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Research Papers: Ocean Renewable Energy

Phase Averaged Flow Analysis in an Oscillating Water Column Wave Energy Converter

[+] Author and Article Information
Alan Fleming

e-mail: alanf@amc.edu.au

Neil Bose

Australian Maritime College,
University of Tasmania,
Launceston, TAS, Australia

Tom Denniss

Oceanlinx,
Sydney, NSW, Australia

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 1, 2011; final manuscript received June 5, 2012; published online February 25, 2013. Assoc. Editor: Wei Qiu.

J. Offshore Mech. Arct. Eng 135(2), 021901 (Feb 25, 2013) (9 pages) Paper No: OMAE-11-1056; doi: 10.1115/1.4007076 History: Received July 01, 2011; Revised June 05, 2012

This paper presents the application of phase averaging to experimental data obtained during scale model testing of a forward facing bent duct oscillating water column (OWC). Phase averaging is applied to both wave probe data and a two-dimensional velocity field at the centerline plane of the OWC model obtained using particle imaging velocimetry (PIV). Results are presented for one monochromatic wave condition. The influence of varied wave frequency is briefly discussed.

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Figures

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Fig. 1

Experimental setup, including PIV apparatus mounted in front of the window of the towing tank

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Fig. 2

Location of wave probes inside OWC chamber (looking down) with waves approaching from the top

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Fig. 3

Locations of different FOV for PIV data acquisition during experiment

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Fig. 4

Visual representation of the division of time series data into segments for phase averaging

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Fig. 5

Phase averaged elevations for wave condition H = 0.07 m and f = 0.44 Hz

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Fig. 6

Phase averaged surface profile at the centerline plane inside the OWC chamber for the wave condition H = 0.07 m and f = 0.44 Hz the phase; (t/T) is shown in the legend

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Fig. 7

Phase averaged surface profile at the centerline plane inside the OWC chamber for the wave condition H = 0.07 m and f = 0.77 Hz the phase; (t/T) is shown in the legend

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Fig. 8

Velocity field inside and outside the OWC device with 1/2 of vectors hidden for clarity (H=0.07 m and f=0.44 Hz)

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Fig. 9

Velocity and vorticity field inside and outside the OWC device for the first half of cycle with 3/4 of vectors hidden for clarity (H=0.07 m and f=0.44 Hz)

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Fig. 10

Velocity and vorticity field inside and outside the OWC device for the second half of cycle with 3/4 of vectors hidden for clarity (H=0.07 m and f=0.44 Hz)

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Fig. 11

Comparison of kinetic energy of an undisturbed flow field with the OWC flow field (H=0.07 m and f=0.44 Hz)

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