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 arrangements, 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 Re 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
PAPER SUBMITTED: 1970-01-01
PAPER REVISED: 2024-12-09
PAPER ACCEPTED: 2024-12-12
PUBLISHED ONLINE: 2025-02-16
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