Numerical simulations are carried out to explore flow control that delays transition generated by excrescence on a platelike geometry in subsonic flow. Both forward-facing and rearward-facing steps of small roughness heights are considered in the simulations. These are representative of joints and other surface imperfections on wing sections that disrupt laminar flow, thereby increasing skin friction and drag. Dielectric barrier discharge plasma-based flow control is employed to delay transition and increase the extent of the laminar flow region. Solutions are obtained to the Navier–Stokes equations, which were augmented by source terms used to characterize the body force imparted by a plasma actuator on the fluid. A simple phenomenological model provided these forces resulting from the electric field generated by the plasma. The numerical method is based upon a high-order numerical scheme and an implicit time-marching approach on overset mesh systems used to describe the steps. Very small-amplitude numerical forcing is applied to generate perturbations, which are amplified by the geometric disturbances and result in transition, similar to the physical situation. Both continuous and pulsed operations of actuators are investigated. Features of the flowfields are described, and comparisons are provided between the baseline and control cases. It is found that use of plasma actuators can maintain laminar flow for the entire length of the computational domain, resulting in a reduction of the integrated drag by up to 70%.


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    Titel :

    Plasma-Based Flow Control for Delay of Excrescence-Generated Transition


    Beteiligte:

    Erschienen in:

    AIAA Journal ; 53 , 6 ; 1455-1467


    Erscheinungsdatum :

    2015-04-08


    Format / Umfang :

    13 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch





    Plasma-Based Flow Control for Delay of Excrescence Generated Transition (AIAA 2014-1272)

    Rizzetta, D.P. / Visbal, M.R. / American Institute of Aeronautics and Astronautics | British Library Conference Proceedings | 2014


    Plasma-Based Control of Excrescence-Generated Transition on a Swept Wing

    Rizzetta, Donald P. / Visbal, Miguel | AIAA | 2016


    Numerical Simulation of Excrescence Generated Transition

    Rizzetta, D P | Online Contents | 2014