Experimental study on ocean internal wave force on vertical cylinders in different depths
Experimental study on ocean internal wave force on vertical cylinders in different depths
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DOI：
10.1007/s13344-016-0028-4
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发表时间：
2016-10
影响因子：
1.6
通讯作者：
Fei Wang;Haiyan Guo;Xiaomin Li;Fanshun Meng
中科院分区：
文献类型：
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作者：
Fei Wang;Haiyan Guo;Xiaomin Li;Fanshun Meng
在二维成层内波水槽中进行了内孤立波和内周期波对直立圆柱作用力的实验研究。在层厚比为0.2时，利用引力坍缩产生内孤立波;在层厚比为0.93时，利用摇板式造波机产生内周期波。通过染色照相法获得了波参数。相同尺寸的垂直圆柱体布置在不同的深度。测量了各缸的水平力，研究了各缸的垂直分布规律。改变内波高，研究波高对力的影响。结果表明，凹型内孤立波在上层流体中作用于垂直圆柱上的水平力与波的传播方向相同，而在下层流体中作用于垂直圆柱上的水平力与波的传播方向相反。水平力在下部流体中分布不均匀。不同水深处的力随波高的增加沿着增大。内孤立波可以对整个桩产生冲击荷载。内周期波作用于圆柱上的水平力随波的频率呈周期性变化。力的方向在上下层中相反，并且值接近。在上层，除靠近界面的深度外，力分布均匀;但在下层，力随深度的增加而减小。桩身内部的周期性波动会在整个桩身上产生周期性的剪切荷载，从而引起结构的疲劳破坏。
A series of experimental studies about the force of internal solitary wave and internal periodic wave on vertical cylinders have been carried out in a two-dimensional layered internal wave flume. The internal solitary waves are produced by means of gravitational collapse at the layer thickness ratio of 0.2, and the internal periodic waves are produced with rocker-flap wave maker at the layer thickness ratio of 0.93. The wave parameters are obtained through dyeing photography. The vertical cylinders of the same size are arranged in different depths. The horizontal force on each cylinder is measured and the vertical distribution rules are researched. The internal wave heights are changed to study the impact of wave heights on the force. The results show that the horizontal force of concave type internal solitary wave on vertical cylinder in the upper-layer fluid has the same direction as the wave propagating, while it has an opposite direction in the lower-layer. The horizontal force is not evenly distributed in the lower fluid. And the force at different depths increases along with wave height. Internal solitary wave can produce an impact load on the entire pile. The horizontal force of internal periodic waves on the vertical cylinders is periodically changed at the frequency of waves. The direction of the force is opposite in the upper and lower layers, and the value is close. In the upper layer except the depth close to the interface, the force is evenly distributed; but it tends to decrease with the deeper depth in the lower layer. A periodic shear load can be produced on the entire pile by internal periodic waves, and it may cause fatigue damage to structures.