Through a, series of model test, the wave forces on horizontal and inclined circular cylinder were measured and analyzed. Based on Morison Equation and Stokes second order wave theory, the relationship between the hydrodynamic force coefficients with KC number and submerged water depth as well for horizontal cylinder were analyzed, also the relationship between the hydrodynamic force coefficients with KC number, inclined angle and the effect of water free surface as well for the inclined cylinder were investigated.


Structures with slender members used in coastal and offshore engineering, such as pile wharf, jacket platform etc., consist of not only vertical, horizontal cylinder, but mostly of inclined cylinder. The problem about wave forces acting on cylinders has been of special interest to offshore engineers. So far, much research on wave forces acting on vertical cylinders have been done, and the results of which have been used in the engineering practice already. But there are only a few research of wave forces on inclined and horizontal cylinders. Compared with vertical cylinder, the fluid behaviour around inclined cylinder are much complicated, so the research results of which have not been used in engineering practice yet. Through systematic research on wave forces on inclined cylinders, authors try to find the"relationship between hydrodynamic coefficients, inclined angle and KC number as well. This project was divided into two parts, regular wave test (reported in this paper) and irregular wave: test (by Teng and Li, 1990). The aims of this investigation are:

  1. to measure wave forces on horizontal cylinders fixed at different depths of submergence and wave forces on inclined cylinders in different inclined angles;

  2. to study the relationship between the hydrodynamic coefficients, KC number and inclined angles as well.

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