Three-dimensional structure of longitudinal vortices shedding from cruciform two-cylinder systems with different geometries
Abstract: In previous research the present authors have shown that cross flow vibrations can be induced on a cylinder by setting another cylindrical body downstream in cruciform arrangement with a certain gap s between them. These vibrations are excited by two longitudinal vortices (LVs), i.e. the t...
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my.utm.766732018-04-30T13:48:46Z http://eprints.utm.my/id/eprint/76673/ Three-dimensional structure of longitudinal vortices shedding from cruciform two-cylinder systems with different geometries Koide, M. Takahashi, T. Shirakashi, M. Salim, S. A. Z. B. S. TJ Mechanical engineering and machinery Abstract: In previous research the present authors have shown that cross flow vibrations can be induced on a cylinder by setting another cylindrical body downstream in cruciform arrangement with a certain gap s between them. These vibrations are excited by two longitudinal vortices (LVs), i.e. the trailing vortex (TV) and the necklace vortex (NV), shedding periodically near the cross of the system. In this study, LVs shedding from three cruciform systems, i.e. circular-cylinder/circular-cylinder (CC/CC), circular-cylinder/strip-plate (CC/SP) and square-cylinder/strip-plate (SC/SP) system, are observed from three directions using water tunnel and surface-die-streak technique to clarify their three-dimensional structure. The gap-to-diameter ratio s/d is set at 0.08 or 0.28 as the representative values of TV and NV, respectively. Formation of TV or NV depends on the system geometry s/d and Reynolds number Re. In the case of CC/CC, TV is formed at s/d = 0.08 and NV at s/d = 0.28 steadily when 1400 ≤ Re ≤ 2000, and they shed periodically when 3300 ≤ Re ≤ 5700. In the case of CC/SP, steady shedding of TV is observed at the both values of s/d in the lower Re range and periodic shedding is observed only for TV at s/d = 0.08 in the higher Re range, but with poorer periodicity. In the case of SC/SP, NV is formed at the both values of s/d and periodic shedding is not observed up to the highest value of Re = 5000 in this experiment. Springer Verlag 2017 Article PeerReviewed Koide, M. and Takahashi, T. and Shirakashi, M. and Salim, S. A. Z. B. S. (2017) Three-dimensional structure of longitudinal vortices shedding from cruciform two-cylinder systems with different geometries. Journal of Visualization, 20 (4). pp. 753-763. ISSN 1343-8875 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85013046129&doi=10.1007%2fs12650-017-0419-5&partnerID=40&md5=c2bfa7a94a09af0132e5208d9745ca53 DOI:10.1007/s12650-017-0419-5 |
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TJ Mechanical engineering and machinery Koide, M. Takahashi, T. Shirakashi, M. Salim, S. A. Z. B. S. Three-dimensional structure of longitudinal vortices shedding from cruciform two-cylinder systems with different geometries |
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Abstract: In previous research the present authors have shown that cross flow vibrations can be induced on a cylinder by setting another cylindrical body downstream in cruciform arrangement with a certain gap s between them. These vibrations are excited by two longitudinal vortices (LVs), i.e. the trailing vortex (TV) and the necklace vortex (NV), shedding periodically near the cross of the system. In this study, LVs shedding from three cruciform systems, i.e. circular-cylinder/circular-cylinder (CC/CC), circular-cylinder/strip-plate (CC/SP) and square-cylinder/strip-plate (SC/SP) system, are observed from three directions using water tunnel and surface-die-streak technique to clarify their three-dimensional structure. The gap-to-diameter ratio s/d is set at 0.08 or 0.28 as the representative values of TV and NV, respectively. Formation of TV or NV depends on the system geometry s/d and Reynolds number Re. In the case of CC/CC, TV is formed at s/d = 0.08 and NV at s/d = 0.28 steadily when 1400 ≤ Re ≤ 2000, and they shed periodically when 3300 ≤ Re ≤ 5700. In the case of CC/SP, steady shedding of TV is observed at the both values of s/d in the lower Re range and periodic shedding is observed only for TV at s/d = 0.08 in the higher Re range, but with poorer periodicity. In the case of SC/SP, NV is formed at the both values of s/d and periodic shedding is not observed up to the highest value of Re = 5000 in this experiment. |
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Article |
author |
Koide, M. Takahashi, T. Shirakashi, M. Salim, S. A. Z. B. S. |
author_facet |
Koide, M. Takahashi, T. Shirakashi, M. Salim, S. A. Z. B. S. |
author_sort |
Koide, M. |
title |
Three-dimensional structure of longitudinal vortices shedding from cruciform two-cylinder systems with different geometries |
title_short |
Three-dimensional structure of longitudinal vortices shedding from cruciform two-cylinder systems with different geometries |
title_full |
Three-dimensional structure of longitudinal vortices shedding from cruciform two-cylinder systems with different geometries |
title_fullStr |
Three-dimensional structure of longitudinal vortices shedding from cruciform two-cylinder systems with different geometries |
title_full_unstemmed |
Three-dimensional structure of longitudinal vortices shedding from cruciform two-cylinder systems with different geometries |
title_sort |
three-dimensional structure of longitudinal vortices shedding from cruciform two-cylinder systems with different geometries |
publisher |
Springer Verlag |
publishDate |
2017 |
url |
http://eprints.utm.my/id/eprint/76673/ https://www.scopus.com/inward/record.uri?eid=2-s2.0-85013046129&doi=10.1007%2fs12650-017-0419-5&partnerID=40&md5=c2bfa7a94a09af0132e5208d9745ca53 |
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13.1944895 |