Abstract
Vortex induced vibration (VIV) is frequently observed in marine engineering structures, especially propeller blades, rudders, risers , etc. Under specific circumstances, the vortex shedding frequency is locked to the natural frequency of the structure, resulting in severe VIV, causing structural fatigue. This research addresses the effects of hydrofoil the trailing edge thickness on the wake dynamic with a special focus on the vortex shedding frequency, vortex-induced vibration and special lock-in phenomenon. A finite volume solid stress method was employed to simulate the solid stress. An SST k-omega turbulence model was conducted to simulate the transient flow. The vortex shedding characteristics and hydrodynamic performance of two-dimensional NACA0009 hydrofoils are studied. The frequency domain analysis of hydrodynamic parameters is implemented by fast Fourier transform.It was founded that the effect of reducing VIV and avoiding lock-in phenomenon can be achieved rapidly by adjusting the hydrofoil trailing edge thickness.
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