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217 personnes travaillent au LJLL

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Chiffres janvier 2014

 

2016-GdT ITER - L.M. Imbert-Gérard

Jeudi 13 octobre 2016 à 11h en couloir 15-16 salle 309: Lise-Marie Imbert-Gérard (Courant Institute, NYU)

«Variable coefficients and numerical methods for electrmagnetic waves»

Abstract:
In the first part of the talk, we will discuss a numerical method for wave propagation in inhomogeneous media. The Trefftz method relies on basis functions that are solution of the homogeneous equation. In the case of variable coefficients, basis functions are designed to solve an approximation of the homogeneous equation. The design process yields high order interpolation properties for solutions of the homogeneous equation. This introduces a consistency error, requiring a specific analysis. In the second part of the talk, we will discuss a numerical method for elliptic partial differential equations on manifolds. In this framework the geometry of the manifold introduces variable coefficients. Fast, high order, pseudo-spectral algorithms were developed for inverting the Laplace-Beltrami operator and computating the Hodge decomposition of a tangential vector field on closed surfaces of genus one in a three dimensional space. Robust, well-conditioned solvers for the Maxwell equations will rely on these algorithms.