Experimental study of interactions between multi-directional focused wave and vertical circular cylinder, part II: Wave force
Experimental study of interactions between multi-directional focused wave and vertical circular cylinder, part II: Wave force
复制标题
DOI：
10.1016/j.coastaleng.2013.06.004
复制
发表时间：
2012-06
影响因子：
4.4
通讯作者：
Jinxuan Li;Zhanhang Wang;Shu-xue Liu
中科院分区：
文献类型：
--
作者：
Jinxuan Li;Zhanhang Wang;Shu-xue Liu
我们描述了实验与多方向聚焦波相互作用的一个垂直圆柱在一个三维波盆。本研究的重点是在爬高的多向聚焦波，波浪力，和波浪压力的圆柱。第一部分是关于波浪爬高的研究，Li等人（2012年）已经介绍过。本文采用直径为0.25 m的圆柱，考虑了不同的波浪参数，如聚焦波振幅、峰值频率、频带宽度和方向传播指数，对波浪作用于圆柱上的力进行了分析。模型scalekpa（kp是对应于峰值频率的波数，ais是圆柱体的半径）在0.32至0.65之间变化。对多向聚焦波作用于圆柱的最大力进行了测量和研究。结果表明，波浪参数对波浪力有显著影响，且多向聚焦波浪表面的空间轮廓也会影响其对圆柱的作用力，这与二维波浪不同。此外，还观察到了“二次加载循环”现象，并进行了讨论。在我们的实验中，“二次加载循环”发生时，kA> 0.36的所有情况下。而在一些参考的小尺度实验中，当波浪足够长时，即使fork A = 0.2，也观察到二次载荷循环。模型比尺越大，波陡越大，二次荷载循环越明显。
We describe experiments with multi-directional focused waves interacted with a vertical circular cylinder in a 3D wave basin. The focus of this study is on the run-up of multi-directional focused waves, wave forces, and wave pressures on the cylinder. Part I, the study on wave run-up, has already been presented by Li et al. (2012). In this paper, the analysis of the wave force on the vertical cylinder is presented.In this experiment, a cylinder with 0.25 m in diameter was adopted and different wave parameters, such as focused wave amplitude, peak frequency, frequency bandwidth and directional spreading index, are considered. The model scalekpa(kpis the wave number corresponding to peak frequency,ais the radium of the cylinder) varies from 0.32 to 0.65. The maximum forces of multi-directional focused wave on cylinder were measured and investigated. The results showed that the wave parameters have a significant influence on the wave force, and that the spatial profile of the surface of multi-directional focused wave can also affect its force on the cylinder, which is different from two-dimensional wave. In addition, the ‘secondary loading cycle’ phenomenon was also observed and discussed. In our experiments, the ‘secondary loading cycles’ occur whenkA> 0.36 for all cases. While in some referred small scale experiments, the secondary load cycles are observed even forkA= 0.2, when the waves are longer enough. To larger model scale, the pronounced secondary load cycle occurs with larger wave steepness waves.