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A wake behind a circular cylinder at Reynolds number 850-1700 was visualized by the smoke-wire method. The observations of the flow together with the results of quantitative measurements, such as various velocity correlation coefficients, illustrated the formation process of spoon-shaped large eddies in the region 90≤<I>x/d</I>≤230 attained through the deformation and rearrangement of the regular Kármán vortices. A spoon vortex was likely to pair with the counterpart on the opposite side of the wake. The large scale bulges of the turbulent and non-turbulent interface of the wake were shown to correspond to these spoon vortices.<BR>These results indicate that some of coherent structures are organized by rearrangement and deformation of initially regular vortex in the turbulent flow.
- 社団法人 日本流体力学会の論文