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Streamwise Evolution of a Yawed-Cylinder Wake

[+] Author Affiliations
Hanfeng Wang

Central South University, ChangSha, China

Tongming Zhou

The University of Western Australia, WA, Australia

Paper No. OMAE2010-20207, pp. 625-634; 10 pages
doi:10.1115/OMAE2010-20207
From:
  • ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering
  • 29th International Conference on Ocean, Offshore and Arctic Engineering: Volume 3
  • Shanghai, China, June 6–11, 2010
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4911-8 | eISBN: 978-0-7918-3873-0
  • Copyright © 2010 by ASME

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 ω̃z * for a larger yaw angle.

Copyright © 2010 by ASME
Topics: Wakes , Cylinders

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