2020 Fiscal Year Research-status 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 | interaction theory / potential formulation |
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| Outline of Annual Research Achievements |
The interaction theory of Kagemoto & Yue (1986) signicantly reduces the computational burden in the wave interaction problem of multiple surface-piercing bodies, in which two essential operators are the so-called Diffraction Transfer Matrix and Radiation Characteristics. This theory was later implemented by Goo & Yoshida (1990) and Flavia et al. (2018), etc., using the source distribution method. However, the accuracy of the source distribution method is proved to be worse than the hybrid source & dipole distribution method (i.e., potential formulation). In the present work, a set of new equations have been derived based on the potential formulation and the interaction theory. Good agreement is found between the present results and those from literature. Moreover, two alternative approaches to solve the diffraction problem have been compared using two benchmark geometries to assess both their accuracy and efficiency. The two approaches are respectively using the Neumann-type and the Dirichlet-type boundary conditions for the incident wave potential. It is found that while the accuracy does not differ much, the computational cost can be reduced significantly using the latter approach instead of the other. In addition, it is also found that the accuracy of the Neumann-type approach heavily relies on the meshing density.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
New equations based on the potential formulation applying the interaction theory have been derived. The implementation and the subsequent numerical validations justify the effectiveness of the present method. The work has been summarized and submitted to Applied Ocean Research. It is also presented in the prestigious 36th IWWWFB workshop held in April, 2021.
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| Strategy for Future Research Activity |
The new approach will be applied to study the optimized layout of large wave farms.
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| Causes of Carryover |
Due to the pandemic of COVID-19, the planned attendances to international conferences were cancelled. The rest of funding will be used in the open-access publication fee of research papers and purchasing the software.
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Research Products
(2 results)
