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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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References

Müller, G., and Whittaker, T., 1995, “Visualisation of Flow Conditions Inside a Shoreline Wave Power-Station,” Ocean Eng., 22(6), pp. 629–641. [CrossRef]
Folley, M., and Whittaker, T., 2002, “Identification of Non-Linear Flow Characteristics of the Limpet Shoreline OWC,” Proceedings of the 12th International Offshore and Polar Engineering Conference, Kitakyushu, Japan, May 26–31, 2001, International Society of Offshore and Polar Engineers, pp. 541–546.
Morrison, I. G., 1995, “The Hydrodynamic Performance of an Oscillating Water Column Wave Energy Converter,” Ph.D. thesis, University of Edinburgh, Edinburgh, UK.
Graw, K. U., Schimmels, S., and Lengricht, J., 2000, “Quantifying Losses Around the Lip of an OWC by Use of Particle Image Velocimetry (PIV),” LACER-Leipzig Annual Civil Engineering Report, Aalborg, Denmark.
Imai, Y., Toyota, K., Nagata, S., Setoguchi, T., Oda, J., Matsunaga, N., and Shimozono, T., 2008, “An Experimental Study of Negative Drift Force Acting on a Floating OWC ‘Backward Bent Duct Buoy’,” ASME Conference Proceedings, pp. 871–879. [CrossRef]
Longo, J., Shao, J., Irvine, M., and Stern, F., 2007, “Phase-Averaged PIV for the Nominal Wake of a Surface Ship in Regular Head Waves,” ASME J. Fluids Eng., 129(5), pp. 524–540. [CrossRef]
Evans, D. V., 1978, “The Oscillating Water Column Wave-Energy Device,” IMA J. Appl. Math., 22(4), pp. 423–433. [CrossRef]
LaVision GmbH, 2009, Product-Manual for DaVis 7.2, LaVision GmbH, Göttingen, Germany.
ITTC, 2008, ITTC Guide 7.5-02-01-01, Revision 01, “Guide to the Expression of Uncertainty in Experimental Hydrodynamics.”
ITTC, 2008, ITTC Procedure 7.5-01-03-03, “Uncertainty Analysis: Particle Imaging Velocimetry.”
Cruz, J., ed., 2008, Ocean Wave Energy: Current Status and Future Perspectives, Springer Verlag, Berlin.

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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