首页|Numerical investigation on local resonance within an array of C-shaped cylinders in water waves

Numerical investigation on local resonance within an array of C-shaped cylinders in water waves

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In this work,computational fluid dynamics(CFD)-based simulations and linear diffraction analysis are carried out to investigate the interaction between water waves and metamaterials composed of an array of C-shaped cylinders.The flow visualization by CFD-based simulations reveals that local resonance is a result of constructive interference between the incident wave and the wave radiated from the cavity of the C-shaped cylinder.The wave-induced water motion inside the cavity acts as a source of generating this radiated wave,which has the same angular wave frequency and wavenumber but opposite propagation direction as the incident wave.In addition,it is found from the CFD-based simulations that the energy dissipation increases as the opening of the C-shaped cylinder becomes shorter and sharper,along with an increase in its outer radius,and the variation trend of energy dissipation is only affected by the outer radius.Meanwhile,except for very small opening lengths,variations in opening length,width,and outer radius do not significantly impact the wave attenuation effect of the C-shaped cylinder array.Moreover,the results obtained by CFD and the linear potential flow model are compared.The linear potential flow theory is proven to be a reliable approach for accurately predicting the local resonant frequency and transmission coefficients within the local resonant band across a range of geometric parameters.However,it is noted that this theory may have limitations when applied to cases with extremely small opening lengths,where it struggles to accurately predict the local resonant frequency and the intensity of local resonance.

Local resonanceC-shaped cylinder arrayopening lengthwave attenuationcomputational fluid dynamics(CFD)

Jin Xu、De-zhi Ning、Li-fen Chen、Huan-wen Liu

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State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China

Dalian Key Laboratory of Offshore Renewable Energy,Dalian University of Technology,Dalian 116024,China

College of Water Conservancy and Civil Engineering,Ludong University,Yantai 264025,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaFundamental Research Funds for the Central Universities

U22A202425227126052371263DUT242D411

2024

10.1007/s42241-024-0050-6

水动力学研究与进展B辑
中国船舶科学研究中心

水动力学研究与进展B辑

CSTPCDEI
影响因子：0.596
ISSN：1001-6058
年,卷(期)：2024.36(4)