ON THE ACCURACY OF THE STRIP THEORY USED IN CALCULATING SHIP MOTIONS IN WAVES

It is well known that the strip theory is based on many assumptions. Of those, three-dimensional effect, advance speed effect, viscosity effect, section-shape effect and finite water depth effect are studied in this paper, and their correction coefficients are given. The accuracy of the strip theory is examined by comparing the responses, with and without correction, of the ship in regular head seas. The effect of viscosity and section-shape may be practically ignored. But three-dimensional effect and advance speed effect are rather large over the wide range of wavelength to ship length ratio. There is little effect on hydrodynamic forces and on ship motions when water depth-ship length ratio h/L is greater than 1, but when h/L is less than 0.5, they are affected by the finite depth, and computed ship motions show a little decrease compared with those of infinite depth.

• Corporate Authors:

  Society of Naval Architects of Japan

  23 Shiba-kotohiracho, Minato-ku
  Tokyo 135,   Japan 
• Authors:
  • TAKAGI, M
  • Ganno, M
• Publication Date: 1970

Media Info

• Features: References;
• Pagination: p. 118-141
• Serial:
  • Selected Papers, J of Soc of Naval Arch of Japan
  • Volume: 4
  • Publisher: Society of Naval Architects of Japan

Subject/Index Terms

• TRT Terms: Fluid dynamics; Ship motion; Thinness; Waves
• Old TRIS Terms: Slender bodies; Wave effects
• Subject Areas: Design; Marine Transportation;

Filing Info

• Accession Number: 00035128
• Record Type: Publication
• Source Agency: Society of Naval Architects of Japan
• Files: TRIS
• Created Date: Oct 27 1972 12:00AM