On streamwise vortices in turbulent wakes of cylinders

AIP Publishing - Tập 5 Số 2 - Trang 387-392 - 1993
Byram Bays-Muchmore1, A. Ahmed1
1Department of Aerospace Engineering, Texas A&M University, College Station, Texas 77843-3141

Tóm tắt

Flow-visualization methods were used to explore the structure of streamwise vortices and their interactions with the von Kármán vortices in the immediate wakes of cylinders. The experiments were conducted in a water tunnel at Reynolds numbers from 330–21 000 based on cylinder diameter. Over this entire range of Reynolds number, pairs of counter-rotating streamwise vortices were observed immediately behind the cylinders, with a mean spanwise spacing of approximately one pair per diameter. The streamwise vortices significantly distorted the von Kármán vortices, but only on their upstream-facing sides. The cylinder near-surface-flow topology was found to include a secondary separation line containing ‘‘dominant-foci structures’’ whose spanwise locations correlated with those of the streamwise vortices.

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Tài liệu tham khảo

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AIP Publishing

Tập 5 Số 2

387-392

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