PIV measurements of the near-wake behind a sinusoidal cylinder
SCIE
SCOPUS
- Title
- PIV measurements of the near-wake behind a sinusoidal cylinder
- Authors
- Zhang, W; Daichin; Lee, SJ
- Date Issued
- 2005-06
- Publisher
- SPRINGER
- Abstract
- The three-dimensional near-wake structures behind a sinusoidal cylinder have been investigated using a particle image velocimetry (PIV) measurement technique at Re=3,000. The mean velocity fields and spatial distributions of ensemble-averaged turbulence statistics for flows around the sinusoidal and corresponding smooth cylinders were compared. The near-wake behind the sinusoidal cylinder exhibited pronounced spanwise periodic variations in the flow structure. Well-organized streamwise vortices with alternating positive and negative vorticity were observed along the span of the sinusoidal cylinder. They suppress the formation of the large-scale spanwise vortices and decrease the overall turbulent kinetic energy in the near-wake of the sinusoidal cylinder. The sinusoidal surface geometry significantly modifies the near-wake structure and strongly controls the three-dimensional vortices formed in the near-wake.
- Keywords
- BLUFF-BODY; WAVY CYLINDER; VORTICES; REDUCTION; DRAG
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/24552
- DOI
- 10.1007/s00348-005-0981-9
- ISSN
- 0723-4864
- Article Type
- Article
- Citation
- EXPERIMENTS IN FLUIDS, vol. 38, no. 6, page. 824 - 832, 2005-06
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