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Effects of the position of pipe-type appendages on the flow induced motions, energy transformation, and drag force of a TLP
Applied Ocean Research ( IF 4.3 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.apor.2020.102464
Chenling Tian , Mingyue Liu , Longfei Xiao , Rodolfo T. Goncalves , Wenhui Xie , Shisheng Wang

Abstract Flow-induced motions (FIM) can cause fatigue damage to the mooring and riser systems of deepwater offshore structures, especially for cylindrical platforms, such as Tension Leg Platform(TLP). Previous experimental and numerical studies have showed conservative FIM prediction compared to the field measurements, due to many significant factors such as the Reynolds number, the nonuniformity of the incident current, the unsteadiness of the current velocity and platform heading, the coupled current and wave presence. Besides, the appendages covering the hull surface of platforms also played an important role in the smaller FIM responses of the field measurements. In order to specifically examine the influence of position of pipe-type appendages, this paper experimentally investigated the FIM of a TLP with different positions of appendages at 0°-incidence and compared the FIM responses, energy transformation, and average drag coefficients with those of the bare hull. An air-bearing system and a horizontal mooring system were employed to provide vertical pretension and horizontal restoring forces, respectively, and to ensure the low-friction horizontal motions. The results showed that for 0°-incidence whatever the appendages position, the transverse and yaw motions were all mitigated and the TLP with appendages-45° was the most effective configuration, with a reduction of 55% for the transverse motion and 52% for the yaw motion, mainly owing to the changes of the boundary layer separation point. However, the analysis of energy transformation indicated the development trend of the galloping phenomenon for the TLP with appendages-45°. In addition, the influence of the FIM behavior on the drag force of the TLP at 0° 22.5° and 45°-incidences was also studied. It showed that the FIM could contribute to larger drag force and the increase of drag force is the most significant at 0°-incidence, with a value of around 39%.

中文翻译:

管型附件的位置对 TLP 的流动诱导运动、能量转换和阻力的影响

摘要 流动引起的运动(FIM)会导致深水海上结构的系泊和立管系统疲劳损坏,特别是对于圆柱形平台,如张力腿平台(TLP)。由于许多重要因素,例如雷诺数、入射电流的不均匀性、电流速度和平台航向的不稳定性、耦合电流和波浪的存在,先前的实验和数值研究表明,与现场测量相比,FIM 预测较为保守。 . 此外,覆盖平台船体表面的附属物在现场测量的较小 FIM 响应中也发挥了重要作用。为了具体考察管型附件位置的影响,本文通过实验研究了在 0° 入射角下具有不同附件位置的 TLP 的 FIM,并将 FIM 响应、能量转换和平均阻力系数与裸船体的 FIM 响应进行了比较。采用空气轴承系统和水平系泊系统分别提供垂直预紧力和水平恢复力,并确保低摩擦水平运动。结果表明,对于 0°入射角,无论附件位置如何,横向和偏航运动都得到缓解,带有附件 45°的 TLP 是最有效的配置,横向运动减少 55%,横向运动减少 52%。偏航运动,主要是由于边界层分离点的变化。然而,能量转换分析表明了45°附件TLP飞驰现象的发展趋势。此外,还研究了 FIM 行为对 0° 22.5° 和 45° 入射角下 TLP 阻力的影响。结果表明,FIM 可以产生更大的阻力,阻力的增加在 0°入射时最为显着,约为 39%。
更新日期:2021-01-01
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