Investigating the Effect of Roughness and Stiffness in 2D Aeroelastic Around Oscillatory Airfoil

Abstract

In this research, a software has been developed to investigate the effect of roughness and stiffness in twodimensional aeroelastic in unsteady viscous flow around oscillatory airfoil. In this simulation to solve the Navier-Stokes equations, finite volume method has been used in the code with a high resolution scheme for fluid and structure simulation in transonic flows. For this purpose, fluid and structural behavior is solved separately at each time step and the effect of each one on the other is considered. For computing convection term in transonic unsteady compressible flow, high order SBIC (Second and Blending Interpolation Combined) scheme based on discretization of Normalized Variables Diagram (NVD) is used. Here the technique of inlet velocity vector oscillation which is a simpler method in comparison with rather complicated methods such as dynamic mesh is applied. The two-dimensional motion equations are obtained from the Lagrangian equations which are combined with the aerodynamic equations. The results of validation show that the extracted data has a desirable accuracy and had good agreement to experimental data. The FSI results show that, 1: Lift coefficient in smooth surface is more than the rough surface and also the drag coefficient in rough surface is more than the smooth surface, 2: Shock strength is weaker in the rough surface, 3: The shock’s place has moved to leading edge in the rough surface, 4: The number of oscillations in rough surface is reduced, 5:The structural stability of the airfoil when the surface of the airfoil is rough is much greater than smooth surface, 6: Because the density of the air and the amplitude of the oscillations are small and also small effect on the lift and drag coefficients, can be ignored the added mass in this simulation method