Hydroelastic modelling of a deformable wave energy converter including power take-off

IF 4 2区工程技术 Q1 ENGINEERING, CIVIL Marine Structures Pub Date : 2024-07-23 DOI:10.1016/j.marstruc.2024.103678

Chao Wang , Yujia Wei , Wenchuang Chen , Luofeng Huang

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Abstract

Given the advantages of flexible wave energy converters (FlexWECs), such as deformation-led energy harnessing and structural loading compliance, there has been a significant interest in FlexWECs in both academia and industries. To simulate the FlexWEC interaction with ocean surface waves, a 3D computational fluid-structure interaction approach is developed in this study. The fluid and solid governing equations are discretized using finite difference and finite element methods, respectively. An immersed boundary method is used to couple the two independent grid systems. A novel numerical technique is introduced to model the dielectric elastomer generator (DEG) as the power take-off (PTO). The wave energy capture performance is analysed for different PTO configurations and at various wave conditions. Based on the obtained results, the PTO damping coefficient and the relative wavelength range that maximizes the capture width ratio (CWR) are determined. The wavefield results also reveal the presence of wave-height enhancement and attenuation points around a single FlexWEC, providing potential site selection references when deploying multiple FlexWECs in an array.

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可变形波浪能转换器（包括功率输出）的水弹性建模

鉴于柔性波浪能转换器（FlexWECs）具有以变形为主导的能量利用和结构载荷顺应性等优势，学术界和工业界对柔性波浪能转换器产生了浓厚的兴趣。为了模拟 FlexWEC 与海洋表面波的相互作用，本研究开发了一种三维流固耦合计算方法。流体和固体控制方程分别采用有限差分法和有限元法离散化。采用沉浸边界法将两个独立的网格系统耦合在一起。引入了一种新颖的数值技术，将介电弹性体发电机（DEG）作为动力输出（PTO）建模。分析了不同 PTO 配置和各种波浪条件下的波浪能捕获性能。根据所获得的结果，确定了 PTO 阻尼系数和使捕获宽度比（CWR）最大化的相对波长范围。波场结果还揭示了单个 FlexWEC 周围波高增强点和衰减点的存在，为在阵列中部署多个 FlexWEC 提供了潜在的选址参考。

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来源期刊

Marine Structures 工程技术-工程：海洋

CiteScore

8.70

自引率

7.70%

发文量

157

审稿时长

6.4 months

期刊介绍： This journal aims to provide a medium for presentation and discussion of the latest developments in research, design, fabrication and in-service experience relating to marine structures, i.e., all structures of steel, concrete, light alloy or composite construction having an interface with the sea, including ships, fixed and mobile offshore platforms, submarine and submersibles, pipelines, subsea systems for shallow and deep ocean operations and coastal structures such as piers.