Finite-element modelling of acoustic wave scattering from fluid, rigid and elastic objects
Keywords:Acoustic wave propagation, Computation theory, Computer software, Elasticity, Finite element method, Natural frequencies, Rigidity, 3-D arbitrary-shaped structures, Acoustic scattering models, Elastic spheres, Finite-element modeling
AbstractA finite element model (FEM) of acoustic wave propagation through 3-D arbitrary-shaped structures is developed to solve the problem of high frequency acoustic scattering. The FEMLAB® software package was used to develop and solve acoustic scattering models from fluid, rigid, and elastic spheres immersed in a fluid medium, for which analytical solutions are available. The entire computation domain is modeled as a sphere filled with fluid domains. It is found that the FEM provided accurate predictions of wave scattering by three types of scatterers, fluid, rigid immovable, and elastic.
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