基于RANS方程的桩式U-OWC装置波浪荷载分析  

Study on the wave loads on a pile-type U-OWC wave energy device based on RANS Equations

作　　者：姚宇[1,2] 张壮壮 许从昊 YAO Yu;ZHANG Zhuangzhuang;XU Conghao(School of Hydraulic and Environmental Engineering,Changsha University of Science&Technology,Changsha 410114,China;Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province,Changsha 410114,China)

机构地区：[1]长沙理工大学水利与环境工程学院,湖南长沙410114 [2]水沙科学与水灾害防止湖南省重点实验室,湖南长沙410114

出　　处：《海洋工程》2023年第2期93-106,共14页The Ocean Engineering

基　　金：国家自然科学基金资助项目(52001031)。

摘　　要：使用OpenFOAM建立基于雷诺时均N-S方程和SST k-ω湍流模型的三维数值水槽,对桩式U-OWC装置在不同周期和波高的正向入射规则波作用下的受力情况进行分析。首先将数模结果与物理试验结果进行对比验证校核,然后通过数值模拟对装置的受力情况进行了分析,分别研究了作用在装置上作用力和倾覆力矩特点,装置上作用力和倾覆力矩随周期和波高的变化情况,以及装置稳定性极小状态。研究表明,装置所受到波向力、垂向力相比侧向力数值较大,对倾覆力矩起决定性作用。对装置上作用力和倾覆力矩进行无量纲分析,进一步发现在测试工况范围内,装置所受到的3个方向作用力中侧向力随周期变化不明显,明确了装置前的波浪爬高对装置波浪荷载和力矩的影响,并针对U-OWC模型特点和具体工况应用一个波浪爬高经验公式,获得了较好效果。A three-dimensional numerical flume based on Reynolds-Averaged Navier-Stokes equations and the k‐ωSST turbulence model is established using OpenFOAM to analyze the forces on the piled U-OWC device under the action of forward-incident regular waves of different periods and wave heights.The numerical wave flume is first validated against laboratory experimental results,before being applied to the study of wave loads.The temporal characteristics of the wave force and wave-induced overtopping moments acting on the U-OWC device are studied,and the critical mode of the structure stability is identified.The results show that the wave force in line with the wave transmission dominates over the wave forces acting on the vertical and lateral directions,thus plays a dominating role in the generation of overtopping moments.Dimensionless analysis of the results has also shown that the wave forces on the lateral directions are not very sensitive to incident wave period,and the influence of wave runup height in front of the device on the wave load and overturning moment of the device is characterized.An existing empirical formula for wave runup is applied to the characteristics of the U-OWC model under specific working conditions with favorable results.

关 键 词：桩式U-OWC 波浪荷载 倾覆力矩 规则波 无量纲分析 

分 类 号：P751[交通运输工程—港口、海岸及近海工程]