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首页> 外文期刊>Ocean Engineering >Experimental study of the column shape and the roughness effects on the vortex-induced motions of deep-draft semi-submersible platforms
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Experimental study of the column shape and the roughness effects on the vortex-induced motions of deep-draft semi-submersible platforms

机译：深浮式半潜式平台的圆柱形状和粗糙度对涡激运动影响的实验研究

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摘要

Experiments regarding the VIM of SS platforms with four columns were carried out to investigate the effects of the surface roughness and the column shape. Two different geometry of columns were experimented: rounded-square and circular-cross sections. Each model had the same arrangement of four pontoons in a closed configuration. The range of reduced velocity was from 4 up to 25 covering Reynolds numbers from 7.000 to 80.000. Three angles of incidences for each model were tested, namely 0, 22.5 and 45. For each model, three different levels of roughness were tested. Regarding roughness effects the results seem to confirm two aspects: the important role played by the separation point near the rounded corners of the rounded-square columns and the roughness effect on the boundary layers of the circular columns. Regarding the effect of the column shape, the results indicated that the heading effects on the VIM of SS strongly depend on the column shape. The characteristic motion periods upheld the resonance behavior for the motions in the transverse direction and yaw motions for the lock-in range. Heave, roll and yaw motions did not impact the VIM behavior in the horizontal plane, and their amplitudes were not considered relevant.
机译：进行了关于具有四个柱子的SS平台的VIM的实验，以研究表面粗糙度和柱子形状的影响。实验了两种不同的圆柱几何形状：圆角正方形和圆形横截面。每个模型在封闭配置中具有四个浮筒的相同布置。降低的速度范围是从4到25，覆盖了从7.000到80.000的雷诺数。测试了每个模型的三个入射角，即0、22.5和45。对于每个模型，测试了三个不同级别的粗糙度。关于粗糙度影响，结果似乎证实了两个方面：圆角柱的圆角附近的分离点所起的重要作用以及圆柱的边界层上的粗糙度影响。关于圆柱形状的影响，结果表明，航向对SS VIM的影响很大程度上取决于圆柱形状。特征运动周期维持横向运动的共振行为和锁定范围的偏航运动。纵摇，横摇和横摆运动不会影响水平面上的VIM行为，并且它们的幅度也被认为不相关。

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