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Indexed by:期刊论文

Date of Publication:2008-06-01

Journal:OCEAN ENGINEERING

Included Journals:SCIE、EI

Volume:35

Issue:8-9

Page Number:887-899

ISSN No.:0029-8018

Key Words:numerical wave tank; infinite water-depth; HOBEM; focused wave groups; fully non-linear

Abstract:Inviscid three-dimensional free surface wave motions are simulated using a novel quadratic higher order boundary element model (HOBEM) based on potential theory for irrotational, incompressible fluid flow in an infinite water-depth. The free surface boundary conditions are fully non-linear. Based on the use of images, a channel Green function is developed and applied to the present model so that two lateral surfaces of an infinite-depth wave tank can be excluded from the calculation domain. In order to generate incident waves and dissipate outgoing waves, a non-reflective wave generator, composed of a series of vertically aligned point sources in the computational domain, is used in conjunction with upstream and downstream damping layers. Numerical experiments are carried out, with linear and fully non-linear, regular and focused waves. It can be seen from the results that the present approach is effective in generating a specified wave profile in an infinite water-depth without reflection at the open boundaries, and fully non-linear numerical simulations compare well with theoretical solutions. The present numerical technique is aimed at efficient modelling of the non-linear wave interactions with ocean structures in deep water. (C) 2008 Elsevier Ltd. All rights reserved.