Hits:

Indexed by:期刊论文

Date of Publication:2011-12-01

Journal:CHINA OCEAN ENGINEERING

Included Journals:Scopus、SCIE、EI、ISTIC

Volume:25

Issue:4

Page Number:687-697

ISSN No.:0890-5487

Key Words:Laplace equation; nonlinear wave; 0-1 combined type BEM; FEM; two order terms

Abstract:In this paper the 0-1 combined BEM is adopted to subdivide the computational domain boundary, and to discretize the Green's integral expression based on Laplace equation. The FEM is used to subdivide the wave surface and deduce the surface equation which satisfies the nonlinear boundary conditions on the surface. The equations with potential function and wave surface height as an unknown quantity by application of Taylor expansion approach can be solved by iteration within the time step. In m-time iteration within the computational process of time step (n-1)Delta t to n Delta t, the results of the previous iteration are taken as the initial value of the two-order unknown terms in the present iteration. Thus, an improved tracking mode of nonlinear wave surface is established, and numerical results of wave tank test indicate that this mode is improved obviously and is more precise than the previous numerical model which ignored the two-order unknown terms of wave surface location and velocity potential function in comparison with the theoretical values.