Diffraction of linear, monochromatic surface gravity waves by circular cylinders is reviewed by constructing an axisymmetric Green's function by an eigenfunction expansion. This study indicates that the Green's function method is capable of solving a complex problem, such as nonlinear diffraction theory. Nonlinear diffraction theory or second-order velocity potential can then be used to solve the practical problems faced by designers when utilizing large diameter cylindrical shapes for offshore structures in large amplitude storm waves.
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