Computation of the Second-Order Steady Forces Acting on a Surface Ship in an Oblique Wave.

Abstract

The numerical procedure of calculating the second-order steady forces is presented. The computer program is developed on the basis of Lin and Reed's theory(1976). Ship motion and diffraction potentials are required as input data for Kochin-function calculation. In order to avoid the irregular frequencies which are associated with Frank's close-fit method(1967), a modification which extends the source distribution onto the calm waterline inside of a body is made. For the diffraction problem, instead of a Helmholtz equation, a two dimensional Laplace's equation is used. Numerical computation for the head-sea case shows the same trend of experimental data throughout the frequency ranges but its magnitude is much larger than that of the experiment. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1981
Accession Number
ADA097898

Entities

People

  • David W Taylor
  • Yoon-Ho Kim

Tags

DTIC Thesaurus Topics

  • Computational Science
  • Computations
  • Computer Programs
  • Contour Integrals
  • Coordinate Systems
  • Engineering
  • Equations
  • Experimental Data
  • Fluid Mechanics
  • Geometry
  • Helmholtz Equations
  • Integral Equations
  • Integrals
  • Measurement
  • Polynomials
  • Pressure Distribution
  • Two Dimensional

Readers

  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Marine Hydrodynamics
  • Statistical inference.