波浪作用下月池开口对钻井船水动力的影响

结合模型试验与频域数值计算结果,分析月池对船体水动力性能的影响,并对模型试验与数值计算的RAO、月池敞开和封闭的RAO、运动统计结果和附加质量系数进行对比。分析结果显示:月池开口会增大横摇和垂荡运动幅值,并且减小船体的横摇固有周期;当外部激励使月池发生共振时,月池内流体产生的附加质量会发生剧烈变化。因此,月池开口对船体水动力性能会产生一定负面影响,作业时,应当避免发生共振现象。

Research on Influence of Moon Pool on Hydrodynamic Performance of Drillship in Wave Conditions

A drillship with moonpool have different hydrodynamic performance. Resonance condition of water oscillation in moonpool cause a variety of risks for drillship. In this paper, model experiment and numerical calculation are used to study the influence of moonpool on hydrodynamic performance of drillship. HydroD is one kind of hydrodynamic performance software, which is used to calculate the RAO, additional mass of drillship with or without moon pools. Compare the results of numerical and the model experiment. The research found that moonpool can increase the amplitude of the roll and heave and the natural period of roll. The additional mass of drillship change drastically in the resonance condition. It is obvious that moonpool has a negative effect on the hydrodynamic performance of drillship. Resonance condition in moonpool must be avoided when operation.