Summary of the 2004 CFD Validation Workshop on Synthetic Jets and Turbulent Separation Control

Summary of the 2004 CFD ValidationWorkshop on Synthetic Jets and TurbulentSeparation Control C. L. Rumsey ∗, T. B. Gatski †, W. L. Sellers III ‡, V. N. Vatsa §, S. A. Viken ¶ NASA Langley Research Center, Hampton, VA 23681-2199, USA Submission to AIAA Journal A CFD validation workshop for synthetic jets and turbulent separation control (CFD-VAL2004) was held in Williamsburg, Virginia in March 2004. Three cases were inves-tigated: synthetic jet into quiescent air, synthetic jet into a turbulent boundary layercrossow, and ow over a hump model with no-ow-control, steady suction, and oscilla-tory control. This paper is a summary of the CFD results from the workshop. Althoughsome detailed results are shown, mostly a broad viewpoint is taken, and the CFD state-of-the-art for predicting these types of ows is evaluated from a general point of view.Overall, for synthetic jets, CFD can only qualitatively predict the ow physics, but thereis some uncertainty regarding how to best model the unsteady boundary conditions fromthe experiment consistently. As a result, there is wide variation among CFD results. Forthe hump ow, CFD as a whole is capable of predicting many of the particulars of thisow provided that tunnel blockage is accounted for, but the length of the separated regioncompared to experimental results is consistently overpredicted.