| 波浪作用下刚性框架浮体及其锚绳运动数值模拟精度分析 |
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| 引用本文： | 桂福坤,左孝,潘昀,冯德军,张健.波浪作用下刚性框架浮体及其锚绳运动数值模拟精度分析[J].海洋工程,2018,36(4):1-10. |
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| 作者姓名： | 桂福坤 左孝 潘昀 冯德军 张健 |
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| 作者单位： | 浙江海洋大学国家海洋设施养殖工程技术研究中心 |
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| 基金项目： | 国家海洋局公益专项（201505025-2）；浙江省自然科学基金项目（LQ18E090005）；舟山市海洋专项（2017C41001） |
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| 摘 要： | 由小尺度刚性杆件构成的复杂结构近年来多用于海洋平台建设和海洋监测浮标制作以及海洋增养殖人工浮鱼礁的设计。采用有限单元法和集中质量点法建立波浪作用下刚性框架浮体及其锚绳运动数值模型,探讨空间单元划分、时间离散步长、数据保存格式对刚性框架浮体和柔性锚绳运动模拟精度的影响,分别给出此三者之间的匹配关系。研究结果表明:框架浮体的单元划分可依据是否出水给定,单元的划分比建议取0.05;锚绳的单元划分与其上端连接的浮体浮力有关,当锚绳的拉力主要由上端浮体浮力产生时锚绳单元的划分影响较小,当锚绳的拉力主要由波浪力产生时锚绳单元的划分比建议取0.02;空间单元划分与时间离散步长存在匹配关系,通过减小时间步长来追求数值模拟精度时必须同时考虑保存运动物理量截断误差的影响。
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| 关 键 词： | 刚性浮体 锚绳运动 波浪作用 截断误差 单元划分比 时间步长 |
The effect on numerical precision for simulating frame floating structure tethered by a mooring cable in waves |
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| GUI Fukun,ZUO Xiao,PAN Yun,FENG Dejun and ZHANG Jian.The effect on numerical precision for simulating frame floating structure tethered by a mooring cable in waves[J].Ocean Engineering,2018,36(4):1-10. |
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| Authors: | GUI Fukun ZUO Xiao PAN Yun FENG Dejun and ZHANG Jian |
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| Institution: | National Engineering Research Center for Marine Aquaculture, Zhejiang Ocean University, Zhoushan 316022, China,National Engineering Research Center for Marine Aquaculture, Zhejiang Ocean University, Zhoushan 316022, China,National Engineering Research Center for Marine Aquaculture, Zhejiang Ocean University, Zhoushan 316022, China,National Engineering Research Center for Marine Aquaculture, Zhejiang Ocean University, Zhoushan 316022, China and National Engineering Research Center for Marine Aquaculture, Zhejiang Ocean University, Zhoushan 316022, China |
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| Abstract: | Small scale rigid bars are increasingly used ocean platforms, ocean monitoring buoys and marine artificial floating reefs in recent years. Numerical modeling of a frame floating structure, tethered by a mooring cable, is developed for the dynamic simulation of the floating structures in waves. The effect of space elements division, time discretization and data saving format on simulation precision was explored. The results of the study show that the space division of frame floating body can be decided by whether it is out of water, and the recommended ratio of the division is 0.05. The space division of anchored rope is associated with floating buoyancy at the upper end. When the tension of the mooring cable is mainly produced by the buoyancy of the upper floating body, the division of the mooring cable has less influence. Otherwise, when the tension of the mooring cable is mainly generated by the wave force, the recommended separation ratio of the mooring cable is 0.02. The division of space must match with the length of time discretization well. It is strongly suggested to consider the truncation error during the calculation process, although decreasing the length of time discretization could improve the numerical simulation accuracy. |
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| Keywords: | rigid floating body movement of mooring cable wave action truncation error ratio of division time step |
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