The Influence of Above-Water Bow Flare Shape on the Added Resistance and Relative Wave Elevation for the Ship Advancing in Longitudinal Reqular Waves

• Main Authors: Kuo-TungHuang, 黃國棟
• Other Authors: Ming-Chung Fang
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/10099027238142594954

碩士 === 國立成功大學 === 系統及船舶機電工程學系碩博士班 === 98 === The main purpose of the paper is to investigate the effect of the bow flare on the added resistance and relative elevation for the ship advancing in longitudinal reqular waves. In the present paper, the strip theory and source distribution method are applied to solve the corresponding boundary conditions and analyze the nonlinear motions and the nonlinear hydrodynamic forces, i.e. the mean added resistance. Because the general frequency domain method cannot calculate the instantaneous ship motion and nonlinear forces, the time domain simulation technique based on the 4th Runge-Kutta method is therefore applied here to solve the instantaneous mean added resistance for a ship with different bow flare respect to the different draft. In order to find the instant hull shape below the free surface, the B-spline theory is also applied to calculate the required input source data points for the source distribution method at any instant time with respect to the different draft. The relative elevations near the bow flare are also investigated for discussions. The present results shows that the larger the bow flare, the larger the mean added resistance and the smaller the relative wave elevation, especially for large wave amplitudes.