WAVE RESISTANCE AND SQUAT OF A SLENDER SHIP MOVING NEAR THE CRITICAL SPEED IN RESTRICTED WATER

The wave resistance and implied squat of a slender ship advancing near the critical speed in restricted waters are studied. Employing matched asymptotic expansion techniques, it is shown that the response can be described by the homogeneous Kadomtsev-Petviashvili equation with flux conditions on boundaries when the channel is wide compared to ship length. Numerical results show the generation and radiation of straight-crested solitons in a periodic manner ahead of the ship. The solitons are initially three-dimensional, and are followed by a depressed region and a train of complicated ship-bound waves in the wake. Hydrodynamic forces are computed by using slender body approximation, and the implied sinkage and trim are estimated based on hydrostatic relations. These quantities vary with time, and strongly depend on ship speed and blockage. Near the critical speed, the wave resistance and the trim oscillate around mean values in phase with the emission of solitons, while the sinkage takes place out of phase. The calculated results are in crude agreement with the measurements.

Media Info

  • Features: References;
  • Pagination: 16p., incl. discuss.

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Filing Info

  • Accession Number: 00661090
  • Record Type: Publication
  • Source Agency: Maritime Technical Information Facility
  • Files: TRIS
  • Created Date: Jul 21 1994 12:00AM