典型外飘剖面有限水域入水砰击分析

Numerical investigation on the limited water entry of typical hull flare section

针对大外飘船艏结构的砰击压力特性,应用重叠网格法对结构入水砰击过程进行仿真研究.分别讨论了当外飘结构底部为尖底形或球鼻艏形时,结构质量、入水初速度和流域宽度对砰击压力特性和入水速度的影响.另外,分析了限制流域宽度带来的侧壁面效应对外飘结构发生入水砰击时的自由液面抬升、水下压力分布的影响,对外飘砰击压力预报以及船艏结构优化具有一定参考意义和价值.

In order to study the impact load characteristics of hull flare while entering water,overset mesh method was used to simulate the water entry process of flare.The effects of structure mass,initial inlet velocity and water width on impact pressure and inlet velocity were discussed while the bottom of hull flare was pointed bottom or bulbous bow.In addition,the influence of the side wall effect caused by limited water width on the rise of free liquid level and the distribution of underwater pressure were discussed,which could provide some reference for the prediction of slamming pressure the optimization of the bow structure.