Flow-induced vibrations (FIVs) of two elastically mounted circular cylinders in staggered arrangement were experimentally investigated. The Reynolds number range for all experiments (2.5 × 104 < Re < 1.2 × 105) was in the transition in shear layer 3 (TrSL3) flow regime. The oscillator parameters selected were: mass ratio m* = 1.343 (ratio of oscillating mass to displaced fluid mass), spring stiffness K = 250 N/m, and damping ratio ζ = 0.02. The experiments were conducted in the low turbulence free surface water (LTFSW) channel in the MRELab of the University of Michigan. A closed-loop, virtual spring–damper system (Vck) was used to facilitate quick and accurate parameter setting. Based on the characteristics of the displacement response, five vibration patterns were identified and their corresponding regions in the parametric plane of the in-flow spacing (1.57 < L/D < 4.57) and transverse cylinder spacing (0 < T/D < 2) were defined. The hydrodynamic forces and frequency characteristics of the vibration response are also discussed.
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August 2018
Research-Article
Interactive Flow-Induced Vibrations of Two Staggered, Low Mass-Ratio Cylinders in the TrSL3 Flow Regime (2.5 × 104 < Re < 1.2 × 105): Smooth Cylinders
Chunning Ji,
Chunning Ji
Marine Renewable Energy Laboratory,
University of Michigan,
Ann Arbor, MI 48109-2145;
University of Michigan,
Ann Arbor, MI 48109-2145;
State Key Laboratory of Hydraulic Engineering
Simulation and Safety,
Tianjin University,
Tianjin 30072, China
e-mail: cnji@tju.edu.cn
Simulation and Safety,
Tianjin University,
Tianjin 30072, China
e-mail: cnji@tju.edu.cn
Search for other works by this author on:
Wanhai Xu,
Wanhai Xu
Marine Renewable Energy Laboratory,
University of Michigan,
Ann Arbor, MI 48109-2145;
University of Michigan,
Ann Arbor, MI 48109-2145;
State Key Laboratory of Hydraulic Engineering
Simulation and Safety,
Tianjin University,
Tianjin 30072, China
e-mail: xuwanhai@tju.edu.cn
Simulation and Safety,
Tianjin University,
Tianjin 30072, China
e-mail: xuwanhai@tju.edu.cn
Search for other works by this author on:
Hai Sun,
Hai Sun
Marine Renewable Energy Laboratory,
University of Michigan,
Ann Arbor, MI 48109-2145;
University of Michigan,
Ann Arbor, MI 48109-2145;
College of Aerospace and Civil Engineering,
Harbin Engineering University,
Harbin 150001, China
e-mail: hais@umich.edu
Harbin Engineering University,
Harbin 150001, China
e-mail: hais@umich.edu
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Rui Wang,
Rui Wang
Marine Renewable Energy Laboratory,
University of Michigan,
Ann Arbor, MI 48109-2145
e-mail: wanrui@umich.edu
University of Michigan,
Ann Arbor, MI 48109-2145
e-mail: wanrui@umich.edu
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Chunhui Ma,
Chunhui Ma
Marine Renewable Energy Laboratory,
University of Michigan,
Ann Arbor, MI 48109-2145;
University of Michigan,
Ann Arbor, MI 48109-2145;
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Michael M. Bernitsas
Michael M. Bernitsas
Marine Renewable Energy Laboratory,
University of Michigan,
Ann Arbor, MI 48109-2145;
University of Michigan,
Ann Arbor, MI 48109-2145;
Department of Naval Architecture and Marine
Engineering,
CTO Vortex Hydro Energy,
Ann Arbor, MI 48109;
Engineering,
CTO Vortex Hydro Energy,
Ann Arbor, MI 48109;
Department of Mechanical Engineering,
CTO Vortex Hydro Energy,
Ann Arbor, MI 48108
e-mail: michaelb@umich.edu
CTO Vortex Hydro Energy,
Ann Arbor, MI 48108
e-mail: michaelb@umich.edu
Search for other works by this author on:
Chunning Ji
Marine Renewable Energy Laboratory,
University of Michigan,
Ann Arbor, MI 48109-2145;
University of Michigan,
Ann Arbor, MI 48109-2145;
State Key Laboratory of Hydraulic Engineering
Simulation and Safety,
Tianjin University,
Tianjin 30072, China
e-mail: cnji@tju.edu.cn
Simulation and Safety,
Tianjin University,
Tianjin 30072, China
e-mail: cnji@tju.edu.cn
Wanhai Xu
Marine Renewable Energy Laboratory,
University of Michigan,
Ann Arbor, MI 48109-2145;
University of Michigan,
Ann Arbor, MI 48109-2145;
State Key Laboratory of Hydraulic Engineering
Simulation and Safety,
Tianjin University,
Tianjin 30072, China
e-mail: xuwanhai@tju.edu.cn
Simulation and Safety,
Tianjin University,
Tianjin 30072, China
e-mail: xuwanhai@tju.edu.cn
Hai Sun
Marine Renewable Energy Laboratory,
University of Michigan,
Ann Arbor, MI 48109-2145;
University of Michigan,
Ann Arbor, MI 48109-2145;
College of Aerospace and Civil Engineering,
Harbin Engineering University,
Harbin 150001, China
e-mail: hais@umich.edu
Harbin Engineering University,
Harbin 150001, China
e-mail: hais@umich.edu
Rui Wang
Marine Renewable Energy Laboratory,
University of Michigan,
Ann Arbor, MI 48109-2145
e-mail: wanrui@umich.edu
University of Michigan,
Ann Arbor, MI 48109-2145
e-mail: wanrui@umich.edu
Chunhui Ma
Marine Renewable Energy Laboratory,
University of Michigan,
Ann Arbor, MI 48109-2145;
University of Michigan,
Ann Arbor, MI 48109-2145;
Michael M. Bernitsas
Marine Renewable Energy Laboratory,
University of Michigan,
Ann Arbor, MI 48109-2145;
University of Michigan,
Ann Arbor, MI 48109-2145;
Department of Naval Architecture and Marine
Engineering,
CTO Vortex Hydro Energy,
Ann Arbor, MI 48109;
Engineering,
CTO Vortex Hydro Energy,
Ann Arbor, MI 48109;
Department of Mechanical Engineering,
CTO Vortex Hydro Energy,
Ann Arbor, MI 48108
e-mail: michaelb@umich.edu
CTO Vortex Hydro Energy,
Ann Arbor, MI 48108
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 April 24, 2017; final manuscript received December 13, 2017; published online February 22, 2018. Assoc. Editor: Yi-Hsiang Yu.
J. Offshore Mech. Arct. Eng. Aug 2018, 140(4): 041801 (9 pages)
Published Online: February 22, 2018
Article history
Received:
April 24, 2017
Revised:
December 13, 2017
Citation
Ji, C., Xu, W., Sun, H., Wang, R., Ma, C., and Bernitsas, M. M. (February 22, 2018). "Interactive Flow-Induced Vibrations of Two Staggered, Low Mass-Ratio Cylinders in the TrSL3 Flow Regime (2.5 × 104 < Re < 1.2 × 105): Smooth Cylinders." ASME. J. Offshore Mech. Arct. Eng. August 2018; 140(4): 041801. https://doi.org/10.1115/1.4038936
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