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Title: Streamwise evolution of an inclined cylinder wake
Authors: Wang, HF
Razali, SM
Zhou, TM
Zhou, Y
Cheng, L 
Issue Date: 2011
Publisher: Springer
Source: Experiments in fluids, 2011, v. 51, no. 2, p. 553-570 How to cite?
Journal: Experiments in fluids 
Abstract: The streamwise evolution of an inclined circular cylinder wake was investigated by measuring all three velocity and vorticity components using an eight-hotwire vorticity probe in a wind tunnel at a Reynolds number Red of 7,200 based on free stream velocity (U ∞) and cylinder diameter (d). The measurements were conducted at four different inclination angles (α), namely 0°, 15°, 30°, and 45° and at three downstream locations, i.e., x/d = 10, 20, and 40 from the cylinder. At x/d = 10, the effects of α on the three coherent vorticity components are negligibly small for α ≤ 15°. When α increases further to 45°, the maximum of coherent spanwise vorticity reduces by about 50%, while that of the streamwise vorticity increases by about 70%. Similar results are found at x/d = 20, indicating the impaired spanwise vortices and the enhancement of the three-dimensionality of the wake with increasing α. The streamwise decay rate of the coherent spanwise vorticity is smaller for a larger α. This is because the streamwise spacing between the spanwise vortices is bigger for a larger α, resulting in a weak interaction between the vortices and hence slower decaying rate in the streamwise direction. For all tested α, the coherent contribution to v2 is remarkable at x/d = 10 and 20 and significantly larger than that to u2 and w2. This contribution to all three Reynolds normal stresses becomes negligibly small at x/d = 40. The coherent contribution to u2 and v2 decays slower as moving downstream for a larger α, consistent with the slow decay of the coherent spanwise vorticity for a larger α.
ISSN: 0723-4864
EISSN: 1432-1114
DOI: 10.1007/s00348-011-1068-4
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