2021 Fiscal Year Annual Research Report
Development of a next-generation IGA-BEM based on T-splines to investigate the performance of complex-shaped wave energy devices undergoing strong mutual interactions in large arrays
| Project/Area Number |
18K13939
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| Research Institution | Kyushu University |
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Principal Investigator |
劉 盈溢 九州大学, 応用力学研究所, 助教 (30799127)
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| Project Period (FY) |
2018-04-01 – 2022-03-31
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| Keywords | wave energy array / point absorber device |
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| Outline of Annual Research Achievements |
The interaction theory presented by Kagemoto & Yue (1986) and refined by many other subsequent scholars is effective in wave effects on multiple surface-piercing bodies. By virtue of a boundary element method using the hybrid dipole-source formulation (Liu et al. 2021), interactions among point absorber arrays are considered. Based on the fundamental theoretical result that the maximum mean power generated by an axisymmetric heaving converter is equivalent to that contained in λ/2π length of an incident wave crest (Evans 1979; Falnes 1980), the array performance can be numerically predicted. The characteristics of the interactions amongst devices in association with three different layouts, i.e., uniform line array, double parallel array, and double staggered array, are analysed. Results show that in a uniform line array, trapped waves exist at critical wavenumbers just below the cut-off value kd=nπ/2 for incident head waves, similar to the circular cylinders in Maniar & Newman (1997). In a double array, significant load enhancement is found for the longitudinal and vertical forces, especially in beam waves. By arranging the array layout in a more randomised way, the optimal conditions for maximised power output of the array can be hard to reach. However, the maximum power output does increase to a higher level.
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Research Products
(7 results)
