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• W2335498636 abstract "It is well known from experiments and computational simulations that, at sufficiently high Strouhal numbers, oscillating airfoils exhibit deflected near-wake vortex patterns. We model this phenomenon as a starting wake flow and release point vortices into the freestream by neglecting the vortex formation process. Comparison with the experiments on pitching and plunging airfoils reveals that the model is able to predict the deflection of the wakes with increasing Strouhal number and normalized circulation. When the first vortex couple is released, their self-induced velocity is directed at an angle to the freestream, and its magnitude depends on a single parameter derived from the Strouhal number and normalized circulation. The starting flow reaches a stable state rapidly, and forms an upward or downward deflected wake, depending on the initial vortex configuration. Dual wake modes of the asymmetric bifurcation observed in the experiments for nonzero mean angle of attack was simulated by adding a bound lumped vortex to represent the mean circulation of the airfoil and using the experimentally measured circulations of the vortices. The results are in good agreement with the experiments, and predict the increasing bias towards downward-deflected wakes with increasing angles of attack. We show that the difference in the strength of the vortices is the most important parameter. The predicted critical asymmetry parameter (difference in the strength of vortices) beyond which an upward deflected wake is not possible is in good agreement with the experiments. The mechanism of switching from an initially upward-deflected wake to a final downwarddeflected wake involves the weaker vortex changing partner and forming a new couple with the stronger vortex from the previous cycle." @default.
• W2335498636 created "2016-06-24" @default.
• W2335498636 creator A5022757901 @default.
• W2335498636 creator A5071218319 @default.
• W2335498636 date "2016-01-02" @default.
• W2335498636 modified "2023-09-28" @default.
• W2335498636 title "A Simple Model of Asymmetric Wakes for Periodically Oscillating Airfoils" @default.
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• W2335498636 doi "https://doi.org/10.2514/6.2016-1604" @default.
• W2335498636 hasPublicationYear "2016" @default.
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