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Indexed by:期刊论文

Date of Publication:2012-02-01

Journal:OCEAN ENGINEERING

Included Journals:SCIE、EI、Scopus

Volume:40

Page Number:76-90

ISSN No.:0029-8018

Key Words:Scaled boundary finite element method; Short-crested wave; Wave diffraction; Porous media; Double-layered walls; Wave-structure interaction

Abstract:This paper aims at extending the semi-analytical scaled boundary finite element method (SBFEM) to deal with the short-crested waves interaction with a surface-piercing concentric cylindrical structure, which consists of a solid inner cylinder and a coaxial double-layered perforated wall. The whole fluid domain is divided into three sub-domains including two bounded and one unbounded domains, and a variational principle formulation is used to derive the SBFEM equation in each sub-domain. Hankel functions and Bessel functions are chosen as the basis function for the solution of the unbounded and bounded domains, respectively. Although the structure adds a porous cylinder compared to that of Tao's work (2009), the SBFEM also needs to discretize only the outermost porous cylinder with curved surface finite-elements and keeps the radial differential equation solved completely analytically. However, the unknown coefficient vectors for solving the SBFEM equations increase compared with that of Tao's work. Thus we re-derive the solving process for the SBFEM equations. The results of numerical verification show that the present method yields excellent results with only a few nodes and quick convergence. The major factors including wave parameters and structure configuration that affect the wave forces, surface elevations and the diffracted wave contours are examined. (C) 2011 Elsevier Ltd. All rights reserved.