Computational Fluid Dynamics 2002 pp 701-706 | Cite as
Numerical Simulation of Unsteady Viscous Flow Around a Flapping Wing
Abstract
In order to investigate the effects of dynamic stall phenomenon on the propulsive efficiency, thrust and lift of flapping wing of a bird, unsteady viscous flow simulations have been performed by using a 3D Navier-Stokes code. As a result of the simulations about a typical pigeon wing which has thick-large-cambered airfoil sections and a peculiar nose-up twist distribution, it is shown that the occurrence of the flow separation is unavoidable around the tip region to maintain the high lift and appropriate thrust, wherefore the propulsive efficiency remains less than 0.5. This is in sharp contrast with the results of the existing potential flow analyses that predict the very high propulsive efficiency of the order of 0.8 ∼ 0.9.
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