Scalability of FETI-2LM methods on HPC clusters for Antenna RCS applications

International audienceThis paper presents the scalability of finite element tearing and interconnecting (FETI-2LM) methods for solving challenging electromagnetic frequency domain problems encountered in the design of low RCS antenna arrays. The scalability of the FETI-2LM method working on Nehalem X5560 cluster will be presented for antenna mock-up

Utilisation du détecteur courbe CPS 120 INEL en position horizontale ou verticale. Application à l'étude des composés d'insertion graphite-lithium

En utilisant les propriétés texturales des matériaux lamellaires ou fibrillaires hautement orientés, nous pouvons étudier "in-situ" la structure de composés, au cours de leur insertion, selon la méthode du "cristal tournant". Pour cela, nous avons réalisé un diffractomètre muni d'un détecteur courbe (CPS 120 INEL), que l'on peut placer horizontalement ou verticalement de manière à envelopper la sphère d'Ewald pour l'enregistrement des rangées (hkl)* que l'on souhaite étudier. L'échantillon est fixe ; le montage, par transmission. Ce dispositif nous a permis de mettre en évidence la modification de l'empilement des feuillets de graphène dans les composés d'insertion graphite-lithium de deuxième stade et de compléter la caractérisation structurale de ces composés.The textural properties of lamellar or fibrillar highly onented materials permit studying "in-situ" the structure changes which accompany intercalation into them, using the "rotating-crystal" method. To do so, we have used a diffractometer equipped with an INEL CPS 120 detector which can be placed in either a horizontal or vertical position, so as to completely encompass the Ewald sphere and allow recording the (hkl)* rods at any given point of reciprocal space. The sample is fixed in position and we used a transmission setup. We show the expenmental diagrams corresponding to the graphene stacking changes in second stage graphite-lithium intercalation compounds which have allowed completing the structural characterization of these phases

Interstitial laser thermotherapy in neurosurgery : A review

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Parallel implementation of a domain decomposition method for non-linear elasticity problems

Communication to : Workshop on domain-based parallelism and problem decomposition methods in computational science and engineering, Minneapolis, MN (USA), April 24-25, 1994SIGLEAvailable at INIST (FR), Document Supply Service, under shelf-number : 22419, issue : a.1994 n122 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc

High-order computation of burning propellant surface and simulation of fluid flow in solid rocket chamber

International audienceIn this paper, we present a numerical approach for predicting fluid flows in solid rocket motor (SRM) chambers. We use a novel high-order technique to track the burning grain surface. Spectral convergence toward the exact burning surface is achieved thanks to Fourier differentiation. In addition, we make use of a body-fitted mesh deforming with the burning surface and present a method to avoid manual remeshing. We describe several methods to deform the volume mesh and to keep good mesh element quality during the computation. We then couple the surface and volume approaches. The resulting coupled method is able to handle the formation of geometric singularities on the burning surface while keeping constant surface and volume mesh topology. This geometrical approach is integrated into a complex code for compressible, multi-species, turbulent flow simulations. Applications to the simulation of the internal flow in realistic solid rocket motors with complex grain geometry are then presented

Use of domain decomposition methods for non-linear structural computations

Communication to : IASS-IACM 2000 - 4th colloquium on computation of shell and spatial structures, Chania, Crete (Greece), June 05-07,2000SIGLEAvailable from INIST (FR), Document Supply Service, under shelf-number : 22419, issue : a.2000 n.111 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc

Domain decomposition eigenvalue solver for finite element mode computation in air-inlet

Communication to : IEEE AP-S International Symposium, Newport Beach, CA (USA), June 18-23, 1995SIGLEAvailable at INIST (FR), Document Supply Service, under shelf-number : 22419, issue : a.1995 n.55 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc