The effect of ducting on the performance of a vertical axis tidal turbine is studied. The calculation of the output power is done using a commercial code and a discrete vortex method. The results show that duct can highly boost the performance of the turbine in comparison to a turbine running in an open free stream. Increasing the output power along with providing a structure for mooring of the turbine introduces ducting as one of the best ways to make a reliable and efficient tidal turbine.

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