Abstract
A novel ocean current power generation system is considered which has two major features: underwater floating configuration and two counter-rotating turbines. From the comparison of the CFD results for single turbine and twin-turbine with in-phase rotation, the time variation of the thrust due to the effects of beam wake and turbines interaction is estimated to be approximately 4% of the steady single turbine. It is found the thrust variation is also about 4%, when the two turbine models rotate with 90° phase shift. Furthermore, CFD with linear vertical velocity profile is carried out to simulate the actual oceanic condition. It is found that the velocity profile almost does not influence the thrust acting on the turbines.
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