ON THE WAVEMAKING RESISTANCE AND SQUAT OF A CATAMARAN MOVING AT HIGH SPEED IN A SHALLOW WATER CHANNEL

The wavemaking of a fast catamaran moving uniformly in a straight rectangular shallow water channel was theoretically investigated using the mathematical technique of matched asymptotic expansions. The far-field flow around the ship was approached by a nonlinear shallow water wave theory; near field flow, by an improved slender-body theory. The mutual hydrodynamic interaction between the two hulls was approximated by means of sectional blockage coefficients in cross-flow as well as by a suitable Kutta condition at the stern. The resulting nonlinear initial-boundary problem governed by a modified KP equation was solved by a finite- difference method. Satisfactory agreement between the calculations and measurements previously carried out in a model tank was obtained for practically relevant integral quantities such as wave resistance, sinkage and trim over a broad range of speed (0.5 Fnh 2.5). At supercritical speeds the specific wave resistance of a ship was found to be reduced significantly by using a twin hull instead of a monohull.

• Supplemental Notes:
  • FAST '95, 3rd Intl Conf on Fast Sea Transportation, 25-27 Sept 1995; Lubeck-Travemunde, Germany. Procs. Ed by C.F.L. Kruppa. Publ by Schiffbautechnische Gesellschaft, Germany. Vol 2, p 1313 [13 p, 11 ref, 1 tab, 8 fig]
• Authors:
  • Jian, T
  • Sharma, S D
  • Chen
  • X-N
• Publication Date: 1995

Language

• English

Subject/Index Terms

• TRT Terms: Catamarans; Navigation; Ship motion; Wave resistance
• Uncontrolled Terms: High speed vessels; Squat
• Old TRIS Terms: Shallow water effects
• Subject Areas: Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00733485
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Mar 27 1997 12:00AM