畸形波中甲板上浪船舶的运动与砰击响应研究

Motion and Slamming Response of Hull to Green Water in Freaking Waves

畸形波是海洋中一种极端的、随机发生的强非线性波,对船舶与海洋工程结构的安全具有很大威胁。论文在建立的三维数值水槽中实现了基于相速度法的畸形波在预定时间和空间的聚焦。研究了简易固定浮体的甲板上浪现象,通过与Greco物理模型试验的对比,验证了数值模拟方法的可行性和准确性。在此基础上,研究了畸形波作用下的甲板上浪现象,包括第一次“溃坝式”上浪和第二次“卷波式”上浪,分析这两次上浪的机理和冲击形式,并对上浪过程中船体的运动响应、上浪水体变化规律和作用于船体的压力进行了讨论。

Freak waves are extreme,random and strongly nonlinear waves in the ocean,extremely threatening to ships and marine structures.In order to investigate the green water phenomenon caused by freak waves,a three-dimensional numerical flume was built,and freak waves based on the phase velocity method are focused on both predetermined time and space.By comparing the numerical results with experimental data,feasibility and accuracy of the numerical method are verified.Then green water phenomenon caused by freak waves was studied,including the first type of green water similar to dam-breaking and the second type of green water similar to wave-plunging.Mechanism and impact forms of these two green water types were compared and analyzed.Response of ship motion,process of green water and slamming pressure was discussed.