Abstract
An approach for numerically representing turbulence effects in the simulation of ocean current turbines (OCT)s is described. Ambient turbulence intensity and mean flow velocity are utilized to develop analytic expressions for flow velocities at a grid of nodes that are a function of time. This approach is integrated into the numerical simulation of an OCT to evaluate effects of turbulence on performance. For a case study a moored OCT with a 20m rotor diameter is used. Mean power in the presence of ambient turbulence intensities (TI)s of 5% and 20% are found to be 370kW and 384kW, with standard deviations of 17.2kW and 74.6kW respectively. Similarly, the axial loads on a single blade of the three-bladed rotor are found to be 139kN and 140kN, with standard deviations of 3kN and 12kN respectively for these TIs.
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