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

机译：流体界面附近物体声散射的有限元模型

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摘要

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.
机译：我们提出了一个有限元模型，用于从位于分离两个流体域（每个半无限范围）的表面附近（或相交）的弹性物体的声散射。使用完美匹配层（PML）截断流体域，将其构造为数学模型的固有部分。这种方法在处理散射体的几何形状和流体界面时提供了很大的灵活性。 PML可实现的高精度水平是建立在均匀流体中散射的标准验证问题上的。该模型还适用于来自位于海床附近的物体的声散射问题，在海床中，海底被声学模拟为流体。数值结果表明，对于相同的问题，与已发布的T-矩阵解决方案非常吻合。

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