AN APPROXIMATE CALCULATION METHOD FOR MANOEUVRING HYDRODYNAMIC FORCES ON SHIP HULLS IN A NARROW WATER CHANNEL

The paper describes a simplified method for calculating manoeuvring hydrodynamic forces on a ship taking off-centreline course in a narrow channel. Calculation is made using infinite images with respect to the side walls and the water bottom. The ship body is replaced by sources and vortices distributed in the centre plane. The source strength is proportional to the slope of a distribution curve of ship width. The hydrodynamic forces are evaluated on the basis of the linear lifting surface theory. Numerical calculation is made by changing channel width, water depth and off- centreline displacement systematically. Calculated values are compared with the experimental results presented by Fujino. As a result, it is indicated that the calculated values agree qualitatively with the experimental results. The value of the correction factor, which is introduced to provide effective width of the channel, is almost constant regardless of ship form, channel width and water depth.

• Supplemental Notes:
  • J Kansai Soc Naval Arch, n 225, March 1996, p 133 [7 p, 8 ref, 2 tab, 6 fig]
• Authors:
  • Yumuro, A
• Publication Date: 1996

Language

• Japanese

Subject/Index Terms

• TRT Terms: Hydrodynamic pressure; Maneuverability; Numerical analysis
• Old TRIS Terms: Hydrodynamic forces; Narrow channels
• Subject Areas: Marine Transportation;

Filing Info

• Accession Number: 00733282
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Mar 27 1997 12:00AM