CFD ANALYSIS AND PARAMETRIC STUDY-OPTIMIZATION OF SUCTION- BLOWING FLOW CONTROL TECHNIQUES

Abstract. This paper is concerned with numerical predictions of active flow control techniques (pulsating jet, and steady suction) that are capable of suppressing flow separation regions in decelerating boundary layers. A parallel Navier-Stokes solver with one- or two-equation turbulence models and the appropriate boundary conditions, accompanied by the necessary unstructured grid generator, is used for the analysis or optimization (acting as the evaluation tool guided by a search method) of active flow control techniques. This software is first validated on benchmark cases, by comparing our numerical predictions with measurements. The parametric study of a flow control configuration, using the validated tool, follows. A step-by-step “optimization ” is carried out, in which the slot location and geometry as well as the blowing/suction characteristics are sequentially selected to maximize the reduction in viscous flow losses