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- W2215373851 abstract "In this study, the mechanism of vortex-induced vibration (VIV) mitigation using helical strakes is further investigated complying with the recent literatures. A rigid circular cylinder of diameter d = 80 mm attached with three-strand helical strakes of a dimension of 10d in pitch and 0.12d in height was tested in a wind tunnel. A bare cylinder was also tested to provide a benchmark for the straked cylinder system. It was found that the helical strakes reduce VIV by about 98%. Unlike the bare cylinder which experiences lock-in over the reduced velocity of 5 ~ 9, the straked cylinder does not show any lock-in region. In exploring the mechanism of VIV reduction by helical strakes, it was found that vortices shed from the straked cylinder are weakened significantly. The cross-correlation coefficients in the bare cylinder wake were much larger than that obtained in the straked cylinder wake, indicating that the correlation length of the former is larger than that of the latter. As a result, the straked cylinder wake agrees more favorably with isotropy than the bare cylinder wake." @default.
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- W2215373851 date "2010-01-01" @default.
- W2215373851 modified "2023-09-23" @default.
- W2215373851 title "Experimental Investigation on the Mechanism of VIV Reduction using Helical Strakes" @default.
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