Abstract: The lift, drag performance and flow structures of 2-D and 3-D flapping flat plate were calculated at the Reynolds number of 100. Navier-Stokes equations were solved by finite volume Method; the dynamic mesh method was taken to remesh the dynamic mesh in conjunction with the spring-based smoothing method and the Laplacian smoothing method. The parallel processing was applied to the 3-D cases to speedup the calculation. The lift performance of delayed rotation and synchronized rotation were calculated, the pressure distribution in the near region of the flapping plate was highlighted to illustrate the relationship of tip vortices and lift enhancement. The calculation results show that the interaction of tip vortices with lift performance is associated with the kinematic parameters of the flapping plate that can either promote the lift of the plate of the delayed rotation, or make a little impact of the synchronized rotation.

Key words: tip vortices, dynamic mesh, lift, flapping plate