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A 3D parallel boundary element method on unstructured triangular grids for fully nonlinear wave-body interactions

Abstract : This paper presents the development and validation of a three-dimensional numerical wave tank devoted to studying wave-structure interaction problems. It is based on the fully nonlinear potential flow theory, here solved by a boundary element approach and using unstructured triangular meshes of the domain's boundaries. Time updating is based on a second-order explicit Taylor series expansion. The method is parallelized using the Message Passing Interface (MPI) in order to take advantage of multi-processor systems. For radiation problems, with cylindrical bodies moving in prescribed motion, the free-surface is updated with a fully Lagrangian scheme, and is able to reproduce reference results for nonlinear forces exerted on the moving body. For diffraction problems, semi-Lagrangian time-updating is used, and reproduces nonlinear effects for diffraction on monopiles. Finally, we study the nonlinear wave loads on a fixed semi-submersible structure, thereby illustrating the possibility to apply the proposed numerical model for the design of offshore structures and floaters.
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https://hal.archives-ouvertes.fr/hal-02121232
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E. Dombre, J.C. Harris, Michel Benoit, D. Violeau, C. Peyrard. A 3D parallel boundary element method on unstructured triangular grids for fully nonlinear wave-body interactions. Ocean Engineering, Elsevier, 2019, 171, pp.505-518. ⟨10.1016/j.oceaneng.2018.09.044⟩. ⟨hal-02121232⟩

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