Well-posedness of first-order acoustic wave equations and space-time finite element approximation

2023/11/17 by Thomas Führer, Roberto González, Führer, Thomas +3 · 5 citations
Mathematics · Engineering · Computer Science · #Numerical methods in inverse problems #Electromagnetic Simulation and Numerical Methods #Advanced Mathematical Modeling in Engineering

paper · pdf · doi:10.48550/arxiv.2311.10536

Abstract

We study a first-order system formulation of the (acoustic) wave equation and prove that the operator of this system is an isomorphsim from an appropriately defined graph space to L². The results rely on well-posedness and stability of the weak and ultraweak formulation of the second-order wave equation. As an application we define and analyze a space-time least-squares finite element method for solving the wave equation. Some numerical examples for one- and two- dimensional spatial domains are presented.

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