Abstract
The control parameters for a synthetic jet acting on a separated flow over hump are optimized by using multi objective optimization and effects of separation control are discussed. The following three parameters are used for operation of a synthetic jet: a synthetic jet position, a maximum velocity of jet and a synthetic jet frequency. A Direct Numerical Simulation (DNS) is performed by solving compressible, unsteady, laminar flows over a half cylindrical hump in two dimensions, and effectiveness of each operation of a synthetic jet is investigated. The optimization results show that periodic actuation improves aerodynamic coefficients. In particular, the performance of the synthetic jet placed around the top of the hump is better than other positions. A jet that is positioned at 94[deg.] and F^+ = 0.2 maximize the lift. On the other hand, a jet that is positioned at 104[deg.] and F^+ = 0.7 minimize the drag.
