Numerical Simulations on Ship Bow Free Falling Impacts on Still Water

• Main Authors: NGUYEN THI DOAN, 阮氏緣
• Other Authors: Jr-Ping Wang
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/98367989715247873632

碩士 === 國立高雄海洋科技大學 === 造船及海洋工程研究所 === 103 === In order to improve the efficiency of operations, modern container vessels are gradually toward larger shapes. Bigger bow flare shapes are formed consequently. Big bow flare will cause larger impact load. In this study, three 2-D bow sections were selected for impact pressure analysis. This study used the commercial computational fluid dynamic code STAR-CCM+ for ship bow free falling impact simulation. The STAR CCM+ implements the finite volume type discretization in the governing equations and the volume-of-fluid method in the free surface part. We compare the impact pressure on the hull, flow patterns, accelerations, etc. with existing experimenter data to ensure the accuracy of the code. The results of this study show: the impact pressure on the hull is positive correlate to the falling velocity magnitude; maximum pressure occurs near the point where the hull curvature changed; increased ship hull flare angle increases the impact force. Calculated results are higher than the experimental data. However they are still within the same range of order and changing trend. Computational results can provide reasonable reference.