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Research Papers: Ocean Renewable Energy

Analytical and Numerical Study of Nearshore Multiple Oscillating Water Columns

[+] Author and Article Information
Kourosh Rezanejad, Joydip Bhattacharjee

Centre for Marine Technology and
Ocean Engineering (CENTEC),
Instituto Superior Técnico,
Universidade de Lisboa,
1049-001 Lisbon, Portugal

Carlos Guedes Soares

Centre for Marine Technology and
Ocean Engineering (CENTEC),
Instituto Superior Técnico,
Universidade de Lisboa,
1049-001 Lisbon, Portugal
e-mail: c.guedes.soares@centec.tecnico.ulisboa.pt

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 September 13, 2014; final manuscript received October 30, 2015; published online February 3, 2016. Assoc. Editor: Hideyuki Suzuki.

J. Offshore Mech. Arct. Eng 138(2), 021901 (Feb 03, 2016) (7 pages) Paper No: OMAE-14-1127; doi: 10.1115/1.4032303 History: Received September 13, 2014; Revised October 30, 2015

In the present study, the performance of two chamber nearshore oscillating water columns (OWCs) in finite water depth is analyzed based on the linearized water wave theory in the two-dimensional Cartesian coordinate systems. The barriers are assumed to be fixed and the turbine characteristics are assumed linear with respect to the fluctuations of volume flux and pressure inside the chamber. The free surface inside the chambers is modeled as a nonplane wave surface. Two different mathematical models are employed to solve the hydrodynamic problem: the semi-analytic method of matched eigenfunction expansion and the numerical scheme of boundary integral equation method (BIEM). The numerical results are compared with the semi-analytic results and show good agreement. The effects of the distance between the barriers and the length of the barriers on the efficiency of the OWC device are investigated. The results of two chambers OWC are also compared with the results for an equivalent single OWC chamber. Further, the effect of the water depth on the capacity of the wave power absorption is discussed.

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Figures

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Fig. 1

Schematic diagram of the two-chamber OWC

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Fig. 2

Three separate numerical solution regions interfaced in barriers of OWC

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Fig. 3

Efficiency is plotted versus nondimensional wave period for different a1/h=a2/h values with h=4m, b1=2m, b2=4m

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Fig. 4

Efficiency is plotted versus nondimensional frequency for different b1/b2 values with h=4m, b2=4m, a1=a2=2m

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Fig. 5

Efficiency is plotted versus time period for different values of h with a1=a2=0.5m, b1=2m, b2=4m

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Fig. 6

Efficiency is plotted versus nondimensional frequency for different a1/h and a2/h with h=4m, b1=2m, b2=4m

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