Current low-dimensional aerodynamic-modeling capabilities are greatly challenged in the face of aggressive flight maneuvers, such as rapid pitching motions that lead to aerodynamic stall. Nonlinearities associated with leading-edge vortex development and flow separation push existing real-time-capable aerodynamics models beyond their predictive limits, which puts reliable real-time flight simulation and control out of reach. In the present development, a push toward realizing real-time-capable models with enhanced predictive performance for flight operations has been made by considering the simpler problem of modeling an aggressively pitching airfoil in a low-dimensional manner. A parameter-varying model, composed of three coupled quasi-linear sub-models, is proposed to approximate the lift, drag, and pitching-moment response of an airfoil to arbitrarily prescribed aggressive ramp–hold pitching kinematics. An output-error-minimization strategy is used to identify the low-dimensional quasi-linear parameter-varying sub-models from input–output data gathered from low-Reynolds-number ( Re = 100 ) direct numerical fluid dynamics simulations. The resulting models have noteworthy predictive capabilities for arbitrary ramp–hold pitching maneuvers spanning a broad range of operating points, thus making the models especially useful for aerodynamic optimization and real-time control and simulation.


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    Title :

    Parameter-Varying Aerodynamics Models for Aggressive Pitching-Response Prediction


    Contributors:

    Published in:

    AIAA Journal ; 55 , 3 ; 693-701


    Publication date :

    2016-10-19


    Size :

    9 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English






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