In this paper, we introduce a high-order discontinuous Galerkin method, based on centered fluxes and a family of high-order leap-frog time schemes, for the solution of the 3D elastodynamic equations written in velocity-stress formulation. We prove that this explicit scheme is stable under a CFL type condition obtained from a discrete energy which is preserved in domains with free surface or decreasing in domains with absorbing boundary conditions. Moreover, we study the convergence of the method for both the semi-discrete and the fully discrete schemes, and we illustrate the convergence results by the propagation of an eigenmode. We also propose a series of absorbing conditions which allow improving the convergence of the global scheme. Finally, several numerical applications of wave propagation, using a 3D solver, help illustrating the various properties of the method.
DOI : 10.1051/m2an/2015001
Mots clés : Discontinuous Galerkin method, centered flux, leap-frog scheme, elastodynamic equation
@article{M2AN_2015__49_4_1085_0, author = {Delcourte, Sarah and Glinsky, Nathalie}, title = {Analysis of a high-order space and time discontinuous {Galerkin} method for elastodynamic equations. {Application} to {3D} wave propagation}, journal = {ESAIM: Mathematical Modelling and Numerical Analysis }, pages = {1085--1126}, publisher = {EDP-Sciences}, volume = {49}, number = {4}, year = {2015}, doi = {10.1051/m2an/2015001}, mrnumber = {3371905}, zbl = {1320.74101}, language = {en}, url = {http://www.numdam.org/articles/10.1051/m2an/2015001/} }
TY - JOUR AU - Delcourte, Sarah AU - Glinsky, Nathalie TI - Analysis of a high-order space and time discontinuous Galerkin method for elastodynamic equations. Application to 3D wave propagation JO - ESAIM: Mathematical Modelling and Numerical Analysis PY - 2015 SP - 1085 EP - 1126 VL - 49 IS - 4 PB - EDP-Sciences UR - http://www.numdam.org/articles/10.1051/m2an/2015001/ DO - 10.1051/m2an/2015001 LA - en ID - M2AN_2015__49_4_1085_0 ER -
%0 Journal Article %A Delcourte, Sarah %A Glinsky, Nathalie %T Analysis of a high-order space and time discontinuous Galerkin method for elastodynamic equations. Application to 3D wave propagation %J ESAIM: Mathematical Modelling and Numerical Analysis %D 2015 %P 1085-1126 %V 49 %N 4 %I EDP-Sciences %U http://www.numdam.org/articles/10.1051/m2an/2015001/ %R 10.1051/m2an/2015001 %G en %F M2AN_2015__49_4_1085_0
Delcourte, Sarah; Glinsky, Nathalie. Analysis of a high-order space and time discontinuous Galerkin method for elastodynamic equations. Application to 3D wave propagation. ESAIM: Mathematical Modelling and Numerical Analysis , Tome 49 (2015) no. 4, pp. 1085-1126. doi : 10.1051/m2an/2015001. http://www.numdam.org/articles/10.1051/m2an/2015001/
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