The effect of oscillating flows on aerodynamic of two airfoils in tandem

In this study, two-dimensional oscillating flow around two airfoils in tandem is numerically simulated. With assuming unsteady, incompressible and viscous flow, the effect of oscillating amplitude and frequency on aerodynamic characteristics at different angle of attack is investigated. The Reynolds number is selected 11600 for SD7003 airfoil model and the distance between two airfoils equals to one chord. After mesh and time independency study, the results validation is done. The purpose of this work is to reach to the flight stability conditions in gusty and oscillating flows for biplane Micro Air Vehicles. To do this, the effect of amplitude and frequency of oscillating flow and the effect of interaction between two airfoils at different angles of attack must be investigated. The results show that increasing the frequency of inlet flow oscillation leads to reduction in lift and enhancement in drag coefficient in leading airfoil, but for trailing one, both the lift and drag coefficient will be increased.