ABSTRACT

In the development of offshore wind energy resources, the basic hydrodynamic performance analysis of FOWT plays a crucial role for evaluating its adaptability to the marine environment and operational reliability. This paper provides numerical contribution to the comparative study conducted in the ISOPE 2023 regarding the limit load of FOWT in complex environment, by using the commercial software STAR− CCM+, the first-order linear superposition method will be used to establish the focused wave model to simulate the transient wave load. After being validated using the experimental data, a further investigation on the response of FOWT under transient excitation will be carried out.

INTRODUCTION

Over the past decade, wind energy has received extensive attention as one of the clean and renewable energy sources. With more flexible installation locations and access to more substantial wind resources than onshore wind turbines, floating offshore wind turbines (FOWT) have a non-negotiable position in the renewable energy industry (Spearman, et al., 2020 & Strivens, et al., 2021). According to the Offshore Wind Market Report 2022, global floating offshore wind capacity nearly tripled from 26,529MW (2021) to 50,623MW in 2021 (Musial, et al., 2022). The higher wind energy density brings greater challenges to the application of FOWT, which requires further research and analysis on the basic hydrodynamic performance of FOWT.

Simulation tools are regarded as the key to numerical simulation, and their number, demand and fidelity are increasing. In the past, most simulations have been performed using potential-flow-based solvers for the hydrodynamics and Blade-Element-Momentum theory (BEMT). These tools have also been applied to the performance analysis of floating offshore wind turbines. Several potential-flow solvers were used to simulate different loading conditions involving OC5 semi-submersible floating wind turbine by Robertson et al (2017). It could be confirmed that potential-flow-based methods do not accurately represent the oscillatory motion of the floater at natural frequencies. The reason is that the simplified methods used by these solvers are not accurate in predicting the viscosity effect (Tran, et al., 2015& Gueydon, et al., 2016)

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