Mapping of the flow structure and hydrodynamic properties of a round-ended cylinder

Hongjun Zhu, Bing Xu, Yue Gao, Ming Zhao, Wanhai Xu, Tongming Zhou

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

This paper reports the numerical results of flow past a round-ended cylinder with various incidence angles in a low Reynolds number range of Re = 60-160. Mapping of the flow structure and hydrodynamic properties is examined in the incidence angle range of α = 0°-90° with increment of 15°. Three wake patterns are identified, including the steady and symmetric wake without vortex shedding (Pattern I), the Karman vortex street (Pattern II), and the Karman vortex street with the occurrence of subordinate vortex (Pattern III). The reattachment of boundary layers results in the occurrence of a subordinate vortex and hence the non-single-frequency fluctuation of hydrodynamic coefficients (CL and CD, which are lift and drag coefficients, respectively). Elliptical and figure-eight CL-CD curves are observed, depending on the frequency ratios of the two coefficients and their weights. Non-zero time-averaged CL occurs when 0° < α < 90°, due to the asymmetric boundary layer separation. The backward migration of boundary layer separation point contributes to the reduction of frictional drag and the vortex formation length.

Original languageEnglish
Article number073602
JournalPhysics of Fluids
Volume35
Issue number7
DOIs
Publication statusPublished - 1 Jul 2023

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