钻井船月池区波面升高运动分析

Analysis of disturbed wave elevation in moonpool zone of drillship

以一艘深水钻井船为研究对象,基于三维势流理论分析钻井船月池区波面升高运动。利用AQWA软件对钻井船进行水动力计算,预报得到高海况和低海况下钻井船月池区波面升高运动结果。通过对钻井船月池开、闭两种情况下波面升高运动结果进行分析,发现月池结构的存在会显著改变波面升高运动的幅值,对不同浪向下月池区波面升高运动的结果进行对比发现:横浪状态,月池结构会导致波面升高运动幅值加大;迎浪状态,月池结构能够有效屏蔽波浪作用,减小月池区波面升高运动幅值。计算结果还表明,不规则波波陡和波长在高、低海况下对月池区波面升高运动也有很大影响。

In this paper, the disturbed wave elevation in the moonpool zone of a deepwater drillship is analyzed in frequency domain based on 3D potential flow theory. The hydrodynamic calculation of the drillship is conducted with software AQWA, and the disturbed wave elevations in the moonpool zone of the drillship in high seastate and low seastate are predicted. Through the analysis on the disturbed wave elevations in moonpool open state and closed state, it is found that the moonspool structure can obviously change the disturbed wave elevation amplitude;the wave direction can affect the disturbed wave elevation amplitude too;in broadside sea state, the amplitude increases, in head sea state, the amplitude decreases due to effective shielding by moonspool structure. The results also indicate that wave steepness and wave length of irregular wave have a great influence on the disturbed wave elevation.