在计算带通海减动结构浮式钻进生产储卸油装置（FDPSO）的垂荡阻尼系数时，由于通海孔尺寸比整体结构尺寸小很多，在数值分析时会出现网格划分复杂、计算量增加、计算结果存在较大误差等问题。本文提出用无通海孔FDPSO代替有通海孔FDPSO计算垂荡阻尼系数的研究思路，并通过理论推导和计算证明了这种思路的可行性。首先，利用基于三维势流理论的水动力计算软件Ansys-Aqwa，建立有通海孔FDPSO和无通海孔FDPSO结构模型，通过频域分析法，计算有通海孔和无通海孔FDPSO的等效垂荡质量（排水量与附加质量之和）。计算结果表明，同尺寸的有通海孔和无通海孔FDPSO的等效垂荡质量和固有周期相等，通过FDPSO运动理论可知，通海孔对分析FDPSO的垂荡阻尼系数的影响较小，可用无通海孔FDPSO代替有通海孔FDPSO来计算垂荡阻尼系数。以1∶77.8的缩尺比建立无通海孔FDPSO的缩尺模型，利用基于三维粘流理论的水动力计算软件STAR CCM+计算分析其垂荡自由衰减运动，根据自由衰减运动时历曲线计算其垂荡阻尼系数。
In the calculation of floating drilling production storage and unloading device with sea opening motion reduction structure When calculating the heave damping coefficient of (FDPSO), because the size of the sea hole is much smaller than the overall structure size, there will be some problems in the numerical analysis, such as complex meshing, increased amount of calculation, large errors in the calculation results, etc. in view of these problems, this paper puts forward the research idea of using FDPSO without sea hole instead of FDPSO with sea hole to calculate the heave damping coefficient, and through theoretical derivation and The calculation proves the feasibility of this idea. Firstly, the hydrodynamic calculation software Ansys-Aqwa based on three-dimensional potential flow theory is used to establish the structural models of FDPSO with sea hole and FDPSO without sea hole, the equivalent heave mass of FDPSO with and without sea holes is calculated (the sum of displacement and added mass). The calculation results show that the equivalent heave mass and natural period of FDPSO with and without sea holes of the same size are equal. According to the FDPSO motion theory, the sea hole has little influence on the analysis of the heave damping coefficient of FDPSO. The heave damping coefficient can be calculated by using the sea hole free FDPSO instead of the sea hole FDPSO. Then, the scale of 1:77.8 scale model of FDPSO without through sea hole is established, the heave free attenuation motion is calculated and analyzed by using the hydrodynamic calculation software STAR CCM+ based on three-dimensional viscous flow theory, and the heave damping coefficient is calculated according to the time history curve of free attenuation motion.
2023,45(11): 113-118 收稿日期：2022-04-23
DOI：10.3404/j.issn.1672-7619.2023.11.022
分类号：P751
作者简介：张博(1996-),男,硕士研究生,研究方向为船舶与海洋结构物水动力性能
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