Cohen G. Higher-Order Numerical Methods for Transient Wave Equations 2002

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Cohen G. Higher-Order Numerical Methods for Transient Wave Equations 2002

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Textbook in PDF format Solving efficiently the wave equations involved in modeling acoustic, elastic or electromagnetic wave propagation remains a challenge both for research and industry. To attack the problems coming from the propagative character of the solution, the author constructs higher-order numerical methods to reduce the size of the meshes, and consequently the time and space stepping, dramatically improving storage and computing times. This book surveys higher-order finite difference methods and develops various mass-lumped finite (also called spectral) element methods for the transient wave equations, and presents the most efficient methods, respecting both accuracy and stability for each sort of problem. A central role is played by the notion of the dispersion relation for analyzing the methods. The last chapter is devoted to unbounded domains which are modeled using perfectly matched layer (PML) techniques. Numerical examples are given. Front Matter Front Matter The Basic Equations Functional Issues Plane Wave Solutions Front Matter Construction of the Schemes in Homogeneous Media The Dispersion Relation Stability of the Schemes Numerical Dispersion and Anisotropy Construction of the Schemes in Heterogeneous Media Stability by Energy Techniques Reflection-Transmission Analysis Front Matter Mass-Lumping in 1D Spectral Elements Mass-Lumped Mixed Formulations and Edge Elements Modeling Unbounded Domains Back Matter