Two-Way Fluid-Structure Interaction Numerical Simulation Method for Offshore Wind Power Based on Immersed Boundary Method

doi:10.12096/j.2096-4528.pgt.22015

Abstract

Abstract:

In order to study the flow field characteristics and dynamic fluid-structure interaction response of offshore wind turbine during operation process, the concept of integrated analysis of offshore wind power project was introduced and the simulation method for the integrated fluid-structure interaction operation process of offshore wind power was established based on the immersed boundary method. The stator-rotor interaction caused by the rotation of the fan was simulated by the immersed boundary method. With the alternating iteration method, a two-way fluid-structure interaction numerical method for the integrated research of offshore wind turbines “fan-tower-foundation” was presented. With the proposed method, the fluid-solid interaction effect of offshore wind turbine can be truly reflected and its dynamic response can be accurately solved. The immersed boundary method can effectively solve the stator-rotor interaction caused by fan rotation without updating the grid motion. Finally, the integrated fluid-structure interaction operation process of an offshore wind power project was simulated.

Key words: offshore wind power, two-way fluid-structure interaction, immersed boundary method, numerical simulation

CLC Number:

TK 83

Ronghui WU, Dong LIU, Ye YU, Kailong MU, Lanhao ZHAO. Two-Way Fluid-Structure Interaction Numerical Simulation Method for Offshore Wind Power Based on Immersed Boundary Method[J]. Power Generation Technology, 2023, 44(1): 44-52.

Figures/Tables 15

Fig. 1 Schematic diagram of integrated model

Fig. 2 Schematic diagram of solid model

Tab. 1 Material characteristics of solid model

参数

地基

混凝土承台(C40)

桩基

Q345

塔筒

Q355NC

Fig. 3 Schematic diagram of fluid model

Fig. 4 Schematic diagram of boundary conditions

Fig. 5 Velocity contour of different cross sections in x direction at t=34 s

Fig. 6 Velocity contour of different cross sections in y direction at t=34 s

Fig. 7 Pressure contour of y=0 m cross section at t=34 s

Fig. 8 Profiles of free surface at t=34 s

Fig. 9 x-direction displacement of offshore wind turbine at t=34 s

Fig. 10 x-direction displacement curve of blade tip with time

Fig. 11 Contour diagram of the first principal stress on windward side of fan blade

Fig. 12 Contour diagram of the third principal stress on windward side of fan blade

Fig. 13 Mises stress contour of tower at t=34 s

Fig. 14 Mises stress contour of pile foundation at t=34 s

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