Abstract Wave energy is one of renewable energy resources with great potential. Due to the mechanical and structural simplicity, Oscillating Water Column (OWC) Wave Energy Converter (WEC) is considered to be one of the most promising marine renewable energy devices. However, OWC remains not commercialized mainly due to its complex hydrodynamic performance and uncertainty in wave loads. In the present study, based on potential flow theory and time-domain higher-order boundary element method (HOBEM), a fully nonlinear numerical model is developed and used to investigate the wave-induced force and bending moment on a land-fixed dual-chamber OWC device. The Bernoulli equation is used to calculate the wave force and bending moment. The equation is modified by accounting for the pneumatic pressure in the air chamber and the viscosity effect and then solved using an acceleration-potential method. The numerical model was compared with the experiment carried out in a wave-current flume at the State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, China, and good agreement between the simulation and experimental results was observed. The horizontal components of wave forces on the two curtain walls of the dual-chamber OWC WEC were found to be much larger than the corresponding vertical components. The seaside curtain wall suffered much larger wave loads in comparison with the inner curtain wall. Therefore, the wave force on the seaside curtain wall is the dominant force. The largest wave-induced bending moment occurs at the joint of device and seabed. The effects of the sub-chamber width ratio and curtain-wall draft on the wave-induced force and bending moment are investigated. The dominant wave force and moment increase with curtain wall draft. And the peak wave loads can be reduced by moving the internal curtain wall close to the seaside curtain wall.

中文翻译：

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陆基双室振荡水柱波浪能装置的波浪载荷

摘要 波浪能是一种潜力巨大的可再生能源。由于机械和结构简单，振荡水柱（OWC）波浪能转换器（WEC）被认为是最有前途的海洋可再生能源装置之一。然而，OWC 仍未商业化，主要是由于其复杂的水动力性能和波浪载荷的不确定性。在本研究中，基于势流理论和时域高阶边界元法（HOBEM），开发了一个完全非线性的数值模型，并用于研究陆地固定双轴上的波浪诱导力和弯矩。室 OWC 装置。伯努利方程用于计算波浪力和弯矩。通过考虑气室中的气动压力和粘度效应来修改方程，然后使用加速度电位法求解。将该数值模型与大连理工大学海岸与海洋工程国家重点实验室在波浪流槽中进行的实验进行了对比，模拟结果与实验结果吻合良好。发现双室 OWC WEC 的两个幕墙上的波浪力水平分量远大于相应的垂直分量。与内幕墙相比，海边幕墙承受的波浪荷载要大得多。因此，作用在海边幕墙上的波浪力是主导力。最大的波浪诱导弯矩发生在装置和海床的连接处。研究了分室宽度比和幕墙吃水对波浪诱导力和弯矩的影响。主导波浪力和力矩随着幕墙吃水而增加。通过将内部幕墙靠近海边幕墙，可以降低峰值波浪荷载。