SUMMARYAfter several years of planning, the 1st International Workshop on High‐Order CFD Methods was successfully held in Nashville, Tennessee, on January 7–8, 2012, just before the 50th Aerospace Sciences Meeting. The American Institute of Aeronautics and Astronautics, the Air Force Office of Scientific Research, and the German Aerospace Center provided much needed support, financial and moral. Over 70 participants from all over the world across the research spectrum of academia, government labs, and private industry attended the workshop. Many exciting results were presented. In this review article, the main motivation and major findings from the workshop are described. Pacing items requiring further effort are presented. Copyright © 2013 John Wiley & Sons, Ltd.

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Using the Reynolds-averaged Navier-Stokes equations, the effects of a localized synthetic jet actuator on post-stall flows are numerically investigated. The control jet is placed on the the suction surface near the leading edge of a NACA0012 airfoil. Significant modifications to the flow field due to the low momentum synthetic jet were obtained. These modifications generally have favorable impacts on the aerodynamic performance of an airfoil, such as lift increase and drag reduction. The effect of governing parameters of synthetic jet control on the flow field are discussed, including forcing frequency, blowing magnitude, blowing direction and jet location. Relations among these factors are discussed.Lift variations due to synthetic jet flow control are approximately modeled by a second-order nonlinear dynamical system, with the synthetic jet represented by a harmonic forcing term. Effects of governing parameters of a synthetic jet are discussed from a dynamical point of view based on these results. Comparisons are made between the dynamical model and the CFD simulations. This dynamical systems approach offers a qualitative explanation of the behavior of post-stall flows and the dominant mechanisms of their control.

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