부산대학교 도서관

Inspired by the fact that flexible wing in nature possesses advance aerodynamic performance, a numerical experiment is applied to investigatethe aerodynamic performance of flexible wing in plunge motion, where the incompressible Navier-Stokes (N-S) equations coupledwith the structural dynamic equation for the motion of the wing is solved. A two-dimensional, elastic and inextensible beam modelwing is considered at Re = 1256. The harmonic plunge motion is specified at the leading edge of wing, and the other part of wing is respondedpassively deforming by the aerodynamic force. By analyzing the flow field, aerodynamic force and energy efficiency of differentflexibility wings, it is found that the flexibility influences the aerodynamic characteristics of the plunge wing greatly and when theplunge frequency is less than the structural frequency the flexibility can increase the thrust force and the energy efficiency of the wing,and the maximum energy efficiency is obtained when the wing plunge near the resonance. Moreover, a lighter wing possesses largerenergy efficiency than a heavier wing, but it may not be functioning for too light wing. The results obtained in this study will providephysical insight into the understanding of fluid and structure interaction problem.