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Interactive Flow-Induced Vibrations of Two Staggered, Low Mass-Ratio Cylinders in the TrSL3 Flow Regime (2.5x10e4<Re<1.2x10e5): Smooth Cylinders

[+] Author and Article Information
Chunning Ji

Marine Renewable Energy Laboratory; University of Michigan Ann Arbor, MI, 48109-2145, USA; State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin, 30072, China
cnji@tju.edu.cn

Wanhai Xu

Marine Renewable Energy Laboratory; University of Michigan Ann Arbor, MI, 48109-2145, USA; State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin, 30072, China
xuwanhai@tju.edu.cn

Hai Sun

Marine Renewable Energy Laboratory; University of Michigan Ann Arbor, MI, 48109-2145, USA; College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin, 150001, China
hais@umich.edu

Rui Wang

Marine Renewable Energy Laboratory; University of Michigan Ann Arbor, MI, 48109-2145, USA
wanrui@umich.edu

Chunhui Ma

Marine Renewable Energy Laboratory; University of Michigan Ann Arbor, MI, 48109-2145, USA; Jiangsu Maritime Institute, Jiangsu, 211170, China
catch0226@163.com

Michael M. Bernitsas

Marine Renewable Energy Laboratory; University of Michigan Ann Arbor, MI, 48109-2145, USA; Dept. Naval Architecture & Marine Eng.; Dept. Mechanical Eng.; CTO Vortex Hydro Energy
michaelb@umich.edu

1Corresponding author.

ASME doi:10.1115/1.4038936 History: Received April 24, 2017; Revised December 13, 2017

Abstract

Flow-induced vibrations of two elastically mounted circular cylinders in staggered arrangement were experimentally investigated. The Reynolds number range for all experiments (2.5x104<Re<1.2x105) was in the TrSL3 (Transition in Shear Layer 3) flow regime. The oscillator parameters selected were: mass ratio m*=1.343 (ratio of oscillating mass to displaced fluid mass), spring stiffness K=250N/m, and damping ratio ?=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.

Copyright (c) 2017 by ASME
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