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Vortex shedding from tandem cylinders

Alam, Md. Mahbub and Elimer, Mehdi and Longjun, Wang and Lo Jacono, David and Wong, CW Vortex shedding from tandem cylinders. (2018) Experiments in Fluids, 59 (60). 1-17. ISSN 0723-4864

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Official URL: http://dx.doi.org/10.1007/s00348-018-2501-8

Abstract

An experimental investigation is conducted on the ow around tandem cylinders for ranges of diameter ratio d/D = 0.25–1.0, spacing ratio L/d = 5.5–20, and Reynolds number Re = 0.8 × 104–2.42 × 104, where d and D are the diameters of the upstream and downstream cylinders, respectively, L is the distance from the upstream cylinder center to the forward stagnation point of the downstream one. The focus is given on examining the effects of d/D, L/d and Re on Strouhal number St, flow structures and fluid forces measured using hotwire, particle image velocimetry (PIV) and load cell measurement techniques, respectively. Changes in d/D and L/d in the ranges examined lead to five flow regimes, namely lock-in, intermittent lock-in, no lock-in, subharmonic lock-in and shear-layer reattachment regimes. Time-mean drag coefficient (CD) and fluctuating drag and lift coefficients (CD' and CL′ ) are more sensitive to L/d than d/D. The scenario is opposite for St where d/D is more prominent than L/d to change the St. The detailed facet of the dependence on d/D and L/d of CD, CD′, CL′ and St is discussed based on shear-layer velocity, approaching velocity, vortex formation length, and wake width.

Item Type:Article
Additional Information:Thanks to Springer editor. The original PDF of the article can be found at https://link.springer.com/article/10.1007/s00348-018-2501-8
HAL Id:hal-01730852
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Harbin Institute of Technology (CHINA)
Laboratory name:
Funders:
National Natural Science Foundation of China
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Deposited On:13 Mar 2018 15:07

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