ABSTRACT

The hydrodynamic responses of the floating platform, especially the heave, surge, and pitch motions have a great impact on the aerodynamic performance of the wind turbine. Consequently, the model and experiment data of a Y-shaped platform for floating offshore wind turbine is provided by University of Plymouth to study the hydrodynamics of this platform, namely the 1st FOWT Comparative Study. In this study, we investigate the hydrodynamic responses of the UMaine VolturnUS-S submersible floating platform based on the computational fluid dynamics. The well validated in-house code naoe-FOAM-SJTU developed for solving marine by Shanghai Jiao Tong University based on the open source platform OpenFOAM is employed to perform the numerical simulations. The simulation is operated by turbulence model k-ω SST employed for closure of RANS equations, and the VOF technique is used to track the two-phase flow interface. The cases are composed of the static equilibrium loading, the free decay test (including heave, surge and pitch motions) and a pair of focused wave conditions. From the simulation, the six degree of freedom motion and mooring system are in good contrast with experiment in the static equilibrium loading conditions. Moreover, the free-decay curves show that the heave motion is entirely consistent with experiment, and the error of pitch and surge are less than 10%. The motion response at the wave crest position is basically consistent, although we use CWA and JONSWAP methods to make the focused wave rather than the PM recommended from experiment.

INTRODUCTION

According to the ‘GLOBAL WIND REPORT 2022’ from Global Wind Energy Council, in 2021, the new offshore installations accounts for 21.1 GW, which represents three times more than previous year. The total offshore capacity has become to 57 GW (GWEC, 2022). The advantages of more resources of wind power with higher speed and less turbulent effects, bigger free areas for wind farms being installed, lower noise emission to city make the offshore wind energy have a further development prospect than onshore wind energy (Esteban et al., 2011). The exploit of wind power will gradually develop from onshore to inshore and then to offshore.

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