Three model motions were developed to replicate the aerodynamic response of a transverse gust. These motions included a pure plunging and two three-degree-of-freedom motions that approximated the angle-of-attack distribution produced by the gust. Using inviscid models and viscous flow simulations, the responses of the gust and model motions were compared as a function of the nondimensional reduced frequency. The inviscid model was found to overestimate the influence of the rotational added mass in the three-degree-of-freedom motions. In contrast, the viscous flow simulations showed that the two primary sources of discrepancy between the gust and model motions lie in the nonlinear angle-of-attack distribution caused by the gust and the wake development during the model motions. Flow simulations showed that all three motions experienced greater than 90% agreement in lift for gusts with reduced frequencies less than 0.5, indicating that, under this reduced frequency, 1) the effect of the gust convection is minimal, and 2) a pure-plunging motion may suffice for modeling gusts. However, at higher reduced frequencies, the pure-plunging motion experiences greater than 10% worse agreement than the three-degree-of-freedom motions. Overall, the motions provide a good approximation with greater than 90% accuracy in lift for gusts of reduced frequencies less than k = 0.75 .


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    Title :

    Modeling Transverse Gusts Using Pitching, Plunging, and Surging Airfoil Motions


    Contributors:

    Published in:

    AIAA Journal ; 56 , 8 ; 3271-3278


    Publication date :

    2018-08-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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