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- W4313447110 abstract "Rising interest in the use of small aerial vehicles and the feasibility of deploying highly flexible structures require an understanding of how these systems may behave when they encounter gusts. In this work, we consider the problem of a pitching and plunging airfoil in a periodic transverse gust, and seek to understand the extent to which theoretical predictions of these unsteady effects match numerical simulations. A potential-flow model derived from a linear combination of the canonical Sears and Theodorsen problems is proposed to capture the unsteady lift on a thin two-dimensional airfoil in the small-perturbation limit. Using two-dimensional numerical simulations, we study the performance of a National Advisory Committee for Aeronautics (NACA) 0012 airfoil across a broad range of pitch, plunge, and gust amplitudes and frequencies, and quantify the amplitude and phase of the unsteady lift. Good agreement with the model predictions is found even at relatively high reduced frequencies, while minor deviations are observed when the angle-of-attack amplitudes approach the static flow-separation regime of the airfoil. Implications for model improvement and extensions are discussed for the cases in which the ideal-flow theory proves insufficient. In sum, the theoretical framework and numerical validation provide predictive capabilities for applications such as gust-load alleviation for increased robustness against fatigue and the optimization of flapping flight in gusty environments for enhanced maneuverability and control authority." @default.
- W4313447110 created "2023-01-06" @default.
- W4313447110 creator A5043507993 @default.
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- W4313447110 date "2022-12-29" @default.
- W4313447110 modified "2023-09-30" @default.
- W4313447110 title "On the Lift of an Oscillating Airfoil Encountering Periodic Gust Disturbances" @default.
- W4313447110 doi "https://doi.org/10.48550/arxiv.2212.14517" @default.
- W4313447110 hasPublicationYear "2022" @default.
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