摘要：Fish are very efficient swimmers. In this paper, we studied a two degree-of-freedom (DOF) propeller that mimic fish caudal
fin like locomotion. Kinematics modelling and hydrodynamic CFD analyses of the two DOF propellers were conducted. According
to the CFD simulation, we show that negative power was generated within the flapping cycle, and wake flow at different instant
was demonstrated. Based on the dynamic model, we compared the thrust efficiency under different stiffness control method.
The results show that the thrust efficiency was enhanced under moderate stiffness control strategy.
