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A fluid structure interaction method for airfoil with a local flexible structure is presented for flow control of Micro Air Vehicles.An improved ALE-CBS scheme is developed for fluid and structure coupling in combination with the theory of shallow arch with large deformation.After the verification of the presented algorithm,the method is used to study the interaction between flow and airfoil with a local flexible structure with different elastic stiffness.The momentum and energy exchange are investigated to reveal the unsteady coupling effects on aerodynamic performance.The results show that unsteady interaction between fluid and structure has a great influence on momentum and energy exchange between the boundary layer and main flow.Furthermore,it influences the aerodynamic performance of the airfoil greatly.When the structure is strongly interacted with the unsteady flow with the frequencies related to the natural shedding frequency of the flow,the aerodynamic performance of the airfoil can be enhanced significantly.The utilization of local flexible structure can be considered as an effective flow control technique for enhancement of the aerodynamic performance of Micro Air Vehicles.