Numerical Investigation of Multi-body Wave Energy Converters’ Configuration
0
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
We investigate the performance of multi-body wave energy converters (WECs). This investigation considers multiple scattering of water waves by the buoys of a WEC under the generalized mode approach. Predominantly, the effect of a WEC’s configuration on its energy extraction is studied in this research. First, single-row terminator and single-column attenuator arrays of vertical cylinders have been studied. The performance of these attenuator arrays shows that the wall effect induced by the periodic buoys influences the wave propagation and energy extraction in these WECs. Further studies show that a single-row terminator array of vertical cylinders performs better than the corresponding single-column attenuator array. Subsequently, multi-row terminator arrays of vertical cylinders are investigated by conducting a parametric study. This parametric study shows that the hydrodynamic property of three resonance phenomena makes energy extraction efficiency drop down, and the magnitude of energy extracted oscillates between the resonance points in these WECs. Finally, a 4×8 terminator array of vertical cylinders is studied to determine the effect of various dx (x-directional distance between adjacent rows) within this WEC on its performance. In particular, this study enforces at least two equal dx values within the 4×8 terminator array of vertical cylinders. It shows that a small value of this dx leads to better energy extraction efficiency in some of these various dx arrays than that of a corresponding regular array with the same dx.
Abstract
We investigate the performance of multi-body wave energy converters (WECs). This investigation considers multiple scattering of water waves by the buoys of a WEC under the generalized mode approach. Predominantly, the effect of a WEC’s configuration on its energy extraction is studied in this research. First, single-row terminator and single-column attenuator arrays of vertical cylinders have been studied. The performance of these attenuator arrays shows that the wall effect induced by the periodic buoys influences the wave propagation and energy extraction in these WECs. Further studies show that a single-row terminator array of vertical cylinders performs better than the corresponding single-column attenuator array. Subsequently, multi-row terminator arrays of vertical cylinders are investigated by conducting a parametric study. This parametric study shows that the hydrodynamic property of three resonance phenomena makes energy extraction efficiency drop down, and the magnitude of energy extracted oscillates between the resonance points in these WECs. Finally, a 4×8 terminator array of vertical cylinders is studied to determine the effect of various dx (x-directional distance between adjacent rows) within this WEC on its performance. In particular, this study enforces at least two equal dx values within the 4×8 terminator array of vertical cylinders. It shows that a small value of this dx leads to better energy extraction efficiency in some of these various dx arrays than that of a corresponding regular array with the same dx.
참고문헌 (17)
- Mei, C. C, "Theory and Applications of Ocean Surface Waves: Part 1: Linear Aspects" (2005), World Scientific
- Garnaud, X, "Wave-Power Extraction by a Compact Array of Buoys", Journal of Fluid Mechanics, 635, pp.389~413 (2009)[DOI]
- Falnes, J, "Wave-Power Absorption by Parallel Rows of Interacting Oscillating Bodies", Applied Ocean Research, 4(4), pp.194~207 (1982)[DOI]
- Newman, J.N, "Wave Effects on Deformable Bodies", Applied Ocean Research, 16(1), pp.47~59 (1994)[DOI]
- Simon, M.J, "Multiple Scattering in Arrays of Axisymmetric Wave-Energy Devices. Part 1. A Matrix Method Using a PlaneWave Approximation", Journal of Fluid Mechanics, 120, pp.1~25 (1982)[DOI]
- McIver, P, "Approximation of Wave Forces on Cylinder Arrays", Applied Ocean Research, 6(2), pp.101~107 (1984)[DOI]
- Kagemoto, H, "Interactions Among Multiple Three-Dimensional Bodies in Water Waves : An Exact Algebraic Method", Journal of Fluid Mechanics, 166, pp.189~209 (1986)[DOI]
- Linton, C. M, "The Interaction of Waves with Arrays of Vertical Circular Cylinders", Journal of Fluid Mechanics, 215, pp.549~569 (1990)[DOI]
- Kashiwagi, M, "Hydrodynamic Interactions Among a Great Number of Columns Supporting a Very Large Flexible Structure", Journal of Fluids and Structures, 14(7), pp.1013~1034 (2000)[DOI]
- Tokić, G, "Hydrodynamics of Periodic Wave Energy Converter Arrays", Journal of Fluid Mechanics, 862, pp.34~74 (2019)[DOI]
- Tokić, G, "Optimal Configuration of Large Arrays of Floating Bodies for Ocean Wave Energy Extraction", Ph.D, pp.2016
- Tokić, G, "Hydrodynamics of Large Wave Energy Converter Arrays with Random Configuration Variations", Journal of Fluid Mechanics, 923, pp.R1~ (2021)[DOI]
- 최윤락, "밀집 배열 부이시스템의 파랑에너지 추출 효율 추정", 한국해양공학회지, 25(1), pp.8~13 (2011), 한국해양공학회
- 김정록, "내부유체 공진을 이용한 ‘Y’자 수로형 공명구조물내 파도응답 특성", 한국해안·해양공학회논문집, 31(3), pp.170~179 (2019), 한국해안,해양공학회[DOI]
- Liu, Y, "On Generalized Bragg Scattering of Surface Waves by Bottom Ripples", Journal of Fluid Mechanics, 356, pp.297~326 (1998)[DOI]
- Alam, M. R, "Bragg Resonance of Waves in a Two-Layer Fluid Propagating over Bottom Ripples. Part I. Perturbation Analysis", Journal of Fluid Mechanics, 624, pp.191~224 (2009)[DOI]
- Srokosz, M.A, "Some Relations for Bodies in a Canal, with an Application to Wave-Power Absorption", Journal of Fluid Mechanics, 99(1), pp.145~162 (1980)[DOI]