Flow structure around a finite circular cylinder embedded in various atmospheric boundary layers
SCIE
SCOPUS
- Title
- Flow structure around a finite circular cylinder embedded in various atmospheric boundary layers
- Authors
- Park, CW; Lee, SJ
- Date Issued
- 2002-04
- Publisher
- ELSEVIER SCIENCE BV
- Abstract
- The flow structure around the free end of a finite circular cylinder (FC) embedded in various atmospheric boundary layers (ABLs) was investigated experimentally. The experiments were carried out in a closed-return type subsonic wind tunnel with various oncoming ABLs. A finite circular cylinder with an aspect ratio (L/D) of 6 was mounted vertically on a flat plate. The Reynolds number based on the cylinder diameter is similar to Re = 20, 000. The wake structure behind a cylinder located in a uniform flow condition was also measured for comparison. A hot-wire anemometer was employed to measure the wake velocity, and mean pressure distributions on the cylinder surface were also measured. The flow past the FC free end exhibits a complicated three-dimensional wake structure, and the flow structure is quite different from that of a two-dimensional cylinder. The three-dimensional flow structure seems to arise from the strong entrainment of irrotational fluids caused by the downwash counter-rotating vortices separated from the FC free end. The vortex-shedding frequency and vortex-formation length are lower for an FC immersed in ABLs compared with those in a uniform flow. Spectral analysis revealed that a peculiar flow structure with a 24 Hz frequency component closely related to the counter-rotating twin-vortex exists near the FC free end. (C) 2002 Published by The Japan Society of Fluid Mechanics and Elsevier Science B.V. All rights reserved.
- Keywords
- finite cylinder (FC); free end; atmospheric boundary layer; flow structure; counter-rotating twin-vortex; LOW REYNOLDS-NUMBERS; ASPECT RATIO; WAKE; UNIFORM; LENGTH; PAST
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/19087
- DOI
- 10.1016/S0169-5983(02)00037-0
- ISSN
- 0169-5983
- Article Type
- Article
- Citation
- FLUID DYNAMICS RESEARCH, vol. 30, no. 4, page. 197 - 215, 2002-04
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