The present study aims to investigate how the flexure of oscillating wings affect their hydrodynamic performance and tidal energy extraction efficiency based on their flapping motions. To achieve this goal, a numerical simulation is carried out by solving a low Mach number compressible Navier-Stokes equation for a parallel arranged twin wing system. Simulation covers a wide range of flapping frequency, various effective angles of attack, the degree of flexure and the gap between two wings. Our results indicate the improved energy efficiency with the use of flexible blade as compared to its rigid counterpart. This becomes more significant especially at high oscillating frequency.

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