Far-field wake behind a rotating ellipse at a low Reynolds number

Abstract eng:
Far-field wake pattern of flow past a rotating ellipse at a low Reynolds number Re = 200 was obtained by numerical computation. The effect of rotating speed was investigated over a wide range for the first time. Various different far-field wake patterns were observed. It is found that, at small rotating speeds, there exist apparent vortex sheet which is comprised of vortex dipoles or isolated vortices. At large rotating speeds, the shed vortices tend to strongly interact with each other and regular wake patterns no longer exist.

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