SLOW DRIFT DAMPING FORCE ACTING ON A CYLINDER IN WAVES  

作　　者：Hu Chang-hong(Kyushu University, kasuga, Japan)Liu Yin-zhong(Shanghai Jiao Tong University, Shanghai 200030,P. R. China Wataru Koterayama)(Kyushu University, kasuga,Japan ) 

出　　处：《Journal of Hydrodynamics》1995年第4期82-95,共14页水动力学研究与进展B辑（英文版）

摘　　要：Hydrodynamic forces acting on a vertical or a horizontal cylinder undergoing Slow drift oscillation in waves were investigated experimentally and numerically. In the experimental study forced oscillation tests with low frequency and large amplitUde in regular waves and fortal two harmonic oscillation with combined low and high frequenceies were carried out. In the numerical study a finite difference method was used to simulate flows around a two dimensional oscillating cylinder.The results show that the slow drift damping farce coeffiCient dependS mainlyon the reduced velocity denned by the maximum velocity of the slow oscillation, period of incident wave and diameter of the column. However, a.rectangular cylinder oscillationg slowly in waves has much higher dameping coefficients than that oscillationg in two-harmonic mode. The numerical study revealed some relations between the damping force coefficients and the vortex shedding patterns.Hydrodynamic forces acting on a vertical or a horizontal cylinder undergoing Slow drift oscillation in waves were investigated experimentally and numerically. In the experimental study forced oscillation tests with low frequency and large amplitUde in regular waves and fortal two harmonic oscillation with combined low and high frequenceies were carried out. In the numerical study a finite difference method was used to simulate flows around a two dimensional oscillating cylinder.The results show that the slow drift damping farce coeffiCient dependS mainlyon the reduced velocity denned by the maximum velocity of the slow oscillation, period of incident wave and diameter of the column. However, a.rectangular cylinder oscillationg slowly in waves has much higher dameping coefficients than that oscillationg in two-harmonic mode. The numerical study revealed some relations between the damping force coefficients and the vortex shedding patterns.

关 键 词：damping force WAVES CYLINDER 

分 类 号：O353.2[理学—流体力学]