Analysis of vortex-induced motion of cylindrical FPSO with motion suppression device
Aiming at the problem that the structure with circular cross section is easy to cause vortex-induced motion,CFD method is used to simulate the vortex-induced motion response of cylindrical FPSO with motion suppression device un-der different reduced velocity conditions.The analysis results show that when the reduced velocity Ur=5～6,the vortex-in-duced motion frequency of the cylindrical FPSO is close to the natural frequency of surge and sway motion,and there is a significant vortex-induced locking phenomenon,and the motion response increases.When the reduced velocity exceeds the lock-in range,the amplitude of the vortex-induced motion response will be significantly reduced,and there are two fre-quency responses in the motion response spectrum perpendicular to the flow direction.Comparing the motion results of the floating body in the direction perpendicular to the flow direction and the downstream direction at different flow velocities,it is found that the trajectory of the vortex-induced motion of the cylindrical FPSO with the motion suppression device is a'8'shaped.
万方数据
维普
