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A numerical model for non‐linear wave diffraction around large offshore structures
Author(s) -
Li Baoyuan,
Lu Yulin
Publication year - 1987
Publication title -
international journal for numerical methods in fluids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 112
eISSN - 1097-0363
pISSN - 0271-2091
DOI - 10.1002/fld.1650071205
Subject(s) - diffraction , boundary value problem , boundary (topology) , free surface , mechanics , cylinder , submarine pipeline , amplitude , scattering , surface wave , geology , physics , geometry , classical mechanics , mathematical analysis , mathematics , optics , geotechnical engineering
The present paper describes a numerical model for predicting the non‐linear wave forces exerted on large coastal or offshore structures. The interaction is calculated from a known initial condition corresponding to still water in the immediate vicinity of the structure. A prescribed incident wave of large amplitude approaches the structure. The boundary constraints on the free surface are considered in the fully non‐linear versions. Not far away from the structure, an artificial open boundary is considered with a suitable description of the radiation boundary condition for an incident wave propagating inwards, and in addition the scattering wave being absorbed. The finite difference method and time stepping are adopted for numerical calculation in the present model. For illustration the wave forces on a surface‐piercing vertical cylinder subjected to two different incident wave trains were evaluated. Reasonably good agreement could be obtained between the numerical results and the analytical solution given by Isaacson. 1 .