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http://dx.doi.org/10.9765/KSCOE.2018.30.6.242

3-Dimensional Numerical Analysis of Air Flow inside OWC Type WEC Equipped with Channel of Seawater Exchange and Wave Characteristics around Its Structure (in Case of Regular Waves)  

Lee, Kwang Ho (Dept. of Energy and Plant Eng., Catholic Kwandong University)
Lee, Jun Hyeong (Dept. of Civil and Environmental Eng., Graduate School, Korea Maritime and Ocean University)
Jeong, Ik Han (Dept. of Civil and Environmental Eng., Graduate School, Korea Maritime and Ocean University)
Kim, Do Sam (Dept. of Civil Eng., Korea Maritime and Ocean Univ.)
Publication Information
Journal of Korean Society of Coastal and Ocean Engineers / v.30, no.6, 2018 , pp. 242-252 More about this Journal
Abstract
It is well known that an Oscillating Water Column Wave Energy Converter (OWC-WEC) is one of the most efficient wave absorber equipment. This device transforms the vertical motion of water column in the air chamber into the air flow velocity and produces electricity from the driving force of turbine as represented by the Wells turbine. Therefore, in order to obtain high electric energy, it is necessary to amplify the water surface vibration by inducing resonance of the piston mode in the water surface fluctuation in the air chamber. In this study, a new type of OWC-WEC with a seawater channel is used, and the wave deformation by the structure, water surface fluctuation in the air chamber, air outflow velocity from the nozzle and seawater flow velocity in the seawater channel are evaluated by numerical analysis in detail. The numerical analysis model uses open CFD code OLAFLOW model based on multi-phase analysis technique of Navier-Stokes solver. To validate model, numerical results and existing experimental results are compared and discussed. It is revealed within the scope of this study that the air flow velocity at nozzle increases as the Ursell number becomes larger, and the air velocity that flows out from the inside of the air chamber is larger than the velocity of incoming air into the air chamber.
Keywords
OWC-WEC; OLAFLOW; channel of seawater exchange; air flow; seawater flow; water level fluctuation; Ursell number;
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Times Cited By KSCI : 1  (Citation Analysis)
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1 Ryu, H.J., Shin, S.H., Hong, K.Y., Hong, S.W. and Kim, D.Y. (2007). A Simulation of directional irregular waves at Chagui-Do sea area in Jeju using the Boussinesq wave model. Journal of Ocean Engineering and Technology, 21(1), 7-17 (in Korean).
2 Smagorinsky, J. (1963). General circulation experiment with the primitive equations. Mon, Weath. Rev., 91(3), 99-164.   DOI
3 Yin, Z., Shi, H. and Cao, X. (2010). Numerical simulation of water and air flow in oscillating water column air chamber. Proceedings of 20th International Offshore and Polar Engineering Conference, ISOPE, 796-801.
4 Boccotti, P. (2007a). Comparison between a U-OWC and a conventional OWC. Ocean Engineering, 34, 799-805.   DOI
5 Boccotti, P. (2007b). Caisson breakwaters embodying an OWC with a small opening-Part I: Theory. Ocean Engineering, 34, 806-819.   DOI
6 Bonke, K. and Ambli, N. (1986). Prototype wave power stations in Norway. Proceedings of International Symposium on Utilization of Ocean Waves-Wave to Energy Conversion. ASCE, 34-45.
7 CDIT (2001). Research and development of numerical wave channel (CADMAS-SURF), CDIT library, 12, Japan.
8 Cho, I.H. (2002). Wave energy absorption by a circular cylinder oscillating water column device. Journal of Ocean Engineering and Technology, 14(1), 8-18 (in Korean).
9 EI Marjani, A., Castro Ruiz, F., Rodriguez, M.A. and Parra Santos, M.T. (2008). Numerical modelling in wave energy conversion systems. Energy, 33, 1246-1253.   DOI
10 Evans, D.V. and Porter, R. (1995). Hydrodynamic characteristics of an oscillating water column device. Applied Ocean Research, 17, 155-164.   DOI
11 Falcao, A.F. de O. (2010). Wave energy utilization : A review of the technologies. Renewable and Sustainable Energy Reviews, 14, 899-918.   DOI
12 Evans, D.V. and Porter, R. (1997). Efficient calculation of hydrodynamic properties of OWC-type devices. Journal of Offshore Mechanics and Arctic Engineering, 119, 210-218.   DOI
13 Falcao, A.F. de O. (2000). The shoreline OWC wave power plant at the Azores. Proceedings of 4th European Wave Energy Conference, 42-47.
14 Falcao, A.F. de O. (2002). Control of an oscillating-water-column wave power plant for maximum energy production. Applied Ocean Research, 24, 73-82.   DOI
15 Falcao, A.F. de O. and Justino, P.A.P. (1999). OWC wave energy devices with air flow control. Ocean Engineering, 26, 1275-1295.   DOI
16 Falcao, A.F. de O. and Rodrigues, R.J.A. (2002). Stochastic modelling of OWC wave power plant performance. Applied Ocean Research, 24, 59-71.   DOI
17 Delaure, Y.M.C. and Lewis, A. (2003). 3D hydrodynamic modelling of fixed oscillating water column wave power plant by a boundary element methods. Ocean Engineering, 30, 309-330.   DOI
18 Gervelas, R., Trarieux, F. and Patel, M. (2011). A time-domain simulator for an oscillating water column in irregular waves at model scale. Ocean Engineering, 38, 1-7.   DOI
19 Goda, Y. and Suzuki, Y. (1976). Estimation of incident and reflected waves in random wave experiments. ICCE-1976, ASCE, 828-845.
20 Gouaud, F., Rey, V., Piazzola, J. and Van Hooff, R. (2010). Experimental study of the hydrodynamic performance of an onshore wave power device in the presence of an underwater mound. Coastal Engineering. 57, 996-1005.   DOI
21 Iturrioz, A., Guanche, R., Lara, J.L., Vidal, C. and Losada, I.J. (2015). Validation of OpenFOAM(R) for oscillating water column three-dimensional modeling, Ocean Engineering, 107, 222-236.   DOI
22 Greenhow, M. and White, S.P. (1997). Optimal heave motion of some axisymmetric wave energy devices in sinusoidal waves. Applied Ocean Research, 19, 141-159.   DOI
23 Heath, T., Whittaker, T.J.T. and Boake, C.B. (2000). The design, construction and operation of the LIMPET wave energy converter (Islay, Scotland). Proceedings of 4th European Wave Energy Conference, 49-55.
24 Higuera, P., Liu, P.L.F., Lin, C., Wong, W.Y. and Kao, M.J. (2018). Laboratory-scale swash flows generated by a non-breaking solitary wave on a steep slope. Journal of Fluid Mechanics, 847, 186-227.   DOI
25 Josset, C. and Clement, A.H. (2007). A time-domain numerical simulator for oscillating water column wave power plants. Renewable Energy, 32, 1379-1402.   DOI
26 Kissling, K., Springer, J., Jasak, H., Schutz, S., Urban, K. and Piesche, M. (2010). A coupled pressure based solution algorithm based on the volume-of-fluid approach for two or more immiscible fluids. European Conference on Computational Fluid Dynamics.
27 Kyoung, J.H., Hong, S.Y. and Hong, D.C. (2006). Numerical analysis on wave energy absorption of OWC-type wave power generation. Journal of Ocean Engineering and Technology, 20(4), 64-69 (in Korean).
28 Lee, K.H., Park, J.H., Baek, D.J., Cho, S and Kim, D.S. (2011). Discussion on optimal shape for wave power converter using oscillating water column. Journal of Korean Society of Coastal and Ocean Engineers, 23(5), 345-357 (in Korean).   DOI
29 Lee, K.H., Park, J.H., Cho, S. and Kim, D.S. (2013a). Numerical simulation of irregular airflow in OWC wave generation system considering sea water exchange. Journal of Korean Society of Coastal and Ocean Engineers, 25(3), 128-137 (in Korean).   DOI
30 Lee, K.H., Park, J.H. and Kim, D.S. (2012). Numerical simulation of irregular airflow within wave power converter using OWC by action of 3-dimensional irregular waves. Journal of Korean Society of Coastal and Ocean Engineers, 24(3), 189-202 (in Korean).   DOI
31 Lee, K.H., Park, J.H., Baek, D.J., Cho, S. and Kim, D.S. (2013b). Discussion on optimal shape for wave power converter using oscillating water column. Journal of Korean Society of Coastal and Ocean Engineers, 23(5), 345-357 (in Korean).   DOI
32 Malmo, O. and Reitan, A. (1985). Wave-power absorption by an oscillating water column in a channel. Journal of Fluid Mechanics, 158, 153-175.   DOI
33 Nakamura, T. and Nakahashi, K. (2005). Effectiveness of a chamber-tpye water exchange breakwater and its ability of wave power extractions by wave induced vortex flows. Proceedings of Civil Engineering in the Ocean, JSCE, 21, 547-552 (in Japanese).   DOI
34 Ohneda, H., Igarashi, S., Shinbo, O., Sekihara, S., Suzuki, K. and Kubota, H. (1991). Construction procedure of a wave power extracting caisson breakwater. Proceedings of 3rd Symposium on Ocean Energy Utilization, 171-179.
35 Paixao Conde, J.M. and Gato, L.M.C. (2008). Numerical study of the air-flow in an oscillating water column wave energy converter. Renewable Energy, 33, 2637-2644.   DOI
36 Park, J.H. (2013). The study on the fixed OWC wave power converter system. Master's Thesis, Korea Maritime and Ocean University (in Korean).
37 Ravindran, M. and Koola, P.M. (1991). Energy from sea waves-the Indian wave energy program. Current Science, 60, 676-680.