Soheil HAJIAN
(Université de Genève)
21/01/2015 18:00
présentation murale
Domain decomposition preconditioners and in particular the additive
Schwarz method are favorite preconditioners for classical finite
element methods (FEM). There is a huge effort in designing similar
preconditioners for discontinuous Galerkin (DG) discretizations. It
has been shown that additive Schwarz methods use different mechanisms
for convergence when applied to a DG discretization...
Marc Bakri
(ONERA)
21/01/2015 18:00
présentation murale
Nous présenterons plusieurs indicateurs d'erreur /a posteriori /adaptés aux méthodes d'éléments finis utilisées pour discrétiser les équations intégrales en acoustique 2D.
En particulier, nous introduirons une nouvelle classe d'estimateurs fiables et efficaces
dont la construction est basée sur une nouvelle technique de localisation des normes de Sobolev fractionnaires.
Faycal Chaouqui
(Université de Genève)
21/01/2015 18:00
présentation murale
Optimal Schwarz methods and Neuman-Neuman methods have
for two subdomains both the interesting property that they can lead to
nil-potent iteration matrices. We study in this poster if this property
can also be obtained for the case of a strip decomposition into many
subdomains. We show that only the optimal Schwarz method can
lead in this case to a nil-potent iteration matrix, and that...
Mme
imen hassairi
(Did not come to the conference)
21/01/2015 18:00
présentation murale
We are concerned with the problem of existence and uniqueness of a solution in class D for the backward stochastic differential equations (BSDEs for short) with two continuous reflecting barriers which are completely separated. We consider that the data are Lp-integrable with p = 1.
Hui Zhang
(Université de Genève)
21/01/2015 18:00
présentation murale
Many of the modern iterative algorithms for the Helmholtz (or a more general PDE) operator
have common ingredients. We show that all these algorithms can be understood in the
framework of optimized Schwarz methods. They only differ in the particular choice on how
to approximate the optimal transmission condition which contains a Dirichlet to Neumann operator,
in the choice of the subdomain...
Asma Toumi
(ONERA)
21/01/2015 18:00
présentation murale
La simulation numérique est de systèmes physiques multi-échelles est souvent synonyme de calculs coûteux et particulièrement longs.
En effet, dans les méthodes classiques d’intégration temporelle, le pas de temps local le plus faible est souvent limitant pour le pas de temps global d'intégration.
Notre étude porte sur un schéma asynchrone permettant de lever cette limitation.
Ce formalisme...
M.
Zakaria Belhaj
(Did not come to the conference)
21/01/2015 18:00
présentation murale
Troesch's problem arises in the investigation of the confinement of a plasma column by radiation pressure. Recently, this problem has been studied extensively.
We present a variational approximation method for solving Troesch's problem. The existence and the uniqueness of this problem are shown. Moreover, we construct a sequence of solutions of the problem from the number of knots in the...
Shu-Lin Wu
(Université de Genève)
21/01/2015 18:00
présentation murale
We try to analyze the convergence properties of the wave-ray multigrid method for the Helmholtz equation in
the 1D case. We present the details of the method and perform a local Fourier analysis for the convergence behavior.
This preliminary study shows no remarkable evidence of advantages by using the wave-ray idea.
