多体浮式海工结构物间隙内的波浪共振特性研究
巩绍东,
王心玉,
刘勇
中国海洋大学工程学院,青岛 266404
基金项目:
国家自然科学基金;大连理工大学海岸;国家重点实验室开放基金;山东省自然科学基金青年基金项目
详细信息
中图分类号:
TV92(水利工程);U656.6(港口工程)
Study on the Wave Resonance Characteristics in the Narrow Gap of Multiple Floating Structures
摘要
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摘要
摘要:
在特定频率的波浪作用下,毗连的多个浮式海工结构物间隙内的水体会发生窄缝共振现象.论文基于开源软件OpenFOAM,对波浪作用下多体浮式海工结构物间隙内的波浪共振特性进行了直接数值模拟(DNS)研究,并开展了相应的模型试验.对比共振发生时DNS得到的结果与水下粒子图像测速(PIV)测量得到的波面和速度矢量场结果,验证了数值模型的合理性.研究了波浪参数(波高和波数)和结构参数(浮箱底角型式和间隙宽度)对双浮箱间隙内自由液面响应幅度和共振频率的影响,并分析了间隙内水体能量的演化过程和浮箱的受力特性.研究表明,圆底角浮箱的量纲一共振波高Hg-max/H是矩形浮箱两倍,共振频率会随间隙宽度的变化而发生显著改变.最后,对比了波浪共振发生时不同底角型式浮箱周围复杂涡结构的特征差异,提出了一种抑制双浮体海工结构间隙内波浪共振的建议方案,可为多体浮式海工结构物的设计提供了参考.
关键词:
多体浮式海工结构物
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波浪共振
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直接数值模拟
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PIV
Abstract:
Wave resonance occurs in the narrow gap of multiple floating structures(MFSs)under specific wave frequencies.In this paper,a direct numerical simulation(DNS)study on the wave resonance of MFSs is conducted based on OpenFOAM,and relevant physical model tests are carried out.Underwater particle image velocimetry(PIV)results under the wave resonance condition are used to validate the DNS model.The effects of wave parameters(wave height and wave number)and structural parameters(corner shape and gap width)on the wave resonant response in the gap of the two floating boxes are investigated through examples analysis.The fluid energy evolution and the force on two floating boxes are also discussed.The results show that the dimensionless resonant wave height Hg-max/H of two ROUC floating boxes is twice as high as that of REC structures.The resonance frequency changes significantly with the gap width.Finally,the differences in the characteristics of the complex fluid field for different corner shapes of two floating boxes are illustrated under the wave resonant condition,and subsequently,a scheme for suppressing the wave resonance in the gap of the two floating offshore structures is suggested,which provides a scientific reference for the optimal design of MFSs.
Key words:
multiple floating offshore structures
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wave resonance
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direct numerical simulation
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PIV
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