Accession Number : ADA134456

Title :   Computation of Surface Ship Wave Profiles with Thin Ship Theory.

Descriptive Note : Final rept.,


Personal Author(s) : Hong,Young S

PDF Url : ADA134456

Report Date : Sep 1983

Pagination or Media Count : 28

Abstract : The analytical method for computing the free-surface wave height of a ship is one of the most important tasks in naval hydrodynamics. The steady ship wave profile is usually linearly superimposed on other free-surface wave profiles. In the computational of the relative bow motion of a naval ship in waves, it is necessary to know the wave height due to the steady forward motion before computing the transfer functions. The analytical study of deck wetness also requires the knowledge of the wave profiles in steady motion. The present computational method has been developed through an application of Michell's thin ship theory. This theory is first-order and linearized. Even though there is some limitation in the application of thin ship theory to ships with large block coefficients and with blunt bows, the results of this theory are reliable for various hull forms as concluded in another document. Two hull forms have been chosen for the numerical computations in this presentation: a Wigley hull and an SL7 container ship. The numerical results for the Wigley hull, which is a mathematical hull form show satisfactory agreement with the experiment. However, the numerical results for the SL7 are not satisfactory. There are some discrepancies near the bow region for even small Froude numbers.

Descriptors :   *Numerical methods and procedures, *Computations, *Surface waves, *Ship hulls, Naval vessels, Steady state, Motion, Hydrodynamics, Ship bows, Transfer functions, Ship sterns, Mathematical prediction

Subject Categories : Physical and Dynamic Oceanography
      Numerical Mathematics
      Marine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE