Stéphane JAOUEN
Stéphane Jaouen is a Research Engineer and holds a PhD in Mathematics Applied to Scientific Computing. He is currently member of an R&D team at CEA whose objective is to develop new models and new numerical methods for HPC numerical simulation codes. After numerous studies on arbitrarily high order Eulerian schemes in the Lagrange-projection approach for fluid models in the broad sense, his main research themes now revolve around Eulerian models and schemes for processing and simulating interface dynamics, damage and fragmentation (surface tension, instability studies, slip/friction, coupling models, fluid/structure interaction, etc.). Stéphane Jaouen has (co-)supervised about fifteen students, four PhDs and a post-doctoral and is co-author of a dozen articles published in international scientific journals.
PhDs co-supervised
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G. DAKIN, Couplage fluide-structure avec des schémas Volumes Finis conservatifs Eulériens et Lagrangiens, Thèse de doctorat CEA/Univ. Pierre et Marie Curie, Paris 6, 2017.
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B. MELTZ, Analyse mathématique et numérique de systèmes d’hydrodynamique compressible et de pho- tonique en coordonnées polaires, Thèse de doctorat CEA/Univ. Paris-Saclay, Paris-Sud, 2015.
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M. WOLFF, Analyse mathématique et numérique du système de la magnétohydrodynamique résistive avec termes de champs magnétique auto-généré, Thèse de doctorat CEA/Univ. Louis Pasteur de Strasbourg, rapport CEA-R-6280, ISSN 0429-3460, 2011.
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C. ENAUX, Analyse mathématique et numérique d’un modèle multifluide multivitesse pour l’interpéné- tration de fluides miscibles, Thèse de doctorat École Centrale de Paris / CEA, 2007.
Postdoctorals co-supervised
- M. ANCELLIN, Algorithmes d’apprentissage et réseaux de neurones appliqués au calcul scientifique, LRC MESO, ENS Paris-Saclay/CEA, 2021.
Journal of Computational Physics, p. 111721, 2023
2023
Journal of Computational Physics, p. 339-364, 2019
Journal of Computational Physics, p. 228-257, 2018
JOURNAL OF APPLIED PHYSICS, AMER INST PHYSICS, 2017
abstract
Abstract
We compare, at similar scales, the processes of microjetting and ejecta production from shocked roughened metal surfaces by using atomistic and continuous approaches. The atomistic approach is based on very large scale molecular dynamics (MD) simulations with systems containing up to 700 x 10(6) atoms. The continuous approach is based on Eulerian hydrodynamics simulations with adaptive mesh refinement; the simulations take into account the effects of viscosity and surface tension, and the equation of state is calculated from the MD simulations. The microjetting is generated by shock-loading above its fusion point a three-dimensional tin crystal with an initial sinusoidal free surface perturbation, the crystal being set in contact with a vacuum. Several samples with homothetic wavelengths and amplitudes of defect are simulated in order to investigate the influence of viscosity and surface tension of the metal. The simulations show that the hydrodynamic code reproduces with very good agreement the profiles, calculated from the MD simulations, of the ejected mass and velocity along the jet. Both codes also exhibit a similar fragmentation phenomenology of the metallic liquid sheets ejected, although the fragmentation seed is different. We show in particular, that it depends on the mesh size in the continuous approach. Published by AIP Publishing.
Finite Volumes for Complex Applications VII-Elliptic, Parabolic and Hyperbolic Problems, Springer International Publishing, p. 901-909, 2014
Laser and Particle Beams, p. 415-419, 2012
Phys. Rev. E, p. 066307, 2012
Discrete and Continuous Dynamical Systems S, AIMS, p. 345-367, 2012
Esaim Proceedings, p. 195-210, 2011
Comptes Rendus Académie des Sciences, Paris, Série I, p. 105-110, 2010
Physics of Plasmas, p. 044502, 2009
Journal of Computational Physics, p. 833-860, 2009
Plasma Physics and Controlled Fusion, p. B601-B610, 2007
Shock compression of condensed matter, p. 47-50, 2007
Journal of Computational Physics, p. 464-490, 2007
Computer Methods in Applied Mechanics and Engineering, p. 3127-3140, 2007
APS shock compression of condensed matter meeting abstracts, p. G4.004, 2007
Physics of Plasmas, p. 122701, 2006
Numerical Methods for Hyperbolic and Kinetic Problems, IRMA lectures in Mathematics and Theoretical Physics, p. 177-207, 2005
Journal of Computational Physics, p. 80-105, 2004