CFD performance enhancement of a low cut-in speed current Vertical Tidal Turbine through the nested hybridization of Savonius and Darrieus

•OpenFoam code validation against the experimental investigations on Savonius and Darrieus.•Performance assessment of Savonius, Darrieus and the nested hybrid turbines.•Proposal of new designs of a low cut-in speed hybrid turbine.•The hybrid asynchronous coupling with an identical rotational directi...

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