三船体浮托作业水动力响应数值模拟

Numerical Simulation of Hydrodynamic Response for Three Hulls Floatover

针对退役的大型海洋平台拆除问题,现提出一种双船起重系统(TML)将平台上部模块整体浮托并驳运到运输船上。为研究该方法的可靠性,对三船系统小间隙并靠时的波浪力和RAO进行了数值模拟,分析了不同的环境情况下三船体耦合作用时的水动力参数变化特性。结果显示三船系统对海况条件的变化比较敏感。波高增加后,船舶之间的相对运动的有义值也显著增加;船舶之间的相对运动在不同浪向角下呈现不同的数值。实际作业中应考虑避开运动响应较大时的波浪频率和环境载荷方向。

A twin marine lifter system(TML)is proposed to float over the upper modules of the platform and lightering onto a transport vessel for the issue of dismantling retired large offshore platforms.In order to study the reliability of this method,the wave force and RAO of the three ship system when they are alongside with small gaps are numerically simulated.The results show that the three ship system is sensitive to changes in sea conditions.The significant value of relative motion between ships also significantly increases after the wave height increases.The relative motion between ships exhibits different values at different wave angles.In practical operations,it should be considered to avoid wave frequencies and environmental load directions when the motion response is large.