Computation of Surface Ship Wave Profiles with Thin Ship Theory.
DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD
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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 Michells 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.
- Physical and Dynamic Oceanography
- Numerical Mathematics
- Marine Engineering