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Scaling of the time-mean characteristics in the polygonal cylinder near-wake

Wang, Q; Xu, S; Gan, L; Zhang, W; Zhou, Y

Scaling of the time-mean characteristics in the polygonal cylinder near-wake Thumbnail


Q Wang

S Xu

W Zhang

Y Zhou


The near wake of the polygonal cylinder with the side number N = 3 ~ ∞ is systematically studied based on particle image velocimetry (PIV) and load-cell measurements. Each cylinder is examined for two orientations, with either one leading side or leading corner. The Reynolds number Re = (1.0 ∼ 6.0) × 104 , defined by the longitudinally projected cylinder width. The dependence of the wake characteristic parameters on the cylinder orientation and N is discussed, and wake scaling analysis is conducted based on these parameters. It is found that the velocity deficit and half width of the wake scale well with the reverse flow zone length and recirculation bubble width, whilst the Strouhal number, drag and fluctuating lift coefficients scale well with the vortex formation length and wake width. The unveiled scaling relationships cast insight into the intrinsic physical connections between the aerodynamic forces and vortex formation and between the polygonal cylinder wakes of N = 3 ~ ∞, suggesting that the understanding of the time-mean wake behind individual polygonal cylinder can be unified to that of the circular cylinder wake.


Wang, Q., Xu, S., Gan, L., Zhang, W., & Zhou, Y. (2019). Scaling of the time-mean characteristics in the polygonal cylinder near-wake. Experiments in Fluids, 60, Article 181.

Journal Article Type Article
Acceptance Date Oct 25, 2019
Online Publication Date Nov 13, 2019
Publication Date Dec 31, 2019
Deposit Date Oct 27, 2019
Publicly Available Date Nov 13, 2020
Journal Experiments in Fluids
Print ISSN 0723-4864
Electronic ISSN 1432-1114
Publisher Springer
Peer Reviewed Peer Reviewed
Volume 60
Article Number 181


Accepted Journal Article (7.2 Mb)

Copyright Statement
This is a post-peer-review, pre-copyedit version of an article published in Experiments in Fluids. The final authenticated version is available online at:

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