On the transition of the cylinder wake
作者:
Hong‐Quan Zhang,
Uwe Fey,
Bernd R. Noack,
Michael Ko¨nig,
Helmut Eckelmann,
期刊:
Physics of Fluids
(AIP Available online 1995)
卷期:
Volume 7,
issue 4
页码: 779-794
ISSN:1070-6631
年代: 1995
DOI:10.1063/1.868601
出版商: AIP
数据来源: AIP
摘要:
The transition of the cylinder wake is investigated experimentally in a water channel and is computed numerically using a finite‐difference scheme. Four physically different instabilities are observed: a local ‘‘vortex‐adhesion mode,’’ and three near‐wake instabilities, which are associated with three different spanwise wavelengths of approximately 1, 2, and 4 diam. All four instability processes can originate in a narrow Reynolds‐number interval between 160 and 230, and may give rise to different transition scenarios. Thus, Williamson’s [Phys. Fluids31, 3165 (1988)] experimental observation of a hard transition is for the first time numerically reproduced, and is found to be induced by the vortex‐adhesion mode. Without vortex adhesion, a soft onset of three‐dimensionality is numerically and experimentally obtained. A control‐wire technique is proposed, which suppresses transition up to a Reynolds number of 230. ©1995 American Institute of Physics.
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