Amplification of nonlinear response of floating photovoltaics by coastal topography: Experimental and numerical study

IF 4.5 2区 工程技术 Q1 ENGINEERING, CIVIL
Qiujue Jiang , Deqing Zhang , Junfeng Du , Qingping Zou , Anteng Chang , Huajun Li
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引用次数: 0

Abstract

Nearshore coastal regions have become popular for floating photovoltaics (FPV) installations. During propagation over seabed topography towards nearshore FPV systems, waves undergo intricate transformations by shoaling, reflection and refraction, potentially influencing hydrodynamic responses of these emerging marine renewable energy structures in ways that are not well understood. Therefore, wave flume experiments and multiscale fully coupled time-domain fluid-structure interaction (FSI) simulations are performed to examine the topography effect on the nonlinear responses of nearshore FPV systems at a field site in the East China Sea. Experimental results reveal that near-resonant wave interactions in coastal regions drive significant energy transfer among different wave frequencies, amplifying the nonlinear dynamic responses of FPV systems by channeling energy toward their natural modes. As a result, second-order heave and pitch responses are amplified by up to 117.87 % and 136.38 % compared to the case without topography, which in turn lead to an increase in mooring tension. Moreover, the topography-induced amplification of nonlinear wave harmonics enhances the surge mean drift of FPV. This enhancement exhibits a negative correlation with the relative FPV length with respect to the wavelength. Comparisons between experiments and fully coupled simulations for irregular waves indicate that neglecting topography causes the FPV dynamic response model to produce inaccurate estimations of heave/pitch motions, while FSI simulations forced by high-fidelity local wave fields predicted by the fully nonlinear Boussinesq wave model are capable of capturing the observed topographic effect. These findings provide the theoretical basis for design consideration of the safe, cost-effective deployment of efficient FPV systems in coastal waters.
沿海地形对浮动光伏非线性响应的放大:实验和数值研究
近岸沿海地区已成为浮动光伏(FPV)安装的热门地区。在海底地形向近岸FPV系统传播的过程中,波浪通过浅滩、反射和折射经历了复杂的转变,可能以尚不清楚的方式影响这些新兴海洋可再生能源结构的水动力响应。为此,本文采用波浪水槽实验和多尺度全耦合时域流固耦合(FSI)模拟来研究地形对东海近岸FPV系统非线性响应的影响。实验结果表明,沿海地区的近共振波相互作用驱动不同波频之间的能量传递,通过将能量引导到其自然模态,放大了FPV系统的非线性动态响应。结果,与没有地形的情况相比,二阶升沉和俯仰响应放大了117.87%和136.38%,这反过来导致系泊张力增加。此外,地形引起的非线性谐波放大增强了FPV的浪涌平均漂移。这种增强与相对FPV长度相对于波长呈负相关。实验与不规则波的完全耦合模拟对比表明,忽略地形会导致FPV动力响应模型产生不准确的升沉/俯仰运动估计,而由完全非线性Boussinesq波模型预测的高保真局部波场强迫的FSI模拟能够捕捉到观测到的地形效应。这些发现为在沿海水域安全、经济地部署高效FPV系统的设计考虑提供了理论基础。
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来源期刊
Coastal Engineering
Coastal Engineering 工程技术-工程:大洋
CiteScore
9.20
自引率
13.60%
发文量
0
审稿时长
3.5 months
期刊介绍: Coastal Engineering is an international medium for coastal engineers and scientists. Combining practical applications with modern technological and scientific approaches, such as mathematical and numerical modelling, laboratory and field observations and experiments, it publishes fundamental studies as well as case studies on the following aspects of coastal, harbour and offshore engineering: waves, currents and sediment transport; coastal, estuarine and offshore morphology; technical and functional design of coastal and harbour structures; morphological and environmental impact of coastal, harbour and offshore structures.
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