Wave propagation

Friday, June 30, 2017 - 11:20am - 12:10pm
Francisco-Javier Sayas (University of Delaware)
I will explain ongoing work with my team (Tom Brown, Shukai Du, and Hasan Eruslu) on Finite Element simulation of elastic wave propagation in media that are modeled using a strain-to-stress relation that keeps track of the past evolution of the solid. The family of models I will discuss includes the classical (Zener) differential viscoelastic model, a fractional derivative version thereof, and combinations of the above with pure elastic behavior.
Thursday, December 2, 2010 - 9:00am - 9:45am
Mark Ainsworth (University of Strathclyde)
In an influential article, Marfurt suggested that the best scheme for computational wave propagation would involve an averaging of the consistent and lumped finite element approximations. Many authors have considered how this might be accomplished for first order approximation, but the case of higher orders remained unsolved.
Wednesday, December 1, 2010 - 9:00am - 9:45am
Ulrich Rüde (Friedrich-Alexander-Universität Erlangen-Nürnberg)
We will report on our experiences implementing PDE solvers on Peta-Scale computers, such as the 290 000 core IBM Blue Gene system in the Jülich Supercomputing Center. The talk will have two parts, the first one reporting on our Hierarchical Hybrid Grid method, a prototype Finite Element Multigrid Solver scaling up to a trillion (10^12) degrees of freedom on a tetrahedral mesh by using a carefully designed matrix-free implementation.
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