Session: 01-03-02 Hydrodynamics-2

Submission Number: 182028

Motion Response Analysis of a 6mw Semi-Submersible Floating Wind Turbine Under Focused Waves 

With the advancement of global carbon neutrality goals, wind energy plays a key role in renewable energy development strategies across nations. Compared with fixed wind turbines, floating offshore wind turbines (FOWTs) experience significant oscillatory motions under wave loads, particularly in extreme sea states, which critically impact their power generation efficiency and structural safety. In this paper, a model of a 6MW floating offshore wind turbine is established using STAR-CCM+ software. The VOF method is employed to capture the free surface, and focused waves are numerically generated through the superposition of linear wave components at different frequencies. Overset grid technology along with the DFBI method is used to calculate the motion response of the turbine's foundation under wave conditions. A user program written in C++ integrates the MoorDyn program into the STAR-CCM+ DFBI module, and a dynamic mooring model is used to calculate the mooring line forces and moments, enabling the coupling between the floating foundation and the mooring system. The feasibility of using CFD combined with dynamic mooring methods for calculating the dynamic response of floating offshore wind turbine foundations is verified through comparing with experimental results. Based on the numerical results, compared to random waves, the motion amplitude of the wind turbine foundation and the peak mooring cable forces exhibit a significant increase under focused waves. At the same time, the response spectrum obtained from the time histories also display more pronounced peaks. This research offers valuable insights for the design and optimization of floating offshore wind turbines.

Presenting Author: Peiyao Liu Shanghai Jiao Tong University

Presenting Author Biography: Master's student at Shanghai Jiao Tong University, with a primary research focus on the motion response of floating offshore wind turbines under waves.

Authors:

Peiyao Liu Shanghai Jiao Tong University
Ju Fan Shanghai Jiao Tong University
Yang Gao Hohai University
Yunxiang You Shanghai Jiao Tong University