Force Measurements of the Flow Around Arrays of Three and Four Columns With Different Geometry Sections, Spacing Ratios, and Incidence Angles
Force Measurements of the Flow Around Arrays of Three and Four Columns With Different Geometry Sections, Spacing Ratios, and Incidence Angles
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DOI：
10.1115/1.4045212
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发表时间：
2020-04
影响因子：
1.6
通讯作者：
Rodolfo T. Gonçalves;S. Hirabayashi;G. Vaz;Hideyuki Suzuki
中科院分区：
文献类型：
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作者：
Rodolfo T. Gonçalves;S. Hirabayashi;G. Vaz;Hideyuki Suzuki
在拖曳槽中进行了低长径比（H/L = 1.5）的三柱和四柱固定阵列穿透自由水面的流动实验。这些柱的数量对应于典型的多柱海上系统，如半潜式平台（SS）、张力腿平台（TLPs）和浮动海上风力涡轮机（FOWTs）。研究了三个参数：柱中心之间的间距比（从两个到四个特征长度）、电流入射角和柱截面几何形状（圆形、方形和菱形）。实验的雷诺数为100,000。用三自由度测力元件测量了每根柱上的力，并分别给出了每根柱和整个系统的升力和阻力结果。利用有限长度测量信号的统计不确定性分析程序评估了力的平均值和标准差的结果。这种方法不仅评估了实验数据的质量，而且促进了数值工具的验证。因此，当前工作的目标是多方面的：更好地了解相对位置、形状和入射角对多柱海上结构的影响；为计算流体动力学（CFD）验证创建可靠的数据库；并为自由移动多柱海上系统的流致运动（FIMs）的实验和数值工作做准备。
An experimental campaign for the flow around a stationary array of three and four columns with low aspect ratio, H/L = 1.5, piercing the water free surface, was carried out in a towing tank. These numbers of columns correspond to typical multi-column offshore systems, such as semi-submersibles (SS), tension leg platforms (TLPs), and floating offshore wind turbines (FOWTs). Three parameters were investigated: the spacing ratio between column centers (from two up to four characteristic lengths), current incidence angles, and column section geometries (circular, square, and diamond). The Reynolds number of the experiments was 100,000. Forces were measured in each column using a three degrees-of-freedom load cell, and results of lift and drag forces were presented for each column separately and the whole system. The results of mean and standard deviation of forces were assessed using a statistical uncertainty analysis procedure for finite length measurements’ signals. This methodology not only assesses the quality of the experimental data but also facilitates validation of numerical tools. The objectives of the current work were therefore manifold: to better understand the influence of the relative position, shape, and incidence angle on multi-column offshore structures; to create a reliable database for computational fluid dynamics (CFD) validation; and to prepare the path to flow-induced motions (FIMs) experimental and numerical work of free-moving multi-column offshore systems.