Proceedings of OMAE '02 The 21st International Conference on OFFSHORE MECHANICS AND ARCTIC ENGINEERING OMAE2002-28533 A PERFECTLY TRANSPARENT SPECTRAL SHELL FOR UNSTEADY WAVE-BODY INTERACTIONS *

• Main Authors: J Andrew Hamilton, Ronald W Yeung
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Arctic
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1080.637; http://proceedings.asmedigitalcollection.asme.org/data/Conferences/OMAE2002/69673/803_1.pdf

ABSTRACT A general outer boundary condition for time-dependent wave-body interaction problems is developed. The technique is based on domain decomposition and the unsteady free-surface Green function solution of the flow in an outer region. The boundary condition results in a shell condition which may be applied to a variety of interior solution methods. When the interior solution method is a boundary-integral method, an implicit matching can be done. When a volume-discretization method is used in the interior region, a newly developed explicit matching procedure is performed. Demonstrations of the transparent properties of this shell are made for several unsteady problems. INTRODUCTION In marine-related engineering problems, it is often necessary to predict wave-body interactions. Classical investigations of these problems rely on the assumption of an inviscid fluid, full linearization of the boundary conditions and reliance on linear system analysis in the frequency domain. However, full linearization often neglects important effects and inclusion of some or all nonlinear aspects of the problems has become desirable. Unfortunately, the nonlinear aspects of the problems complicate frequency domain analysis and disqualify the powerful linear system tools. Therefore, simulation in the time domain has become popular. Boundary-integral equation methods have proven very suc-