Harmonic Energy Transfer for Extreme Waves in Current

• Published in: China ocean engineering Vol. 31; no. 2; pp. 160 - 166
• Main Authors: Ning, De-zhi, Du, Jun, Zhuo, Xiao-ling, Liu, Jia-zhen, Teng, Bin
• Format: Journal Article
• Language: English
• Published: Nanjing Chinese Ocean Engineering Society 01.04.2017; Springer Nature B.V; State Kay Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116023,China
• Subjects: Coastal Sciences; Defocusing; Energy transfer; Engineering; Extreme waves; Fast Fourier transformations; Fluid- and Aerodynamics; Marine & Freshwater Sciences; Nonlinearity; Numerical and Computational Physics; Oceanography; Offshore Engineering; Simulation; Two dimensional models; Wave crest; Wave crests; 快速傅立叶变换; 数值结果; 极值; 焦点位置; 相互作用; 线性能量传递; 调和; 谐波电流; extreme wave; focused wave group; fully nonlinear; partial wave-blocking; wave-current interaction
• ISSN: 0890-5487; 2191-8945
• DOI: 10.1007/s13344-017-0019-0

Ning et al. （2015） developed a 2D fully nonlinear potential model to investigate the interaction between focused waves and uniform currents. The effects of uniform current on focusing wave crest, focal time and focal position were given. As its extension, harmonic energy transfer for focused waves in uniform current is studied using the proposed model by Ning et al. （2015） and Fast Fourier Transformation （FFT） technique in this study. It shows that the strong opposing currents, inducing partial wave blocking and reducing the extreme wave crest, make the nonlinear energy transfer non-reversible in the focusing and defocusing processes. The numerical results also provide an explanation to address the shifts of focal points in consideration of the combination effects of wave nonlinearity and current.