This paper presents the development of an accurate and robust discrete adjoint approach for the optimization of active flow control mechanism. The adjoint solver is developed by applying algorithmic differentiation techniques to an incompressible unsteady Reynolds-averaged Navier–Stokes solver. Coupled with a quasi-Newton gradient-search optimization algorithm, its applicability is demonstrated by finding the optimal synthetic jet actuation on the suction side of the NACA 4412 airfoil at a Reynolds number Re=106 and angle of incidence of 20 deg. Numerical results have shown that the actuation sensitivities based on the unsteady discrete adjoint solver are in excellent agreement with the values obtained from the tangent-linear solver and finite differences. Compared to the stalled baseline flow, optimal actuated flow significantly increased the time-averaged lift by 54%, and the stall is delayed from 16 to 22 deg. A detailed analysis of sensitivities and the effect of optimal actuation on the separation is presented.
Accurate Discrete Adjoint Approach for Optimal Active Separation Control
AIAA journal ; 55 , 9
2017
Aufsatz (Zeitschrift)
Englisch
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