Abstract
Hydrofoils have been widely used in ocean and offshore structures. The related research on their elastic response in turbulent flow is numerically challenging and of great interests for further engineering application. In this paper, the fluid-structure coupling numerical simulation of three-dimensional elastic hydrofoil is performed. The simulation is achieved using commercial Star CCM+. The SST (Shear Stress Transfer) k-ω turbulence model is used to simulate the vortex shedding and near-wall flow characteristics under different velocities. Then by coupling the FVM (Finite Volume Method), the elastic response of the hydrofoils is analyzed. The frequency domain characteristics of the flow induced vibration are analyzed by using fast Fourier transform. The natural frequency and corresponding vibration mode of the hydrofoil at low frequency are used to explain the co-effect of the natural frequency of the hydrofoil and the lift oscillation frequency on the coupled vibration state. Thus, the cavitation simulation based on Schnerr-Sauer model is carried out for FSI analysis. The dynamic response regime transformation is observed, subsequent frequency domain analysis and flow field characteristics are also presented.
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