Proceedings of the Thirty-second (2022) International Ocean and Polar Engineering Conference
Shanghai, China, June 5–10, 2022
Copyright © 2022 by the International Society of Offshore and Polar Engineers (ISOPE)
ISBN 978-1-880653-81-4; ISSN 1098-6189

www.isope.org

Study on Hydrodynamic Performance of the Cylindrical Buoy-Rope-Drum Wave Power Generation
Yue Deng1, 2, Yaning Li1, Yingzhi Cao1,Lixi Zhao1,Jin Li1, Jingli Zhao1*
1

National Marine Data and Information Service, Tianjin, China
2
Shandong University, Weihai, China*
Corresponding author

motion of the floating body is the most concerned of the device. Caska(2008) and others studied the hydrodynamic performance of acylindrical float hinged at the bottom on the seafloor by using theanalytical method. When calculating the motion of the float in regularwaves, they used the first-order nonlinear formula and found that thenonlinear drag force greatly affected the motion performance of thefloat. Mehdi et al. (2013) designed a point suction wave energy device
located in assaluye port, Iran based on the linear wave theory. Theresearch found that changing the flat bottom cylindrical float into avertebral float significantly reduced the heave damping and increased
the heave amplitude of the float. Guo (2016) took the typical point
absorption wave energy device as the research object, establishes thehydrodynamic model of the float in the wave energy device by
combining theoretical analysis and numerical simulation, and studies
the motion, load, energy absorption characteristics, free surface
deformation and flow field of the typical wave energy device. Qi et al.
(2015) designed three kinds of mouth section three screw head spiralguide plates with pitch / diameter ratio for cylinders with high mass
damping ratio, and carried out wind tunnel experiments to study its
suppression effect on vortex induced vibration. Xu et al. (2018) studied
the suppression effect of spiral plates on vortex induced vibration ofcylinders in an indoor towing tank.

ABSTRACTIn this paper, the hydrodynamic performance of cylindrical buoy-ropedrum wave power generation device was studied. Firstly, the threedimensional grid model of buoy-rope-drum wave power generation
device was established. The hydrodynamic performance of the wholecylindrical buoy-rope-drum wave power generation device wascalculated by using computational fluid dynamics method and fluent
combined with C++ programming. The motion of the floating bodywas realized by using dynamic grid, and the structural heave and sway
curves were obtained. In addition, the vortex induced motion of thecylindrical buoy-rope-drum wave power generation device wasnumerically calculated in this paper, and the method of restraining thevortex induced motion of the cylinder by the spiral side plate suitable
for this structure was calculated and analyzed. Three side plate heights
H0.1D, H0.2D,H0.3D, the drag coefficient and vibration displacementof cylindrical wave power generation device with spiral side plate werecalculated with different pitch.

KEY WORDS: Circular cylinder; Wave power; VIM; Heave; Roll.
INTRODUCTION

In this study, the hydrodynamic characteristics of the buoy-rope-drumwave power generation device were calculated. The heave, roll, dragforce coefficient and the amplitude of vortex induced vibration werecalculated, and their relationships with the spiral side plate wereanalyzed. Therefore, the ineffective movement can be reduced byimproving the structure of the floating body, so as to further improve
the power generation efficiency.

Wave energy power generation devices convert the kinetic energy andpotential energy of the ocean floating structure moving with the wave
into electric energy. According to the research and development resultsof different research institutions, there are many kinds of wave energy
power generation devices, but many of them adopt cylindrical structure
or improved structure based on cylinder. The single heave point
absorption wave energy power generation device developed by Ohio
State University was composed of a cylinder foundation and an
oscillating float. The cylinder foundation was connected with theseabed through a rigid cable, and the float moves relative to thecylinder foundation. Wavebob was a double body heave point
absorption wave power generation device developed by Ireland. Itconsists of two coaxial cylindrical floating bodies. The lower
cylindrical floating body is completely submerged in the sea. The heave

NUMERICAL COMPUTATIONS
The governing equations are the three-dimensional incompressible
Navier-Stokes equations, continuity equation and momentum equation
for Cartesian coordinates are1813