BOW FLOW AND ADDED RESISTANCE OF SLENDER SHIPS AT HIGH FROUDE NUMBER AND LOW WAVE LENGTHS

In a 1980 paper <see Abs. No. 56654, Dec. 1981>, the present Author <of the Norwegian Institute of Technology, Trondheim> and others derived a formula for the added resistance of ships with blunt bow forms in low wave lengths. In the present paper, he derives a formula for the added resistance of a slender ship at high Froude number and low wave length, a problem whose solution necessitates prediction of wave elevation around the bow in head sea waves. The procedure is based on linear theory, and the problem is simplified by the use of matched asymptotic expansions; instead of solving a three-dimensional Laplace equation, a two-dimensional Laplace equation is solved in cross-sectional planes in the bow region. The method is explained under the headings:- Three-dimensional problem; Approximate bow flow solution; Far-field solution; Bow near-field solution and matching; Numerical solution. Some conclusions are drawn on comparisons of the results with those of other methods; few experimental results are available, but those for the added resistance of a cargo ship of 0.61 block coefficient show higher values than those predicted. Further experimental studies of wave elevation around a bow at high Froude number and short wave lengths sre needed for a definite conclusion in the unsteady case.

  • Supplemental Notes:
    • J. Ship Res., 27 <1983>, p.160 <Sept.> (12 pp., 12 ref., 12 graphs, 5 diag.)
  • Authors:
    • Faltinsen, O M
  • Publication Date: 1983

Language

  • English

Subject/Index Terms

  • Subject Areas: Marine Transportation;

Filing Info

  • Accession Number: 00685759
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Aug 14 1995 12:00AM