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Vertical axis water turbine (hereafter VAWT) is the common investigated equipment in tidal streams turbine generator system. In this paper, the flow fields around a VAWT were numerical simulated with emphasis on the hydrodynamic performance of VAWT. The simulations were undertaken with the Computational Fluid Dynamics (CFD) software FLUENT 6.2 using the sliding meshes controlled by user-defined functions...
The dynamic model of the rub-impact rotor system with an parallel misalignment was set up. By the displacement constraint between rotors, the dynamic equations was developed on the Lagrange method. Simulations show that the rotor system's low frequencies with large amplitude are 1/2, 1 and 3/2 octave spetrums. If the parallel misalignment is small, the displacement is small as the parallel becomes...
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