| 研究実績の概要 |
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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