Abstract
This paper presents an analytical model to solve the linear wave diffraction problem using a truncated cylinder with an arbitrary smooth cross section. Using the method of separation of variables, the boundary condition equations for the surface of a truncated cylinder are derived. Based on the condition that the radius function of a cylinder surface can be expanded into a Fourier series, the unknown coefficients of the diffraction potential can be obtained from a linear system equation. The surface elevation and wave force are calculated and analyzed in terms of the total velocity potential for different cases. The truncated error introduced in the solving process is discussed. Then, the accuracy of this method is verified by comparison with the results of the boundary element method. Finally, this method is further extended to a practical engineering application with a quasi-ellipse caisson for different drafts and exposures.
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