Numerical and experimental investigation of nonlinear focused waves-current interaction with a submerged plate
Numerical and experimental investigation of nonlinear focused waves-current interaction with a submerged plate
复制标题
DOI：
10.1016/j.oceaneng.2017.02.038
复制
发表时间：
2017-05
影响因子：
5
通讯作者：
Yong Cheng;C. Ji;Zhe Ma;G. Zhai;Gaidai Oleg
中科院分区：
文献类型：
--
作者：
Yong Cheng;C. Ji;Zhe Ma;G. Zhai;Gaidai Oleg
本文用二维非线性势流理论研究了聚焦波与均匀流和淹没平板的相互作用。采用基于时域高阶边界元法（HOBEM）的完全非线性数值波浪水槽（NWT）进行数值求解。在模型中，Goda的方法进行了修改，以区分入射波和反射波，而加速度势的方法被引入到确定结构上的水动力。在江苏科技大学的二维玻璃壁波浪水槽中进行了相应的实验。已发表的数值结果和实验测试验证所开发的模型。通过系统的参数研究发现，由于海流的多普勒补偿效应，不同海流的最大反射或最小透射出现在同一板宽处。频谱分析表明，能量耗散主要发生在基波时，聚焦波传播的平板。海流对波浪力的影响大于对波面高程的影响。此外，“二次加载循环”现象也观察到的波浪力的时间序列中的后续流。
This paper concerns the interaction of focused waves with uniform current and a submerged horizontal plate in the context of the two-dimensional nonlinear potential theory. A fully nonlinear NWT (numerical wave tank) based on a time domain HOBEM (higher-order boundary element method) is applied to the numerical solutions. In the model, the Goda's method is modified to discriminate incident and reflected waves, whereas the acceleration potential approach is introduced to determine the hydrodynamic forces on the structure. The corresponding experiments are also conducted in a two-dimensional glass-walled wave tank at Jiangsu University of Science and technology. The developed model is verified with published numerical results and validated with experimental test. Through a systematic parametric study, it is found that the maximum reflection or minimum transmission for different currents occur at the same plate width because of the compensating Doppler effects of current. The spectral analysis reveals that the energy dissipation occurs primarily in the fundamental waves when focused waves propagating over the plate. The current has a stronger influence on the wave forces than on wave surface elevation. Furthermore, the 'secondary loading cycle' phenomenon is also observed in the time series of the wave forces for a following current.