Active Flow Control of Separation on a 1/19th and 1/9th Scale Vertical Tail*

Coordinated simulations and experiments are compared on a 1/19^thand 1/9^thscale vertical tail with and without active flow control (mean aerodynamic chord Re = 350k and 700k respectively). On the larger model, both synthetic and sweeping jet actuators are considered while only synthetic jets were compared on the smaller model. Due to the unsteady nature of the flow control, most of the simulations employ DDES but comparisons are also made to RANS simulations.  Since computational efficiency is the prime motivation for using RANS simulations, it is common to replace the unsteady actuation by a steady jet with a concomitant adjustment of the strength. A comparison of the flow fields will be made to provide an assessment of this practice.