investigation has been carried out into the vertical relative motion of the water surface along the bow of a frigate running in a seaway. In particular, attention was focussed on the dynamic 'swell-up', i.e., the effect of water being pushed up around the bow higher than can be accounted for by considering heaving, pitching and incident wave alone. The investigation included various kinds of experiments, including free-running tests in waves and still water, restrained model tests in waves and still water and oscillation tests in still water. Parallel to this, calculations as to ship motions and still water bow wave system were carried out. On the basis of the experiments and the calculations a 'swell-up coefficient' is defined and it is demonstrated that inclusion of the latter will greatly improve the prediction of shipment of water and emergence of the forefoot of a frigate hull form. Finally, the findings of the investigation are evaluated and synthesized into a design procedure that can easily be linked to the widely used strip theory method in ship motion calculation.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00358967
• Supplemental Notes:
  • Transactions paper; Also in Naval Architect, July/August 1984 issue
• Authors:
  • Blok, J J
  • Huisman, J
• Publication Date: 1984

Media Info

• Features: References;
• Pagination: 18 p.
• Serial:
  • Royal Institution of Naval Architects Transactions
  • Volume: 126
  • ISSN: 0035-8967

Subject/Index Terms

• TRT Terms: Bow waves; Bows; Frigates; Ship motion
• Uncontrolled Terms: Model tests; Relative motion
• Old TRIS Terms: Swell up
• Subject Areas: Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00649394
• Record Type: Publication
• Source Agency: Maritime Technical Information Facility
• Files: TRIS
• Created Date: Jul 21 1994 12:00AM