COMPUTATIONAL STUDY OF SEPARATION CONTROL MECHANISM WITH THE IMAGINARY BODY FORCE ADDED TO THE FLOWS OVER

The effects of body force distribution on the control of airfoil separation flow are discussed. Steady body force is applied to the separation flow around the NACA0012 airfoil near the leading edge, and two-dimensional Favre-averaged Navier-Stokes equations are solved by conventional CFD method. In this paper, six body force models are considered. Mach number is 0.1 and Reynolds number based on the chord length is 100,000. The following characteristics are observed from the present results. The model applying the body force near the airfoil surface can restrain the airfoil flow separation than the model applying body force far from the airfoil surface. Therefore, body force near the airfoil surface is effective on the separation control. However, in the direction along the airfoil surface, the width of the region at which the body force acts is not very effective to the separation control. Finally, the body force in the vertical direction to the airfoil surface does not so much affect the separation control