钻井船具有与海水相连的月池，在外界波浪作用下，月池内的流体表现出明显的非线性运动特性。本文基于粘性流体理论，运用动网格技术，耦合求解运动响应方程，建立一套钻井船运动响应的数值预报方法。通过实尺度计算，模拟了不同波参数下钻井船在约束和自由模式下月池内流体运动，定量分析了3种不同类型月池在接近共振周期时内水体的非线性运动特性。研究表明，阶梯式月池的活塞运动容易导致“伪晃荡”现象；对阶梯型月池随边削斜处理可以有效减小船体纵摇；与约束模式相比，自由状态下船体月池内流体运动更为剧烈，且导边处更易出现上浪现象。研究成果对指导钻井船月池结构型式设计具有重要意义。
Drillships have moonpools that are connected to seawater, and under the influence of external waves, the fluid inside the moonpool exhibits significant nonlinear motion characteristics. Based on viscous fluid theory, this study employs dynamic mesh technology and couples it with motion response equations to establish a numerical prediction method for drillship motion response. Through full-scale simulations, the study investigates the fluid motion inside the moonpool under constrained and free modes for different wave parameters, quantitatively analyzing the nonlinear motion characteristics of three different types of moonpools near their resonance periods. The results indicate that the piston motion of a stepped moonpool can easily lead to a "pseudo-sloshing" phenomenon; chamfering the following edge of a stepped moonpool can effectively reduce the ship's pitch motion; compared to the constrained mode, the fluid motion inside the moonpool is more intense in the free mode, with wave overtopping more likely to occur at the guide edge. These findings are of great significance for guiding the structural design of drillship moonpools.
2025,47(20): 51-56 收稿日期：2025-1-3
DOI：10.3404/j.issn.1672-7649.2025.20.008
分类号：U661.1
作者简介：宋学斌(1966-),男,正高级引航员,研究方向为船舶操纵运动
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