排灌机械工程学报
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排灌机械工程学报  2014, Vol. 32 Issue (1): 29-32    DOI: 10.3969/j.issn.1674-8530.13.0049
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V形浮式防波堤的动压力特性
丁宁1,2, 余建星1, 侯佳佳1,3
1.天津大学水利工程仿真与安全国家重点实验室, 天津 300072; 2.军事交通运输研究所, 天津 300161; 3.天津新港船舶重工有限责任公司, 天津 300456
Characteristics of dynamic pressure on floating V-shaped breakwater
Ding Ning1,2, Yu Jianxing1, Hou Jiajia1,3
1.State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China; 2.Institute of Military Transportation, Tianjin 300161, China; 3.Tianjin Xingang Shipbuilding Heavy Industry Co. Ltd., Tianjin 300456, China
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摘要 针对V形浮式防波堤设计和结构分析中波浪力(矩)的确定问题,分析了在规则波作用下防波堤湿表面的动压力及幅值分布规律.基于三维线性频域势流理论并考虑绕射作用,利用边界元法通过计算有限水深格林函数,求解了防波堤周围流场的速度势,其中近场和远场格林函数分别采用积分形式和特征函数的展开形式进行计算,根据流场速度势由线性伯努利方程确定了动压力,沿防波堤湿表面数值计算了规则波作用下动压力及其幅值的分布.算例分析表明:在防波堤湿表面上,动压力沿长度方向成正弦振荡分布,峰-峰间距大致为入射波波长除以波浪传播方向与防波堤单臂夹角的余弦值,沿深度方向衰减较快,动压力极大值出现在自由面,约为2 kPa,极小值出现在湿表面底部,约为0.2 kPa,自由面附近的动压力是波浪力(矩)的主要成分.
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丁宁
余建星
侯佳佳
关键词V形浮式防波堤   动压力   势流   波浪力     
Abstract: In order to determine the wave force(or moment)in design and structure analysis of floa-ting V-shaped breakwater, the dynamic pressure distribution and its amplitude on the wet surface of breakwater was calculated and analyzed in a regular wave. Considering the diffraction effect, the velo-city potential around the breakwater was calculated based on the 3D linear potential flow theory in frequency domain by using boundary element method and 3D Green functions, which were solved by both integral method and eigenfunction expansion approach. The dynamic pressure was calculated by using the linear Bernoulli equation according to the velocity potential just obtained numerically. Moreover, the dynamic pressure and its amplitude on the wet surface were estimated in a regular wave. The results of an example indicate that the dynamic pressure distribution on the wet surface is sinusoidal longitudinally and attenuating downward vertically. The distance between the two nearest peaks of dyna-mic pressure is approximately equal to the quotient of incident wave length divided by the cosine of the angle between the incident wave direction and the breakwater. Besides, the maximums of dynamic pressure(about 2 kPa)are on the free surface, while the minimums(about 0.2 kPa)are in the bo-ttom of breakwater, thus the dynamic pressure near free surface plays a very important part in wave force(or moment)of floating V-shaped breakwater.
Key wordsV-shaped floating breakwater   dynamic pressure   potential flow   wave force   
收稿日期: 2013-01-24;
基金资助:

国家自然科学基金资助项目(51021004);上海交通大学海洋工程国家重点实验室研究基金资助项目(1104)

通讯作者: 丁宁(1982—),男,山东胶南人,工程师,博士研究生(n_ding@163.com),主要从事船舶环境载荷计算与可靠性研究.   
作者简介: 余建星(1958—),男,福建泉州人,教授,博士生导师(yjx2000@tju.edu.cn),主要从事大型工程结构可靠性分析与优化及工程风险管理研究.
引用本文:   
丁宁,,余建星等. V形浮式防波堤的动压力特性[J]. 排灌机械工程学报, 2014, 32(1): 29-32.
DING Ning-,,YU Jian-Xing- et al. Characteristics of dynamic pressure on floating V-shaped breakwater[J]. Journal of Drainage and Irrigation Machinery Engin, 2014, 32(1): 29-32.
 
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