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http://dx.doi.org/10.9765/KSCOE.2018.30.6.253

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 Irregular Waves)  

Lee, Kwang Ho (Dept. of Energy 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. 253-262 More about this Journal
Abstract
Oscillating Water Column (OWC) Wave Energy Converters (WEC) harness electricity through a Power-Take-Off (PTO) system from the induced-airflow by seawater oscillating inside a chamber. In general, an air chamber with a relatively small cross-sectional area is required compared to seawater chamber to obtain high-velocity air in the PTO system, and in order to simulate an accurate air flow rate in the air chamber, a three-dimensional study is required. In this study, the dynamic response of OWC-WEC that is equipped with the channel of seawater exchange for the case of irregular waves has been numerically studied. The open source CFD software, OLAFLOW for the simulation of wave dynamics to the openFOAM and FOAM-extend communities, was used to simulate the interaction between the device and irregular waves. Based on the numerical simulation results, we discussed the fluctuation characteristics of three dimensional air flow in the air-chamber, wave deformation around the structure and the seawater flow inside the channel of seawater exchange. The numerical results the maximum air flow velocity in the air-chamber increases as the Ursell value of the significant wave increases, and the velocity of airflow flowing out from the inside of air chamber to the outside is greater than the speed of flowing into the air chamber from the outside.
Keywords
OWC-WEC; OLAFLOW; 3-Dimensional irregular waves; air flow; seawater flow; water level; Ursell number;
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Times Cited By KSCI : 1  (Citation Analysis)
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1 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
2 Lee, K.H., Lee, J.H., Jeong, I.H. and Kim, D.S. (2018). 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). Journal of Korean Society of Coastal and Ocean Engineers, 30(6), 242-252 (in Korean).   DOI
3 Smagorinsky, J. (1963). General circulation experiment with the primitive equations. Mon, Weath. Rev., 91(3), 99-164.   DOI
4 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.
5 Boccotti, P. (2007a). Comparison between a U-OWC and a conventional OWC. Ocean Engineering, 34, 799-805.   DOI
6 Boccotti, P. (2007b). Caisson breakwaters embodying an OWC with a small opening-Part I : Theory. Ocean Engineering, 34, 806-819.   DOI
7 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
8 Falcão, 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
9 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
10 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
11 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
12 Goda, Y. (1988). Statistical variability of sea state parameters as a function of wave spectrum. Coastal Engineering in Japan, JSCE, 31(1), 39-52.   DOI
13 Goda, Y. (2000). Random seas and design of maritime structures. World Scientific Publishing, Singapore.
14 Goda, Y. and Suzuki, Y. (1976). Estimation of incident and reflected waves in random wave experiments. ICCE-1976, ASCE, 828-845.
15 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
16 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
17 Koo, W. and Kim, M.H. (2012). A time-domain simulation of an oscillating water column with irregular waves. Ocean Systems Engineering, 2(2), 147-158.   DOI
18 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
19 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, ECCOMAS CFD.