A finite element model for acoustic scattering from objects near a fluid–fluid interface

✍ Scribed by Joseph J. Shirron; Thomas E. Giddings

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 299 KB
• Volume: 196
• Category: Article
• ISSN: 0045-7825
• DOI: 10.1016/j.cma.2006.07.009

✦ Synopsis

We present a finite element model for acoustic scattering from an elastic object situated near (or intersecting) the surface separating two fluid domains, each of semi-infinite extent. The fluid domains are truncated using a perfectly matched layer (PML) formulated as an intrinsic part of the mathematical model. This approach provides a great deal of flexibility in dealing with the geometry of the scatterer and the fluid-fluid interface. The high level of accuracy achievable with the PML is established with standard validation problems for scattering in a homogeneous fluid. The model is also applied to the problem of acoustic scattering from objects situated near the ocean floor, where the ocean bottom is modeled acoustically as a fluid. Numerical results show very close agreement with a published T-matrix solution for the same problem.