# hpfem/esco2012-boa

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 \title{High Order DGTD Method with Local Time Stepping for the Solution of the First Order Maxwell Equations} \tocauthor{S. Descombes} \author{} \institute{} \maketitle \begin{center} {\large St\'ephane Descombes}\\ UniversitÃ© Nice Sophia Antipolis and {\sc Nachos} project-team, INRIA Sophia Antipolis - M\'editerran\'ee research center\\ {\tt sdescomb@unice.fr} \\ \vspace{4mm}{\large St\'ephane Lanteri, Jospeh Charles}\\ {\sc Nachos} project-team, INRIA Sophia Antipolis - M\'editerran\'ee research center\\ {\tt Stephane.Lanteri@inria.fr, Joseph.Charles@inria.fr} \\ \vspace{4mm}{\large Julien Diaz}\\ {\sc Magique-3D} project-team, INRIA Bordeaux - Sud-Ouest research cente\\ {\tt Julien.Diaz@inria.fr} \end{center} \section*{Abstract} In this talk we are interested in the discretization in space and time of the Maxwell's equations in the presence of locally refined meshes. A discontinuous Galerkin methods is used and naturally allow high order spatial approximation of the field in each cell. The question is now the choice of the time discretization. Most explicit time stepping methods are conditionally stable and the finest element in a non-uniform mesh dictates the maximum time step allowed to all the other elements of the computational domain. Various local explicit time stepping strategies have been then proposed, presenting the advantage to use non-uniform time step sizes on non-uniform meshes to further improve the efficiency of the numerical scheme by setting time steps accordingly to their corresponding element size. In this talk, we propose fully explicit high order local time stepping strategies in the spirit of those recently proposed in [1]. This is done here in the framework of a non-dissipative discontinuous Galerkin time domain (DGTD) method for the solution of the first order form of the system of Maxwell's equations. \bibliographystyle{plain} \begin{thebibliography}{10} \bibitem{1zz} {\sc J. Diaz and M.J. Grote}. {Energy conserving explicit local time-stepping for second-order wave equations}. SIAM J. Sci. Comput. 31 (2009) 1985--2014. \end{thebibliography}
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