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Research Papers: CFD and VIV

Features of Vortex-Induced Vibration in Oscillatory Flow

[+] Author and Article Information
Shixiao Fu

e-mail: shixiao.fu@sjtu.edu.cn

Jungao Wang

State Key Laboratory of Ocean Engineering,
Shanghai Jiao Tong University,
Shanghai, China

Rolf Baarholm

Statoil,
Trondheim, Norway

Jie Wu

Marintek,
Trondheim, Norway

C. M. Larsen

Department of Marine Technology,
Centre for Ships and Ocean Structures, NTNU,
Trondheim, Norway

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 23, 2013; final manuscript received October 3, 2013; published online November 28, 2013. Assoc. Editor: Wei Qiu.

J. Offshore Mech. Arct. Eng 136(1), 011801 (Nov 28, 2013) (10 pages) Paper No: OMAE-13-1041; doi: 10.1115/1.4025759 History: Received April 23, 2013; Revised October 03, 2013

Vortex-induced vibration (VIV) in oscillatory flow is experimentally investigated in the ocean basin. The test flexible cylinder was forced to harmonically oscillate in various combinations of amplitude and period with Keulegan-Carpenter (KC) number between 26 and 178 in three different maximum reduced velocities, URmax=4, URmax=6.5, and URmax=7.9 separately. VIV responses at cross-flow (CF) direction are investigated using modal decomposition and wavelet transformation. The results show that VIV in oscillatory flow is quite different from that in steady flow; features, such as intermittent VIV, hysteresis, amplitude modulation, and mode transition (time sharing) are observed. Moreover, a VIV developing process including “building-up,” “lock-in,” and “dying-out” in oscillatory flow, is further proposed and analyzed.

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References

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Figures

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Fig. 1

Overview of the whole experimental setup

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Fig. 2

Simplified sketch of the setup

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Fig. 3

Detailed view of the end connection

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Fig. 4

Instrumentation of the model

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Fig. 5

A sample result plot

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Fig. 6

Typical VIV strain time history in oscillatory flow

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Fig. 7

Typical VIV strain time history in steady flow

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Fig. 8

Result of case (T = 16.5s,KC = 178) at CF4

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Fig. 9

Result of case (T = 2.5s,KC = 31) at CF4

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Fig. 10

Result of case (T = 10.2s,KC = 178) at CF4

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Fig. 11

Result of case (T = 1.8s,KC = 31) at CF4

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Fig. 12

Result of case (T = 8.45s,KC = 178) at CF4

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Fig. 13

Result of case (T = 1.45s,KC = 31) at CF4

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Fig. 14

Schematic diagram of obtaining A/D versus UR plot

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Fig. 15

Hysteresis in case (T = 16.5s,KC = 178) at CF4

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Fig. 16

Hysteresis in case (T = 10.2s,KC = 178) at CF4

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Fig. 17

Hysteresis in case (T = 8.45s,KC = 178) at CF4

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Fig. 18

VIV developing process of case (T = 16.5s,KC = 178) at CF4

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Fig. 19

Time interval distribution of VIV developing process when URmax = 4

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Fig. 20

VIV developing process of case (T = 10.2s,KC = 178) at CF4

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Fig. 21

Time interval distribution of VIV developing process when URmax = 6.5

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Fig. 22

VIV developing process of case (T = 8.45s,KC = 178) at CF2

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Fig. 23

Time interval distribution of VIV developing process when URmax = 7.9

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