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2D fluid structure interaction analysis of a vertical axis tidal turbine blade using periodic inflow equivalence model

Arini, Nu Rhahida, Turnock, Stephen and Tan, Mingyi (2017) 2D fluid structure interaction analysis of a vertical axis tidal turbine blade using periodic inflow equivalence model Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment

Record type: Article


Fluid structure response of vertical axis tidal turbine blades using NACA 0012 and periodic inflow equivalence model is predicted in this work. The response is investigated numerically by developing a 2D CFD model at high Reynolds number (3.07x106). The periodic inflow equivalence model is conducted by modelling the rotation of the turbine as time dependent unsteady incoming fluid velocity and angle of attack variation entering the 2D CFD domain. The blade response is modeled by a vibrational system with spring damper components which are attached at the blade fluid dynamic center point. The aim of this study is to predict a resonant condition or a lock-in frequency induced by wake generation at a vertical axis turbine blade during the turbine operation. The model is generated using a dynamic mesh construction in OpenFOAM 2.2 and the mesh is refined using snappyHexMesh utility. The mesh has seven added boundary layers around the blade surface and simulated using k-ω SST turbulence model. Drag, lift and moment force coefficient are observed during 12 seconds which is equal to 3.3 revolutions and extracted using Fast Fourier Transform method to obtain its predominant frequency. The predominant frequency determines the dynamic condition of the blade and is used for predicting a resonance based on the turbine’s natural frequency. The result shows that the vertical axis tidal turbine which is manufactured from a composite with material pitch stiffness of 200 Nm/radians, heave stiffness of 1000 N/s, and operates at tidal velocity of 0.656 m/s is found to experience a resonance or lock-in phenomena induced by wake generation in the pitch mode response.

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Accepted/In Press date: 17 August 2017


Local EPrints ID: 414954
ISSN: 1475-0902
PURE UUID: 37830f17-a8c5-4f77-857b-a2d50c64b2ab
ORCID for Stephen Turnock: ORCID iD

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Date deposited: 18 Oct 2017 16:30
Last modified: 16 Nov 2017 05:01

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