三维阶梯海床上系泊浮体运动响应及所受系泊力的数值研究

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振动与冲击 ›› 2025, Vol. 44 ›› Issue (12) : 162-175.

振动理论与交叉研究

三维阶梯海床上系泊浮体运动响应及所受系泊力的数值研究

张龙飞，廖斌*，姚乐，陈善群

作者信息 +

Numerical study on motion responses and mooring forces of moored floating bodies on athree-dimensional stepped seabed

ZHANG Longfei,LIAO Bin*,YAO Le,CHEN Shanqun

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摘要

采用光滑粒子流体动力学（Smoothed Particle Hydrodynamics，SPH）方法结合MoorDyn动态系泊缆绳数值模型建立了研究波浪驱动下三维阶梯海床上系泊浮体运动响应及所受系泊力的计算模型。通过实验数据验证对比其适用性与精确度的基础上，系统研究了Keulegan–Carpenter数（KC数）、周期T、浮体之间间距d以及海床阶梯高度h对阶梯海床上游及下游系泊浮体（系泊浮体I和II）运动响应及所受系泊力的影响规律。结果表明：KC数对系泊浮体I和II的运动响应及所受系泊力均有一定的激励作用；随着T的增大，系泊浮体I和II运动响应相位均发生明显偏移，两浮体所受系泊力幅值有一定增大趋势； d对系泊浮体I和II运动响应的影响较小，不同d条件下两浮体所受系泊力幅值对应的相位出现明显偏移；随着h的增大，系泊浮体I的运动响应有一定程度的减弱而系泊浮体II的运动响应有一定程度的增强，两系泊浮体所受系泊力幅值呈现类似的趋势；去除系泊浮体I后，系泊浮体II运动响应有一定程度的增加。

Abstract

In this paper, by using the Smoothed Particle Hydrodynamics (SPH) method combined with the MoorDyn dynamic mooring cable numerical model, a computational model to study the motion responses and mooring forces of moored floating bodies on the three-dimensional stepped seabed under wave-driven conditions had been developed. We used the experimental data to verify and compare its applicability and accuracy. Further, the effects of the Kollagan-Carpenter number (KC number), the period T, the spacing between floating bodies d, and the seabed height h on the motion responses and mooring forces of the moored floating bodies which are located at the upstream and downstream of the stepped seabed (moored floating bodies I and II, respectively) are systematically investigated. It was found that the KC number has a motivational effect on the motion response and mooring forces of moored floating bodies I and II. As T increases, the motion response phases of moored floating bodies I and II are significantly shifted, and the amplitude of the mooring forces on the two floating bodies has a tendency to increase. The effect of d on the motion responses of moored floating bodies I and II is small, and the phases corresponding to the amplitude of the mooring forces on the two floating bodies under different d show significant shifts. As h increases, the motion response of the moored floating body I is weakened while the motion response of the moored body II is enhanced, and the amplitude of the mooring forces on the two moored floating bodies shows a similar trend. The removal of the moored floating body I resulted in intensification of the moored floating body II motion response.

导出引用

张龙飞, 廖斌, 姚乐, 陈善群. 三维阶梯海床上系泊浮体运动响应及所受系泊力的数值研究[J]. 振动与冲击, 2025, 44(12): 162-175

ZHANG Longfei, LIAO Bin, YAO Le, CHEN Shanqun. Numerical study on motion responses and mooring forces of moored floating bodies on athree-dimensional stepped seabed[J]. Journal of Vibration and Shock, 2025, 44(12): 162-175

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