Accession Number : AD0738881

Title :   A Rational Strip Theory of Ship Motions: Part II.

Descriptive Note : Interim technical rept.,

Corporate Author : MICHIGAN UNIV ANN ARBOR DEPT OF NAVAL ARCHITECTURE AND MARINE ENGINEERING

Personal Author(s) : Faltinsen,Odd M.

Report Date : DEC 1971

Pagination or Media Count : 147

Abstract : The exact ideal-fluid boundary-value problem is formulated for the diffraction of head-sea regular waves by a restrained ship. The problem is then simplified by applying four restrictions. The problem is solved by using matched asymptotic expansions. The result shows that the wave is attenuated as it propagates along the ship. The result is not expected to be valid near the bow or stern of the ship. The pressure distribution and force distribution along a ship model with circular cross-sections were calculated. The total force on the ship was compared with the value predicted by the Khaskind relation. The agreement is good. The experimental and theoretical pressure distribution along a prolate spheroid was compared. The predicted attenuation of the peak pressure is very well confirmed by the experiments. In addition, theory and experiment agree that the peak pressure near the ship generally leads the Froude-Kriloff pressure peak by 45 degrees. (Author)

Descriptors :   (*SHIPS, *HYDRODYNAMICS), EQUATIONS OF MOTION, THEORY, BOUNDARY VALUE PROBLEMS, OCEAN WAVES, SHIP HULLS, PRESSURE, DISTRIBUTION

Subject Categories : Marine Engineering
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE