The numerical analysis on the two-dimensional flow around a corrugated wing section at Reynolds number 10,000 is carried out. The estimated lift coefficient shows unsteady behavior, depending on the angle of attack. The chaotic feature of its unsteadiness is discussed using the spectral analysis, the autocorrelation function, and the attractor construction using the time-delay coordinate. The observation of the flow field demonstrates that such feature is closely related to the unsteady motion of the separated vortices around the corrugated wing section.
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