THERMAL SCIENCE

International Scientific Journal

Yonghong Chen

,

Bangjun Lv

,

Yongsheng Su

,

Qi Song

,

Haibo Lian

NUMERICAL STUDY OF FLOW AROUND TWO TEARDROP CYLINDERS IN TANDEM ARRANGEMENT AT LOW REYNOLDS NUMBER

ABSTRACT
In this paper, the numerical method is used to investigate the flow around two tandem teardrop cylinders for four different arrangements at low Reynolds numbers. The influence of Reynolds number and spacing ratio on the drag, lift coefficient and Strouhal number are calculated and analyzed. The Reynolds number ranges from 50 to 200, while the spacing ratio ranges from 0 to 15. The results indicate that the Reynolds number has a more significant effect than the spacing ratio on the two tandem teardrop cylinders. Moreover, the influence of Reynolds number and spacing ratio on drag and lift coefficients can be divided into three regions. The drag and lift coefficients exhibit regular variations in the front and rear regions, and irregularly in the intermediate region, which are 140~170, 125~140, 80~125, and 125~140 at Reynolds number and concentrated in 2.4-2.8 £ S < 6 in spacing ratio for the four arrangements. A sudden increase present in both cylinders in all ar-rangements,except for the drag coefficient of the upstream cylinder which varies with Reynolds number. For a fixed spacing ratio or Reynolds numbers,constant vortex shedding is observed in cylinders with the various of Reynolds number or S. Arrangement A shows the latest onset of vortex shedding, regardless variations in the Reynolds number or the the spacing ratio. Additionally, intermittent vortex shedding is noted in Arrangements A and C before transitioning to a constant state. Overall, compared to the circular cylinders in tandem arrangement,the teardrop cylinders demonstrate superior flow characteristics. The results will provide a certain theoretical foundation for applications in engineering practice.
KEYWORDS
teardrop cylinders, tandem arrangement, drag coefficient, lift coefficient, Strouhal number, spacing ratio
PAPER SUBMITTED: 1970-01-01
PAPER REVISED: 2024-12-09
PAPER ACCEPTED: 2024-12-12
PUBLISHED ONLINE: 2025-02-16
DOI REFERENCE: https://doi.org/10.2298/TSCI240803009C
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2025, VOLUME 29, ISSUE Issue 4, PAGES [2743 - 2756]
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Numerical study of flow around two teardrop cylinders in tandem arrangement at low Reynolds number

2025 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence