不同垂荡抑制结构对圆筒型FPSO阻尼和运动性能的影响研究

Damping performance of anti-motion structures on cylindrical FPSO

设计和改进垂荡抑制结构是提升圆筒型浮式生产储卸油装置(FPSO)阻尼性能和改善运动情况的一种常用方法。该文利用自主开发的CFD求解器naoe-FOAM-SJTU,对具有带锯齿垂荡抑制结构的圆筒型FPSO进行了计算分析。通过静水自由衰减数值模拟与模型试验对比平台固有周期进行验证,结果表明,二者吻合良好,验证了本求解器对圆筒型FPSO问题进行模拟仿真的可行性。之后,对带有不同垂荡抑制结构的FPSO进行模拟,得到相应的固有周期和阻尼系数。通过分析垂荡抑制结构附近的涡量场与速度场,探索了抑制结构对平台泄涡的影响。结果表明,在垂荡抑制结构上设置锯齿会对阻尼性能和流场情况产生较大影响。

Designing and improving the anti-motion structures is a common method to improve the damping performance of the cylindrical floating production storage and offloading system(FPSO)and improve the movement.In this paper,the self-developed CFD solver naoe-FOAM-SJTU is used to calculate and analyze a cylindrical FPSO with a sawtooth anti-motion structure.It is verified by comparing the natural period of the static water free attenuation numerical experiment and the model test.The results show that the two are in good agreement,which verifies the feasibility of this solver to simulate the cylindrical FPSO problem.After that,the FPSO with different anti-motion structures are simulated,and the corresponding natural period and damping coefficient are obtained.By analyzing the vorticity field and ve locity field near anti-motion structures,the influence of structures on vortex shedding performance is explored.The results sho w that the installation of sawtooth on the anti-motion structure will have a greater impact on the damping performance and the fl ow field.