Dynamic Analysis of Monopile-Type Offshore Wind Turbine Under Sea Ice Coupling With Fluid-Structure Interaction

Yingzhou Liu,Shengwenjun Qi,Bin Wang,Wei Shi,Wenhua Wang,Xin Li

doi:10.3389/fmars.2022.839897

Abstract

The interaction between vertical offshore wind turbine (OWT) and sea ice with fluid is a complex process including local and global crushing of ice fragments and vibration of OWT. It is crucial to study the ice resistance of OWT structures considering the fluid-structure interaction (FSI). This article investigates a complete process of dynamic sea ice-monopile OWT interaction considering soil-structure interaction (SSI) and FSI effects. A fully coupled dynamic collision model of sea ice and OWT incorporating with the explicit non-linear collision tool ANSYS/LS-DYNA is proposed. The simulated ice loads in this study is verified by different simulation methods and international static ice force standards closely related to ice dynamic characteristic parameters. Then, the dynamic response and damage of the OWT structure during ice-structure interaction are studied using the fully interaction model with FSI coupling. The simulated ice force can produce a significant vibration response in the structure coupling with FSI due to occurrence of ice-induced resonance in the ice velocity range of 2.5–3.5 cm/s. Finally, the effect of fluid on the sea ice-OWT interaction in the initial velocity collision of sea ice is analyzed. FSI coupling can cause a certain level of collision hysteresis, accelerate the failure of sea ice breaking and reasonably reduce the energy of the structure.

Highlights

In the recent years, with the rapid development of new and renewable energy (Seeking et al, 2021; Zhao et al, 2021; Ren et al, 2022), offshore wind power industry is fast developing due to its high wind speed and less turbulence, less visual impact (Sun et al, 2012; Wang et al, 2022) comparing with onshore wind farms
A non-simultaneous ice force model of sea ice acting on a vertical offshore wind turbine (OWT) structure was proposed by Zhou et al (2019); the results showed that the proposed numerical model can capture the main trends of ice-wind turbine foundation interaction
It worth noting that Load cases (LCs) 1.1 is used to investigate structural dynamic response and damage of OWT with fluidstructure interaction (FSI), while LC 1.2 is used to study influence of the FSI on ice-structure interaction

Summary

INTRODUCTION

With the rapid development of new and renewable energy (Seeking et al, 2021; Zhao et al, 2021; Ren et al, 2022), offshore wind power industry is fast developing due to its high wind speed and less turbulence, less visual impact (Sun et al, 2012; Wang et al, 2022) comparing with onshore wind farms. Kuutti et al (2013) used a viscous surface method to establish the ice-structure interaction model to simulate the interaction between ice and a rigid vertical structure They indicated that the high-pressure zone type of contact has a significant impact on the crushing failure of sea ice. the dynamic characteristics of OWT structures were considered in the above studies, the ice loads in the numerical simulations were so simplified that the failure state of the ice floe during the collision and the process of ice-structure interaction could not be revealed. A numerical model is first developed to simulate a fully coupled dynamic interaction process of sea ice and a NREL 5 MW monopile OWT considering FSI effect. Density Yield stress Young’s modulus Shear modulus Bulk modulus Failure pressure Failure strain Poisson ratio Coefficient of friction Ice sheet thickness Ice drifting speed

E G K Pc ε v μ hi Vi

RESULTS

CONCLUSION

DATA AVAILABILITY STATEMENT