The predition of aerodynamic characteristics and smart flap of airfoil under the ground effect have been carried out by integration of computational fluid dynamics. A parametric bending profile of a smart flap is designed considering different types of beams. Cantilever beam with uniformly varying load with roller support at the free end is considered here. A pressure-based implicit procedure to solve Navier-Stokes equations on a nonorthogonal mesh with collocated finite volume formulation is used to simulate. The boundedness criteria for this procedure are determained from Normalized Variable diagram (NVD) scheme. The procedure incorporates the eddy-viscosity turbulence model. The method is first validated against experimental data. Then, the algorithm is applied for turbulent aerodynamic flows around airfoil with smart and conventional flaps for different attack angle, flap angle and ground clearance where the results of two flaps are compared. It was found that 1-The pressure coefficient distribution in smart flap is smoother than conventional flap. 3- Lift-drag ratio in smart flap is higher than conventional flap. 4- The highest lift-drag ratio is at attack angle 2.5º 5- The highest lift-drag ratio is at flap angle 2.5º 6- the minimum ground clearance has the highest lift-drag ratio.

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