NDLI: Streamwise Evolution of a Yawed-Cylinder Wake

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Wang, Hanfeng Zhou, Tongming
Copyright Year	2010
Abstract	The wake of a yawed circular cylinder was investigated by measuring all the velocity and vorticity components using an eight-wire vorticity probe. All experiments were performed at a Reynolds number of 7200. The tested yaw angle (α) is 0°, 15°, 30° and 45°. The measurements were conducted at different downstream positions to investigate the streamwise evolution of the wake. It is found that the effects of yaw angle on the coherent vorticity are negligibly small for α ≤ 15°. When α increases to 45°, the maximum of coherent spanwise vorticity reduces by about 50%, while that of streamwise vorticity increases by about 70%, indicating the suppression of spanwise vortices and the enhancement of three dimensionality of the wake with the increase of α. The streamwise decaying rate of the coherent spanwise vorticity is smaller for a larger α. It is because the streamwise spacing between the spanwise vortices is bigger for a larger α, thus this results in a weak interaction between the vortices and hence decays slowly. The coherent contribution to u2 and v2 decay slower for a larger yaw angle as moving downstream, consistent with the slowly streamwise decaying rate of ω˜z* for a larger yaw angle.
Sponsorship	Ocean, Offshore and Arctic Engineering Division
Starting Page	625
Ending Page	634
Page Count	10
File Format	PDF
ISBN	9780791849118
DOI	10.1115/OMAE2010-20207
e-ISBN	9780791838730
Volume Number	29th International Conference on Ocean, Offshore and Arctic Engineering: Volume 3
Conference Proceedings	ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering
Language	English
Publisher Date	2010-06-06
Publisher Place	Shanghai, China
Access Restriction	Subscribed
Subject Keyword	Vortices Reynolds number Vorticity Wakes Wire Probes Weak force Yaw Circular cylinders Cylinders
Content Type	Text
Resource Type	Article

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