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Research Papers: CFD and VIV

Multicylinder Flow-Induced Motions: Enhancement by Passive Turbulence Control at 28,000<Re<120,000

[+] Author and Article Information
Eun Soo Kim

Graduate Research Student Assistant
Department of Mechanical Engineering,
University of Michigan,
2600 Draper,
Ann Arbor, MI 48109-2145

e-mail: bblwith@umich.edu

Michael M. Bernitsas

Professor
ASME Life Fellow
Department of Naval Architecture and Marine Engineering,

Department of Mechanical Engineering,
University of Michigan,
2600 Draper,
Ann Arbor, MI 48109-2145;
CTO, Vortex Hydro Energy,
7444 Dexter,
Ann Arbor, MI 48130
e-mail: michaelb@umich.edu

R. Ajith Kumar

Professor
AMRITA University,Amritapuri Campus,
Kerala State, 690525, India
e-mail: r_ajithkumar@am.amrita.edu

Contributed by the Ocean Offshore and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received July 29, 2011; final manuscript received April 28, 2012; published online February 25, 2013. Assoc. Editor: Sergio H. Sphaier.

J. Offshore Mech. Arct. Eng 135(2), 021802 (Feb 25, 2013) (11 pages) Paper No: OMAE-11-1069; doi: 10.1115/1.4007052 History: Received July 29, 2011; Revised April 28, 2012

The VIVACE converter was introduced at OMAE2006 as a single, smooth, circular-cylinder module. The hydrodynamics of VIVACE is being improved continuously to achieve higher density in harnessed hydrokinetic power. Intercylinder spacing and passive turbulence control (PTC) through selectively located roughness are effective tools in enhancement of flow induced motions (FIMs) under high damping for power harnessing. Single cylinders harness energy at high density even in 1 knot currents. For downstream cylinders, questions were raised on energy availability and sustainability of high-amplitude FIM. Through PTC and intercylinder spacing, strongly synergetic FIMs of 2/3/4 cylinders are achieved. Two-cylinder smooth/PTC, and three/four-cylinder PTC systems are tested experimentally. Using the “PTC-to-FIM” map developed in previous work at the Marine Renewable Energy Laboratory (MRELab), PTC is applied and cylinder response is measured for inflow center-to-center distance 2D-5D (D = diameter), transverse center-to-center distance 0.5–1.5 D, Re ε [28,000–120,000], m* ε [1.677–1.690], U ε [0.36–1.45 m/s], aspect ratio l/D = 10.29, and m*ζ ε [0.0283–0.0346]. All experiments are conducted in the low turbulence free surface water (LTFSW) channel of MRELab. Amplitude spectra and broad field-of-view (FOV) visualization help reveal complex flow structures and cylinder interference undergoing VIV, interference/ proximity/wake/soft/hard galloping. FIM amplitudes of 2.2–2.8D are achieved for all cylinders in steady flow for all parameter ranges tested.

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Figures

Grahic Jump Location
Fig. 1

(a) Schematic of a single-cylinder VIVACE converter (left); (b) four-cylinders VIVACE converter in the LTFSW channel (right)

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Fig. 2

A/D of two smooth cylinders in tandem

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Fig. 3

f* = fosc/fn,w of two smooth cylinders in tandem

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Fig. 4

A/D of two cylinders in tandem with variable PTC

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Fig. 5

f* = fosc/fn,w of two cylinders in tandem with variable locations of PTC

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Fig. 6

A/D of two cylinders with PTC and variable distances

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Fig. 7

fosc of two cylinders with PTC and variable distances

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Fig. 8

A/D of two cylinders with PTC and variable staggerings

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Fig. 9

fosc of two cylinders with PTC and variable staggerings

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Fig. 10

A/D of three cylinders with PTC in tandem

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Fig. 11

fosc of three cylinders with PTC in tandem

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Fig. 12

A/D of four cylinders with PTC in tandem

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Fig. 13

fosc of four cylinders with PTC in tandem

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Fig. 14

Transition of fosc in the second cylinder with PTC in tandem

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