Effects of the Actuation on the Boundary Layer of an Airfoil at Reynolds Number Re = 60000

Abstract

Ivette Rodriguez et al.in a significant part of the airfoil chord. As a consequence, airfoil aerodynamic efficiency increases by a 124% with a reduction of the drag coefficient about 46%. This kind of technique seems to be promising at delaying flow separation and its associated losses when the angle of attack increases beyond the maximum lift for the baseline case.

Large Eddy Simulation of optimal Synthetic Jet Actuation on a SD7003 airfoil in post-stall conditions

“…Baseline LES simulation agrees well with literature results, while RANS-SA would seem to remain a valid model to a certain degree. For optimally actuated cases, our LES simulation predicts far better performances than obtained by suboptimal SJA LES computations as reported by other authors [2] for the same airfoil, Re and α, which illustrates the applicability and effectiveness of the SJA optimisation technique applied, despite using the less accurate yet computationally faster SA-RANS. The flow topology and wake dynamics of baseline and SJA cases are thoroughly compared to elucidate the mechanism whereby aerodynamic performances are enhanced.…”

On the Characteristics of the Super-Critical Wake behind a Circular Cylinder

“…The pressure-velocity coupling is solved, using a non-incremental fractional-step method, whereas equations are explicitly integrated in time using a fourthorder Runge-Kutta method [23] combined with an eigenvalue-based time-step estimator [24]. The methodology used proved to be suitable on the resolution of turbulent flows (see, for instance, the author's recent works [25][26][27][28]) .…”

Introduction

“…In a recent work involving wind tunnel tests [38], Hasegawa and Obayashi find that with SJAs on a NACA0012 airfoil the maximum lift coefficient increases by 11% and stall is delayed by 4 • vis-a-vis the no SJA control scenario. In a recent work, [39] find that at AoA larger than that which provides lift maximization, SJA actuation ensures reattachment of the separated flow thereby increasing aerodynamic efficiency by 124% and drag reduction by around 45%.…”