Effects of spacing ratio on vortex-induced vibration of twin tandem diamond cylinders in a steady flow
- 1 April 2023
- journal article
- research article
- Published by AIP Publishing in Physics of Fluids
- Vol. 35 (4)
- https://doi.org/10.1063/5.0146395
Abstract
Vortex-induced vibration of twin tandem square cylinders at an inclined angle of 45{degree sign} to the fluid, i.e., twin diamond cylinders of mass ratio m*=3, is numerically investigated at Reynolds number Re=100 and reduced velocity Ur=3~18. This paper focuses on the effects of cylinders' spacing ratio L* (=L/B, where L is cylinders' center-to-center spacing, and B is the characteristic length) ranging from 2 to 6 on the oscillation responses of two-degree-of-freedom cylinders. The results indicate that the wake structure experiences two gap flow patterns, the reattachment and co-shedding regimes, and eight different wake modes. At a small spacing (L*=2~3), the reattachment regime occurs for the lower or higher Ur with the approximate range of 3 and 16~18. Meanwhile, the reattachment regime mainly occurs for other ranges of Ur at L*=2~6. The more significant oscillation of each spacing appears in the cross-flow direction, and the maximum cross-flow amplitude of the upstream cylinder is smaller than that of the downstream cylinder. Additionally, although significant cross-flow oscillations occur at small spacings (L*=2~3) with the Ur≈5~9 and 12~14, the intrinsic mechanisms are entirely different. As for the cross-flow oscillation characteristics of larger spacings (L*=4~6), they are virtually similar.Funding Information
- Key Program of National Natural Science Foundation of China (11932010)
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