Hydrodynamic Characteristics And Energy Capture Efficiency Of Cantilever Cylinder In VIVACE Generator Under Wave-current Conditions

As a kind of ocean energy,current energy can be exploited and utilized based on the principle of cylindrical vorticity vibration,which is a research hotspot in the field of renewable energy.Compared with the traditional Vortex Induced Vibration Aquatic Clean Energy(VIVACE)device,it has the advantages of low start-up velocity,low cost,no impact on the Marine ecological environment and long service life.At present,many scholars have studied the effect of ocean current on cylindrical load and power generation efficiency,but few results have been published on the effect of wave-current interaction.Therefore,it is of certain social value and engineering significance to study the hydrodynamic load and power generation efficiency of VIVACE under wave-current conditions.Aiming at the hydrodynamic characteristics of a cantilever cylinder moving at a free liquid surface,the dynamic response of a cantilever cylinder moving at a free liquid surface was numerically simulated based on the CFD method.The hydrodynamic load of the cantilever cylinder under different submerged depth,different radius of the cylinder and different velocity was calculated.According to the variation of vibration response of the cantilever cylinder,the energy capture efficiency of the cantilever cylinder under different conditions was calculated,and the variation of energy capture efficiency with different submerged depth,cylindrical radius and velocity was obtained.Aiming at the hydrodynamic characteristics of a cantilever cylinder in wave-current condition,a numerical simulation method was established to simulate the response of the cantilever cylinder in fixed and vertical motion under wave-current condition based on the numerical simulation of free surface.By changing the submerged depth,wave period,velocity and radius of the cylinder,the effect of the submerged depth on the hydrodynamic load of the cantilever cylinder was obtained.According to the vibration response of the cantilever cylinder,the energy capture efficiency under different conditions was calculated,and the energy capture efficiency changes with different submerged depth,wave period,velocity and radius of the cylinder were obtained.Aiming at the hydrodynamic characteristics of a cantilever cylinder rotating motion under wave-current conditions,the response of the cantilever cylinder rotating motion under wave-current conditions was numerically simulated by adding torque points and moments based on the CFD method.By changing the parameters of the cylinder,wave and moment arm,the hydrodynamic load of the cantilever cylinder under different submerged depth,wave period,velocity,moment arm length and moment arm Angle is obtained.According to the vibration response of the cylinder under different conditions,the energy capture efficiency changes with different submerged depth,wave period,velocity,moment arm length and moment arm Angle,etc.