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Research Papers: CFD and VIV

Numerical Study on the Effect of Tandem Spacing on Flow-Induced Motions of Two Cylinders With Passive Turbulence Control

[+] Author and Article Information
Lin Ding

Key Laboratory of Low-Grade Energy Utilization
Technologies and Systems of Ministry of Education of China,
Chongqing University,
174 Shazheng Street,
Shapingba District,
Chongqing 400044, China
e-mail: linding@cqu.edu.cn

Li Zhang

Key Laboratory of Low-Grade Energy Utilization
Technologies and Systems of Ministry of Education of China,
Chongqing University,
174 Shazheng Street,
Shapingba District,
Chongqing 400044, China
e-mail: lizhang@cqu.edu.cn

Chunmei Wu

Key Laboratory of Low-Grade Energy Utilization
Technologies and Systems of Ministry of Education of China,
Chongqing University,
174 Shazheng Street,
Shapingba District,
Chongqing 400044, China
e-mail: chunmeiwu@cqu.edu.cn

Eun Soo Kim

Marine Renewable Energy Laboratory,
Department of Naval Architecture and
Marine Engineering,
University of Michigan,
2600 Draper,
Ann Arbor, MI 48109
e-mail: bblwith@umich.edu

Michael M. Bernitsas

Marine Renewable Energy Laboratory,
Department of Naval Architecture and
Marine Engineering,
University of Michigan,
2600 Draper,
Ann Arbor, MI 48109
e-mail: michaelb@umich.edu

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received March 17, 2015; final manuscript received August 19, 2016; published online October 21, 2016. Assoc. Editor: Wei Qiu.

J. Offshore Mech. Arct. Eng 139(2), 021801 (Oct 21, 2016) (8 pages) Paper No: OMAE-15-1028; doi: 10.1115/1.4034760 History: Received March 17, 2015; Revised August 19, 2016

The effect of tandem spacing on the flow-induced motions (FIM) of two circular cylinders with passive turbulence control is investigated using two-dimensional (2D) unsteady Reynolds-averaged Navier–Stokes equations with the Spalart–Allmaras turbulence model. Results are compared to experiments in the range of Reynolds number of 30,000 < Re < 100,000. The center-to-center spacing between the two cylinders is varied from 2 to 6 diameters. Simulation results predict well all the ranges of FIM including vortex-induced vibrations (VIV) and galloping and match well with experimental measurements. For the upstream cylinder, the amplitude and frequency responses are not considerably influenced by the downstream cylinder when the spacing is greater than 2D. For the downstream cylinder, a rising amplitude trend in the VIV upper-branch can be observed in all the cases as is typical of flows in the TrSL3 flow regime (transition in shear layer 3; 2 × 104 < Re < 3 × 105). The galloping branch merges with the VIV upper-branch for spacing greater than three-dimensional (3D). Vortex structures show significant variation in different flow regimes in accordance with experimental observations. High-resolution postprocessing shows that the interaction between the wakes of cylinders results in various types of FIM.

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Figures

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Fig. 2

Computational domain

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Fig. 3

Close-up of medium resolution grid

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Fig. 4

Amplitude and frequency ratios of the first cylinder at different spacing

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Fig. 5

Amplitude and frequency ratios of the second cylinder at different spacing

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Fig. 6

Vortex structures of two PTC-cylinders with different spacing at Re = 30,000: (a) d = 2D, (b) d = 2.5D, (c) d = 3D, (d) d = 4D, (e) d = 5D, and (f) d = 6D

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Fig. 7

Vortex structures of two PTC-cylinders with different spacing at Re = 60,000: (a) d = 2D, (b) d = 2.5D, (c) d = 3D, (d) d = 4D, (e) d = 5D, and (f) d = 6D

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Fig. 8

Vortex structures of two PTC-cylinders with different spacing at Re = 90,000: (a) d = 2D, (b) d = 2.5D, (c) d = 3D, (d) d = 4D, (e) d = 5D, and (f) d = 6D

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