passive separation control on a symmetric airfoil via elastic-layer

The passive control of flow-separation at averaged reynolds number (re=3.42×105) using self-adapting flexible-flaps in the upper side of the wing, is presented. the two-way fluid-structure interaction (fsi) in an elastic-layer up on the airfoil (naca 0012) is investigated numerically by coupling between the transient structural and fluid flow (fluent) in ansys-workbench 14.0. during the fluid-structure interaction, the transient deformation of the elastic-layer provokes the modification of the flow topology at large-scale. there are reductions of the size and intensity of the vortex-shedding and an increase in the strouhal number. this explains the increase of the lift-to-drag ratio. the study of the flap flexibility shows that the deformation of the elastic-layer and the variation of aeronautical efforts are inversely proportional to the young modulus.