Experimental Study on Ocean Internal Wave Force on Vertical Cylinders in Different Depths

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...

Full description

Saved in:
Bibliographic Details
Published in:China ocean engineering 2016-06, Vol.30 (3), p.459-468
Main Author: 王飞 郭海燕 李效民 孟凡顺
Format: Article
Language:English
Subjects:
Coastal Sciences
Cylinders
Direction
Engineering
Fatigue
Fatigue failure
Fluid- and Aerodynamics
Flumes
Force distribution
Gravitational collapse
Impact loads
Internal waves
Marine & Freshwater Sciences
Numerical and Computational Physics
Oceanography
Offshore Engineering
Photography
Piles
Simulation
Solitary waves
Technical Notes
Thickness ratio
Vertical cylinders
Vertical distribution
Vertical forces
Wave height
Wave parameters
Wave propagation
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:0890-5487
2191-8945
DOI:10.1007/s13344-016-0028-4