In order to investigate the hydrodynamic characteristics of high-density polyethylene(HDPE)floating pho-tovoltaic foundations,the 2×2 floating photovoltaic hydrodynamic model was established based on the three-dimensional potential flow theory and the damping lid algorithm.Damping lid was set inside the single basic unit and in the interstitial water body between multiple basic units to calculate the wave elevation of the gap water and study its characteristics.Un-der different wave directions,the first-order wave loads and the response amplitude operators(RAO)of the floating bodies were calculated to analyze the shielding effect between the floating bodies.The mooring model was established and time-domain computational analysis was carried out to investigate the motion characteristics of the floating body array and its mooring forces.The results show that setting damping lid can effectively suppress wave elevation that does not con-form to reality when the wave frequency exceeds 2.4 rad/s.There is a significant shading phenomenon between photovol-taic units,which is related to the relative position relationship between wave direction and units.The motion performance of the floating array is good,exhibiting obvious wave-frequency motion characteristics.
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