Abstract A rectangular barge consisting of multiple oscillating water columns (OWCs) is considered in this paper, hereinafter referred to as a multi–OWC platform. Each OWC chamber is enclosed by two partially submerged vertical walls and the deck of the platform. An incident wave produces oscillation of the water column in each OWC chamber and hence air is pumped by the internal water surface to flow through a Wells turbine installed at the chamber top. The effect of the turbine is characterised as a linear power take–off (PTO) system. A semi–analytical model based on linear potential flow theory and the eigen–function expansion method is developed to solve the wave radiation and diffraction problems of the multi–OWC platform. The hydrodynamic coefficients evaluated with direct and indirect methods of the model are shown to be in excellent agreement, and the energy conservation relationship of the multi–OWC platform is satisfied. The validated model is then applied to predict wave motion, dynamic air pressure, wave power extraction, and wave reflection and transmission coefficients of the multi–OWC platform. The effects of the PTO strategies, the number of chambers, the overall platform dimensions and the relative dimensions of adjacent chambers on wave power extraction and wave attenuation are investigated. A smaller–draft front wall and a larger–draft back wall are found to be beneficial for broadening the range of high–efficiency performance of the platform. The same wave transmission coefficient can be obtained by two multi–OWC platforms with inverse geometric constructions.

中文翻译：

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多振荡水柱 (OWC) 平台的水动力性能

摘要 本文考虑了一个由多个振荡水柱（OWCs）组成的矩形驳船，以下简称多振荡水柱平台。每个 OWC 室都被两个部分浸没的垂直墙和平台的甲板封闭。入射波在每个 OWC 腔室中产生水柱的振荡，因此空气被内部水面泵送流过安装在腔室顶部的 Wells 涡轮机。涡轮机的作用表现为线性动力输出 (PTO) 系统。开发了一种基于线性势流理论和特征函数展开方法的半解析模型来解决多 OWC 平台的波辐射和衍射问题。模型的直接和间接方法评估的水动力系数表现出良好的一致性，并且满足多OWC平台的能量守恒关系。然后将经过验证的模型应用于预测多 OWC 平台的波浪运动、动态气压、波浪功率提取以及波浪反射和透射系数。研究了 PTO 策略、腔室数量、整体平台尺寸和相邻腔室的相对尺寸对波浪功率提取和波浪衰减的影响。发现较小吃水的前壁和较大吃水的后壁有利于扩大平台的高效性能范围。