Three-dimensional multiple scattering of elastic waves by spherical inclusions

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Show simple item record Liu, Zunping 2007-08-10T19:51:02Z 2007-08-10T19:51:02Z 2007-08-10T19:51:02Z
dc.description.abstract A computational system is built for conducting deterministic simulations of three-dimensional multiple scattering of elastic waves by spherical inclusions. Based on expansion expression of elastic wave fields in terms of scalar and vector spherical harmonics, analytically exact solutions of single scattering and multiple scattering are obtained, implemented and verified. The verification is done by using continuities of displacement and surface traction at the interface between an inclusion and host medium, energy conservation and published results. The scatterer polymerization methodology is extended to three-dimensional multiple scattering solution. By using this methodology, an assemblage of actual scatterers can be treated as an abstract scatterer. This methodology is verified by using different approaches, with or without scatterer polymerization, to solve a physically the same multiple scattering problem. As an application example, band gap formation process for elastic wave propagation in cubic lattice arrangements of spherical scatterers is observed through a series of numerical simulations. Along the direction of the incident wave, scatterer arrangements are viewed as comprising layers of scatterers, within which scatterers form a square grid. Starting from one layer and by increasing the number of layers, near-field forward wave propagation spectra are computed as the number of layers increases. These simulations also demonstrates that the computational system has the capability to simulate multiple scattering solutions of elastic waves in three-dimension. en
dc.description.sponsorship Aircraft Design and Manufacturing Research Center (ADMRC); National Science Foundation (NSF). en
dc.language.iso en_US en
dc.publisher Kansas State University en
dc.subject multiple scattering en
dc.subject elastic waves en
dc.subject spherical inclusion en
dc.subject band gap formation en
dc.title Three-dimensional multiple scattering of elastic waves by spherical inclusions en
dc.type Dissertation en Doctor of Philosophy en
dc.description.level Doctoral en
dc.description.department Department of Mechanical and Nuclear Engineering en
dc.description.advisor Liang-Wu Cai en
dc.subject.umi Applied Mechanics (0346) en
dc.subject.umi Engineering, Mechanical (0548) en
dc.subject.umi Physics, Acoustics (0986) en 2007 en August en

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