Modelling of multi-bodies in close proximity under water waves—Fluid forces on floating bodies
Modelling of multi-bodies in close proximity under water waves—Fluid forces on floating bodies
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DOI：
10.1016/j.oceaneng.2011.06.008
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发表时间：
2011-09
影响因子：
5
通讯作者：
Lin Lu;B. Teng;Liang Sun;Bing Chen
中科院分区：
文献类型：
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作者：
Lin Lu;B. Teng;Liang Sun;Bing Chen
本文基于粘性流体模型和势流模型，研究了近距离多浮体波浪力与入射波频率、间隙宽度、浮体吃水深度、浮体宽度和浮体数量的关系。利用已有的窄缝内流体振荡实验数据对数值模型进行了验证。数值研究表明，水平和垂直波浪力的大幅响应出现在流体共振频率附近。对流势流模型被观察到非物理地高估了流体共振时波浪力的大小。通过引入适当阻尼系数μ∈[0.4，0.5]的人工阻尼项，势流模型可以和粘性流体模型一样工作，这与我们以前工作中用于间隙共振波高预测的阻尼系数是一致的。此外，粘性流体模型的数值结果表明，水平波浪力与单个浮体两侧的水位差密切相关，作用在浮体上的总水平波浪力一般小于作用在每个浮体上的波浪力之和。
This work presents two-dimensional numerical results of the dependence of wave forces of multiple floating bodies in close proximity on the incident wave frequency, gap width, body draft, body breadth and body number based on both viscous fluid and potential flow models. The numerical models were validated by the available experimental data of fluid oscillation in narrow gaps. Numerical investigations show that the large amplitude responses of horizontal and vertical wave forces appear around the fluid resonant frequencies. The convectional potential flow model is observed to un-physically overestimate the magnitudes of wave forces as the fluid resonance takes place. By introducing artificial damping term with appropriate damping coefficients μ∈[0.4, 0.5], the potential flow model may work as well as the viscous fluid model, which agree with the damping coefficients used in our previous work for the predication of wave height under gap resonance. In addition, the numerical results of viscous fluid model suggest that the horizontal wave force is highly dependent on the water level difference between the opposite sides of an individual body and the overall horizontal wave force on the floating system is generally smaller than the summation of wave force on each body.