Breakdown and Rearrangement of Vortex Streets in a Far Wake

Takashi Karasudani, Mitsuaki Funakoshi, Masayuki Oikawa

研究成果: Contribution to journalArticle査読

6 被引用数 (Scopus)

抄録

Breakdown and rearrangement of regular vortex streets in the wake of a circular cylinder are examined experimentally. The evolution of vorticity field is obtained using digital image processing for visualized flow fields. For 100ÃJRÃ140 (R is the Reynolds number based on the velocity U0 and diameter of the cylinder) a primary vortex street evolves to a parallel shear flow of Gaussian profile due to anisotropic extension of the vortex regions. Subsequently a secondary vortex street of larger scale appears. Its wavelength is within the instability region in the linear stability theory for the above velocity profile. The wavelength is, however, considerably smaller than that of the most unstable mode. Finally it is shown that the vortex regions in the primary and secondary vortex streets move at the speeds 0.15U0~0.19U0 and 0.05U0~0.10U0 respectively, relative to the fluid at infinity.

本文言語英語
ページ(範囲)1497-1500
ページ数4
ジャーナルjournal of the physical society of japan
58
5
DOI
出版ステータス出版済み - 1 1 1989

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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