Wave Pressure Acting on V-Shaped Floating Breakwater in Random Seas  

作　　者：YU Yang DING Ning LIN Jie HOU Jiajia 

机构地区：[1]Institute of Mechanics,Chinese Academy of Sciences [2]State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University [3]Institute of Military Transportation [4]Sino-European Institute of Aviation Engineering,Civil Aviation University of China [5]Business Department Tianjin Xingang Shipbuilding Heavy Industry Co.,Ltd

出　　处：《Journal of Ocean University of China》2015年第6期975-981,共7页中国海洋大学学报（英文版）

基　　金：supported by the Science Fund for Creative Research Groups of the National Natural Science Foundation of China(Grant no.51021004);the Research Fund of State Key Laboratory in Ocean Engineering of Shanghai Jiaotong University(Grant no.1104);the Scientific Research Foundation of Civil Aviation University of China(Grant no.09QD08X)

摘　　要：Wave pressure on the wet surface of a V-shaped floating breakwater in random seas is investigated. Considering the diffraction effect, the unit velocity potential caused by the single regular waves around the breakwater is solved using the finite-depth Green function and boundary element method, in which the Green function is solved by integral method. The Response-Amplitude Operator(RAO) of wave pressure is acquired according to the Longuet-Higgins' wave model and the linear Bernoulli equation. Furthermore, the wave pressure's response spectrum is calculated according to the wave spectrum by discretizing the frequency domain. The wave pressure's characteristic value corresponding to certain cumulative probability is determined according to the Rayleigh distribution of wave heights. The numerical results and field test results are compared, which indicates that the wave pressure calculated in random seas agrees with that of field measurements. It is found that the bigger angle between legs will cause the bigger pressure response, while the increase in leg length does not influence the pressure significantly. The pressure at the side of head sea is larger than that of back waves. When the incident wave angle changes from 0? to 90?, the pressure at the side of back waves decreases clearly, while at the side of head sea, the situation is more complicated and there seems no obvious tendency. The concentration of wave energy around low frequency(long wavelength) will induce bigger wave pressure, and more attention should be paid to this situation for the structure safety.Wave pressure on the wet surface of a V-shaped floating breakwater in random seas is investigated. Considering the diffraction effect, the unit velocity potential caused by the single regular waves around the breakwater is solved using the finite-depth Green function and boundary element method, in which the Green function is solved by integral method. The Response-Amplitude Operator (RAO) of wave pressure is acquired according to the Longuet-Higgins' wave model and the linear Bernoulli equation. Furthermore, the wave pressure's response spectrum is calculated according to the wave spectrum by discretizing the frequency domain. The wave pressure's characteristic value corresponding to certain cumulative probability is determined according to the Rayleigh distribution of wave heights. The numerical results and field test results are compared, which indicates that the wave pressure calculated in random seas agrees with that of field measurements. It is found that the bigger angle between legs will cause the bigger pressure response, while the increase in leg length does not influence the pressure significantly. The pressure at the side of head sea is larger than that of back waves. When the incident wave angle changes from 0A degrees to 90A degrees, the pressure at the side of back waves decreases clearly, while at the side of head sea, the situation is more complicated and there seems no obvious tendency. The concentration of wave energy around low frequency (long wavelength) will induce bigger wave pressure, and more attention should be paid to this situation for the structure safety.

关 键 词：RANDOM SEAS V-SHAPED FLOATING BREAKWATER wave pressure boundary element method spectrum analysis 

分 类 号：U656.2[交通运输工程—港口、海岸及近海工程]