Motion response prediction by hybrid panel-stick models for a semi-submersible with bracings
Motion response prediction by hybrid panel-stick models for a semi-submersible with bracings
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DOI：
10.1007/s00773-016-0390-1
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发表时间：
2016-05
影响因子：
2.6
通讯作者：
Yingyi Liu;Changhong Hu;M. Sueyoshi;H. Iwashita;M. Kashiwagi
中科院分区：
文献类型：
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作者：
Yingyi Liu;Changhong Hu;M. Sueyoshi;H. Iwashita;M. Kashiwagi
当结构构件之间的水动力相互作用发生在短波中时，通常需要进行绕射辐射分析。对于在浮式平台固有频率附近起重要作用的支撑或小圆柱形构件，应特别注意粘性阻尼的影响。因此，通过标准衍射-辐射法和Morison公式的结合，建立了两个混合的板-杆模型，分别考虑了小杆件的影响。流体速度直接由面元模型得到。粘性流体力通过杆模型计算各个构件。作为数值算例，分析了一个半潜式平台，该平台具有多个精细圆柱结构，被设计为多个风力发电机组的浮式基础。结果表明，粘性力对浮体的水动力行为有显著影响，所提出的混合模型可以成功地考虑粘性力的影响。
A diffraction-radiation analysis is usually required when the hydrodynamic interactions between structural members occur in short waves. For bracings or small cylindrical members, which play important roles in the vicinity of the natural frequency of a floating platform, special care should be taken into account for the effect of viscous damping. Two hybrid panel-stick models are, therefore, developed, through the combination of the standard diffraction-radiation method and the Morison’s formulae, considering the effect of small members differently. The fluid velocity is obtained directly by the panel model. The viscous fluid force is calculated for individual members by the stick model. A semi-submersible type platform with a number of fine cylindrical structures, which is designed as a floating foundation for multiple wind turbines, is analyzed as a numerical example. The results show that viscous force has significant influence on the hydrodynamic behavior of the floating body and can successfully be considered by the proposed hybrid models.