Numerical Analysis of Spar Upending Behavior of Spar-Type Offshore Wind Turbine by Particle Method
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In this study, a method was developed to simulate the upending behavior of a spar during the construction of offshore wind turbines using a particle-based fluid-rigid body coupling approach. The upending process of the floating spar structure involves complex nonlinear interactions between large-scale fluid forces and rigid body motion during construction, which poses challenges in terms of accuracy and computational load. Particle methods have advantages in simulations involving complex free surface flow and fluid-rigid body interaction. We analyzed the upending behavior of the spar by coupling the low-resolution fluid simulation around the spar and the high-resolution fluid simulation of the ballast water in the spar at each time step using the MPS method. The simulation result was compared with the experimental data obtained by Yanagisawa et al. This study contributes to improving the safety and efficiency of the construction of spar-type offshore turbines by enabling the prediction of construction risks in advance. Our approach aims to provide a robust alternative to traditional methods.