Frédéric LEGOLL

• Organization: ENPC
• Research Unit: Laboratoire Navier, équipe Multiéchelle
• Phone: 01 64 15 37 81
• E-mail: frederic.legoll at enpc.fr
• Bureau: V 014
• Courrier:
  Laboratoire Navier - ENPC
  6 et 8 avenue Blaise Pascal
  Cité Descartes - Champs sur Marne
  77455 Marne la Vallée Cedex 2 (FRANCE)

English version here

Recrutements / Hiring:

Centres d'intérêts principaux:

• Méthodes numériques en homogénéisation stochastique (réduction de variance, problèmes faiblement aléatoires), homogénéisation numérique (méthode MsFEM).
  
  
• Méthodes et algorithmes pour la dynamique moléculaire (dynamiques effectives, réduction de dimension, problèmes multi-échelles en temps, algorithmes pararéels, Hamiltoniens hautement oscillants, échantillonnage).
  
  
• Analyse numérique de modèles micro-macro pour les solides, couplant un modèle atomistique avec un modèle de mécanique du continuum (problèmes variationnels, coarse-graining, température finie).

Activité éditoriale:

• SIAM Multiscale Modeling and Simulation
  
  
• ESAIM Proceedings
  
  
• Journal of Machine Learning for Modeling and Computing

Quelques videos sur mes travaux de recherche:

• HIM workshop on "Multiscale problems: Algorithms, Numerical analysis and Computation", Bonn, August 20, 2024: Multiscale Finite Element Methods for advection-diffusion and reaction-diffusion problems.
  
  
• IPAM workshop on "Scale-Bridging Materials Modeling at Extreme Computational Scales", part of the Long Program on "New Mathematics for the Exascale: Applications to Materials Science", Los Angeles, April 21, 2023: Parareal algorithms for molecular dynamics simulations (also available on YouTube).
  
  
• Mittag-Leffler Institut workshop on "New trends in numerical multiscale methods and beyond", July 2021 (online conference): On the construction of coarse approximations for highly oscillatory elliptic problems by using coupling approaches
  
  
• WCCM conference, January 2021 (online conference): Multiscale Finite Element approaches: Error estimation and adaptivity for an enriched variant
  
  
• 26th International Domain Decomposition Conference, December 2020 (online conference): A MsFEM approach with high-order Legendre polynomials
  
  
• BIRS workshop on "Developments in the Theory of Homogenization", Banff, July 28, 2015: Special Quasirandom Structures: a selection approach for stochastic homogenization
  
  
• BIRS workshop on "Free-Energy Calculations: a Mathematical Perspective", Oaxaca, July 21, 2015: Reduced models for computing the dynamics of reaction coordinates
  
  
• CEMRACS 2013 au CIRM, "Modeliser et simuler la complexite: approches stochastiques et deterministes", August 7, 2013: Variance reduction approaches for stochastic homogenisation
  
  
• BIRS workshop on "Nonequilibrium Statistical Mechanics: Mathematical Understanding and Numerical Simulation", Banff, November 13, 2012: Derivation of Langevin dynamics in a nonzero background flow field

Cours au sein d'ecoles:

• CIMPA summer school on multiscale computational methods and error control, IIT Kanpur, July 10-21, 2017: random homogenization, theoretical and numerical aspects
  
  
• EMS school and workshop on mathematics for multiscale phenomena, Banach center, Bedlewo, October 24-28, 2011: Some recent numerical approaches for random multiscale materials
  
  
• Ecole du GdR CHANT "Modeles micro-macro et cinetiques, fluides et problemes d'interfaces", Grenoble, 11-13 janvier 2006: Problemes multiechelles dans les solides cristallins: quelques exemples

Publications dans des revues à comité de lecture:

1. R.A. Biezemans, C. Le Bris, F. Legoll et A. Lozinski, MsFEM for advection-dominated problems in heterogeneous media: Stabilization via nonconforming variants, Computer Methods in Applied Mechanics and Engineering, vol. 433, part A, 117496 (2025).
   
   
2. F.-B. Cartiaux, F. Legoll, A. Libal et J. Reygner, Survival probability of structures under fatigue: a data-based approach, Probabilistic Engineering Mechanics, vol. 77, 103657 (2024).
   
   
3. V. Ehrlacher, F. Legoll, B. Stamm et S. Xiang, Embedded corrector problems for homogenization in linear elasticity, arxiv preprint 2307.03537 et HAL preprint 04157434.
   
   
4. S. Brisard, M. Bertin et F. Legoll, A variance reduction strategy for numerical random homogenization based on the equivalent inclusion method, Computer Methods in Applied Mechanics and Engineering, vol. 417, part A, 116389 (2023).
   
   
5. F.-B. Cartiaux, A. Ehrlacher, F. Legoll, A. Libal et J. Reygner, Probabilistic formulation of Miner's rule and application to structural fatigue, Probabilistic Engineering Mechanics, vol. 74, 103500 (2023).
   
   
6. O. Gorynina, F. Legoll, T. Lelievre et D. Perez, Combining machine-learned and empirical force fields with the parareal algorithm: application to the diffusion of atomistic defects, Comptes Rendus Mecanique, vol. 351 (S1), 479-503 (2023).
   
   
7. R.A. Biezemans, C. Le Bris, F. Legoll et A. Lozinski, Non-intrusive implementation of a wide variety of Multiscale Finite Element Methods, Comptes Rendus Mecanique, vol. 351 (S1), 135-180 (2023).
   
   
8. R.A. Biezemans, C. Le Bris, F. Legoll et A. Lozinski, Non-intrusive implementation of Multiscale Finite Element Methods: an illustrative example, Journal of Computational Physics, vol. 477, 111914 (2023).
   
   
9. L. Chamoin et F. Legoll, An introductory review on a posteriori error estimation in Finite Element computations, SIAM Review, vol. 65 (4), 963-1028 (2023).
   
   
10. F. Legoll, P.-L. Rothe, C. Le Bris et U. Hetmaniuk, An MsFEM approach enriched using Legendre polynomials, SIAM Multiscale Modeling and Simulation, vol. 20 (2), 798-834 (2022).
    
    
11. O. Gorynina, C. Le Bris et F. Legoll, Mathematical analysis of a coupling method for the practical computation of homogenized coefficients, Control, Optimisation and Calculus of Variations, vol. 28, 44 (2022).
    
    
12. F. Legoll, T. Lelievre et U. Sharma, An adaptive parareal algorithm: application to the simulation of molecular dynamics trajectories, SIAM Journal on Scientific Computing, vol. 44 (1), B146-B176 (2022).
    
    
13. O. Gorynina, C. Le Bris et F. Legoll, Some remarks on a coupling method for the practical computation of homogenized coefficients, SIAM Journal on Scientific Computing, vol. 43 (2), A1273-A1304 (2021).
    
    
14. F. Legoll, T. Lelievre, K. Myerscough et G. Samaey, Parareal computation of stochastic differential equations with time-scale separation: a numerical convergence study, Computing and Visualization in Science, vol. 23, 9 (2020).
    
    
15. L. Chamoin et F. Legoll, Goal-oriented error estimation and adaptivity in MsFEM computations, Computational Mechanics, vol. 67 (4), 1201-1228 (2021).
    
    
16. E. Cances, V. Ehrlacher, F. Legoll, B. Stamm et S. Xiang, An embedded corrector problem for homogenization. Part II: Algorithms and discretization, Journal of Computational Physics, vol. 407, 109254 (2020).
    
    
17. F. Legoll, T. Lelievre et U. Sharma, Effective dynamics for non-reversible stochastic differential equations: a quantitative study, Nonlinearity, vol. 32 (12), 4779-4816 (2019).
    
    
18. E. Cances, V. Ehrlacher, F. Legoll, B. Stamm et S. Xiang, An embedded corrector problem for homogenization. Part I: Theory, SIAM Multiscale Modeling and Simulation, vol. 18 (3), 1179-1209 (2020).
    
    
19. T. Hudson, F. Legoll et T. Lelievre, Stochastic homogenization of a scalar viscoelastic model exhibiting stress-strain hysteresis, Mathematical Modelling and Numerical Analysis, vol. 54 (3), 879-928 (2020).
    
    
20. C. Le Bris, F. Legoll et F. Madiot, Multiscale Finite Element methods for advection-dominated problems in perforated domains, SIAM Multiscale Modeling and Simulation, vol. 17 (2), 773-825 (2019).
    
    
21. L. Chamoin et F. Legoll, A posteriori error estimation and adaptive strategy for the control of MsFEM computations, Computer Methods in Applied Mechanics and Engineering, vol. 336, 1-38 (2018).
    
    
22. M. Josien, Y.-P. Pellegrini, F. Legoll et C. Le Bris, Fourier-based numerical approximation of the Weertman equation for moving dislocations, International Journal for Numerical Methods in Engineering, vol. 113 (12), 1827-1850 (2018).
    
    
23. C. Le Bris, F. Legoll et S. Lemaire, On the best constant matrix approximating an oscillatory matrix-valued coefficient in divergence-form operators, Control, Optimisation and Calculus of Variations, vol. 24 (4), 1345-1380 (2018).
    
    
24. C. Le Bris, F. Legoll et F. Madiot, Stable approximation of the advection-diffusion equation using the invariant measure, arxiv preprint 1609.04777 et HAL preprint 01367417.
    
    
25. F. Legoll, T. Lelievre et S. Olla, Pathwise estimates for an effective dynamics, Stochastic Processes and their Applications, vol. 127 (9), 2841-2863 (2017).
    
    
26. C. Le Bris et F. Legoll, Examples of computational approaches for elliptic, possibly multiscale PDEs with random inputs, Journal of Computational Physics, vol. 328, 455-473 (2017).
    
    
27. C. Le Bris, F. Legoll et F. Madiot, Stabilisation de problemes non coercifs via une methode numerique utilisant la mesure invariante (Stabilization of non-coercive problems using the invariant measure), C. R. Acad. Sci. Paris, Serie I, vol. 354 (8), 799-803 (2016).
    
    
28. T. Jourdan, G. Stoltz, F. Legoll et L. Monasse, An accurate scheme to solve cluster dynamics equations using a Fokker-Planck approach, Computer Physics Communications, vol. 207, 170-178 (2016).
    
    
29. C. Le Bris, F. Legoll et F. Madiot, A numerical comparison of some Multiscale Finite Element approaches for advection-dominated problems in heterogeneous media, Mathematical Modelling and Numerical Analysis, vol. 51 (3), 851-888 (2017) (version anterieure etendue: arxiv preprint 1511.08453 et HAL preprint 01235642).
    
    
30. X. Blanc, C. Le Bris et F. Legoll, Some variance reduction methods for numerical stochastic homogenization, Philosophical Transactions of the Royal Society A, vol. 374 (2066), 20150168 (2016).
    
    
31. C. Le Bris, F. Legoll et W. Minvielle, Special Quasirandom Structures: a selection approach for stochastic homogenization, Monte Carlo Methods and Applications, vol. 22 (1), 25-54 (2016).
    
    
32. I.G. Tejada, L. Brochard, T. Lelièvre, G. Stoltz, F. Legoll et E. Cancès, Coupling a reactive potential with a harmonic approximation for atomistic simulations of material failure, Computer Methods in Applied Mechanics and Engineering, vol. 305, 422-440 (2016).
    
    
33. K. Sab, F. Legoll et S. Forest, Stress Gradient elasticity theory: existence and uniqueness of solution, J. of Elasticity, vol. 123 (2), 179-201 (2016).
    
    
34. E. Cancès, V. Ehrlacher, F. Legoll et B. Stamm, An embedded corrector problem to approximate the homogenized coefficients of an elliptic equation, C. R. Acad. Sci. Paris, Série I, vol. 353 (9), 801-806 (2015).
    
    
35. S. Brisard et F. Legoll, Periodic homogenization using the Lippmann--Schwinger formalism, arxiv preprint 1411.0330 et HAL preprint 01080251.
    
    
36. I.G. Tejada, L. Brochard, G. Stoltz, F. Legoll, T. Lelièvre et E. Cancès, Combining a reactive potential with a harmonic approximation for molecular dynamics simulation of failure: construction of a reduced potential, Proceedings of the 2014 IC-MSQUARE conference, Journal of Physics: Conference Series, vol. 574, 012041 (2015).
    
    
37. F. Legoll et W. Minvielle, A control variate approach based on a defect-type theory for variance reduction in stochastic homogenization, SIAM Multiscale Modeling and Simulation, vol. 13 (2), 519-550 (2015).
    
    
38. F. Legoll, W. Minvielle, A. Obliger et M. Simon, A parameter identification problem in stochastic homogenization, ESAIM Proceedings, vol. 48, 190-214 (2015).
    
    
39. C. Le Bris, F. Legoll et A. Lozinski, An MsFEM type approach for perforated domains, SIAM Multiscale Modeling and Simulation, vol. 12 (3), 1046-1077 (2014).
    
    
40. C. Le Bris, F. Legoll et K. Li, Approximation grossière d'un problème elliptique à coefficients hautement oscillants (Coarse approximation of an elliptic problem with highly oscillatory coefficients), C. R. Acad. Sci. Paris, Série I, vol. 351 (7-8), 265-270 (2013).
    
    
41. F. Legoll et W. Minvielle, Variance reduction using antithetic variables for a nonlinear convex stochastic homogenization problem, Discrete and Continuous Dynamical Systems - S, vol. 8 (1), 1-27 (2015).
    
    
42. Y. Efendiev, C. Kronsbein et F. Legoll, Multi-Level Monte Carlo approaches for numerical homogenization, SIAM Multiscale Modeling and Simulation, vol. 13 (4), 1107-1135 (2015).
    
    
43. S. Lahbabi et F. Legoll, Effective dynamics for a kinetic Monte-Carlo model with slow and fast time scales, Journal of Statistical Physics, vol. 153 (6), 931-966 (2013).
    
    
44. F. Legoll et F. Thomines, On a variant of random homogenization theory: convergence of the residual process and approximation of the homogenized coefficients, Mathematical Modelling and Numerical Analysis, vol. 48 (2), 347-386 (2014).
    
    
45. C. Le Bris, F. Legoll et A. Lozinski, MsFEM à la Crouzeix-Raviart for highly oscillatory elliptic problems, Chinese Annals of Mathematics, Series B, vol. 34 (1), 113-138 (2013).
    
    Cet article a aussi été publié sous la référence suivante:
    
    C. Le Bris, F. Legoll et A. Lozinski, MsFEM à la Crouzeix-Raviart for highly oscillatory elliptic problems, in Partial Differential Equations: Theory, Control and Approximation, P. G. Ciarlet, T. Li, Y. Maday eds., Springer, 265-294 (2014).
    
    
46. E. B. Tadmor, F. Legoll, W. K. Kim, L. M. Dupuy et R. E. Miller, Finite-Temperature Quasi-Continuum, Applied Mechanics Reviews, vol. 65 (1), 010803 (2013).
    
    
47. F. Legoll, T. Lelièvre et G. Samaey, A micro-macro parareal algorithm: application to singularly perturbed ordinary differential equations, SIAM Journal on Scientific Computing, vol. 35 (4), A1951-A1986 (2013).
    
    
48. M. Dobson, F. Legoll, T. Lelièvre et G. Stoltz, Derivation of Langevin Dynamics in a nonzero Background Flow Field, Mathematical Modelling and Numerical Analysis, vol. 47 (6), 1583-1626 (2013).
    
    
49. C. Le Bris, F. Legoll et F. Thomines, Multiscale Finite Element approach for "weakly" random problems and related issues, Mathematical Modelling and Numerical Analysis, vol. 48 (3), 815-858 (2014).
    
    
50. C. Le Bris, F. Legoll et F. Thomines, Rate of convergence of a two-scale expansion for some "weakly" stochastic homogenization problems, Asymptotic Analysis, vol. 80 (3-4), 237-267 (2012).
    
    
51. X. Blanc, F. Legoll et A. Anantharaman, Asymptotic behaviour of Green functions of divergence form operators with periodic coefficients, Applied Mathematics Research Express, vol. 2013 (1), 79-101 (2013).
    
    
52. X. Blanc et F. Legoll, A numerical strategy for coarse-graining two-dimensional atomistic models at finite temperature: the membrane case, Computational Materials Science, vol. 66, 84-95 (2013).
    
    
53. A. Iacobucci, F. Legoll, S. Olla et G. Stoltz, Negative thermal conductivity of chains of rotors with mechanical forcing, Phys. Rev. E, vol. 84 (6), 061108 (2011).
    
    
54. X. Dai, C. Le Bris, F. Legoll et Y. Maday, Symmetric parareal algorithms for Hamiltonian systems, Mathematical Modelling and Numerical Analysis, vol. 47 (3), 717-742 (2013).
    
    
55. F. Legoll et T. Lelièvre, Some remarks on free energy and coarse-graining, in Numerical Analysis of Multiscale Computations, B. Engquist, O. Runborg, R. Tsai eds., Lect. Notes Comput. Sci. Eng., vol. 82, Springer, 279-329 (2012).
    
    
56. F. Legoll et T. Lelièvre, Effective dynamics using conditional expectations, Nonlinearity, vol. 23 (9), 2131-2163 (2010).
    
    
57. M. Dobson, C. Le Bris et F. Legoll, Symplectic schemes for highly oscillatory Hamiltonian systems: the homogenization approach beyond the constant frequency case, IMA Journal of Numerical Analysis, vol. 33 (1), 30-56 (2013) (version antérieure étendue: arxiv preprint 1008.1030 et HAL 00524814).
    
    
58. A. Anantharaman, R. Costaouec, C. Le Bris, F. Legoll et F. Thomines, Introduction to numerical stochastic homogenization and the related computational challenges: some recent developments, W. Bao and Q. Du eds., Lecture Notes Series, Institute for Mathematical Sciences, National University of Singapore, volume 22, 197-272 (2011).
    
    
59. X. Blanc, R. Costaouec, C. Le Bris et F. Legoll, Variance reduction in stochastic homogenization using antithetic variables, Markov Processes and Related Fields, vol. 18 (1), 31-66 (2012) (lien).
    
    
60. X. Blanc, R. Costaouec, C. Le Bris et F. Legoll, Variance reduction in stochastic homogenization: the technique of antithetic variables, in Numerical Analysis of Multiscale Computations, B. Engquist, O. Runborg, R. Tsai eds., Lect. Notes Comput. Sci. Eng., vol. 82, Springer, 47-70 (2012).
    
    
61. M. Dobson, C. Le Bris et F. Legoll, Symplectic schemes for highly oscillatory Hamiltonian systems with varying fast frequencies (Intégrateurs symplectiques pour des systèmes Hamiltoniens hautement oscillants avec fréquences rapides variables), C. R. Acad. Sci. Paris, Série I, vol. 348 (17-18), 1033-1038 (2010).
    
    
62. C. Le Bris et F. Legoll, Integrators for highly oscillatory Hamiltonian systems: an homogenization approach, Discrete and Continuous Dynamical Systems - B, vol. 13 (2), 347-373 (2010) (version antérieure étendue: preprint HAL 00165293).
    
    
63. X. Blanc, C. Le Bris, F. Legoll et C. Patz, Finite-temperature coarse-graining of one-dimensional models: mathematical analysis and computational approaches, Journal of Nonlinear Science, vol. 20 (2), 241-275 (2010).
    
    
64. R. Costaouec, C. Le Bris et F. Legoll, Variance reduction in stochastic homogenization: proof of concept, using antithetic variables, Boletin Soc. Esp. Mat. Apl., vol. 50, 9-27 (2010).
    
    
65. A. Iacobucci, F. Legoll, S. Olla et G. Stoltz, Thermal conductivity of the Toda lattice with conservative noise, Journal of Statistical Physics, vol. 140 (2), 336-348 (2010).
    
    
66. X. Blanc, C. Le Bris, F. Legoll et T. Lelièvre, Beyond multiscale and mutiphysics: multimaths for model coupling, Networks and Heterogeneous Media, vol. 5 (3), 423-460 (2010).
    
    
67. B. Dickson, F. Legoll, T. Lelièvre, G. Stoltz et P. Fleurat-Lessard, Free energy calculations: An efficient adaptive biasing potential method, Journal of Physical Chemistry B, vol. 114 (17), 5823-5830 (2010).
    
    
68. R. Costaouec, C. Le Bris et F. Legoll, Approximation numérique d'une classe de problèmes en homogénéisation stochastique (Numerical approximation of a class of problems in stochastic homogenization), C. R. Acad. Sci. Paris, Série I, vol. 348 (1-2), 99-103 (2010).
    
    
69. F. Legoll, Multiscale methods coupling atomistic and continuum mechanics: some examples of mathematical analysis, in Analytical and Numerical Aspects of Partial Differential Equations, E. Emmrich et P. Wittbold eds., de Gruyter Proceedings in Mathematics, 193-245 (2009).
    
    
70. F. Legoll, M. Luskin et R. Moeckel, Non-ergodicity of Nosé-Hoover dynamics, Nonlinearity, vol. 22 (7), 1673-1694 (2009).
    
    
71. M. Hammoud, D. Duhamel, K. Sab et F. Legoll, Coupled Discrete and Continuum Approach to the Behavior of Ballast, Ninth International Conference on Computational Structures Technology proceeding, Athènes (septembre 2008).
    
    
72. E. Cancès, F. Legoll, M.-C. Marinica, K. Minoukadeh et F. Willaime, Some improvements of the activation-relaxation technique method for finding transition pathways on potential energy surfaces, Journal of Chemical Physics, vol. 130 (11), 114711 (2009).
    
    
73. B. Leimkuhler, F. Legoll et E. Noorizadeh, A temperature control technique for nonequilibrium molecular simulation, Journal of Chemical Physics, vol. 128 (7), 074105 (2008).
    
    
74. F. Legoll, T. Lelièvre et G. Stoltz, Some remarks on sampling methods in molecular dynamics, ESAIM Proceedings, vol. 22, 217-233 (2008).
    
    
75. C. Le Bris et F. Legoll, Dérivation de schémas numériques symplectiques pour des systèmes hamiltoniens hautement oscillants (derivation of symplectic numerical schemes for highly oscillatory hamiltonian systems), C. R. Acad. Sci. Paris, Série I, vol. 344 (4), 277-282 (2007).
    
    
76. F. Legoll, M. Luskin et R. Moeckel, Non-ergodicity of the Nosé-Hoover Thermostatted Harmonic Oscillator, Archive for Rational Mechanics and Analysis, vol. 184 (3), 449-463 (2007).
    
    
77. E. Cancès, F. Legoll et G. Stoltz, Theoretical and numerical comparison of some sampling methods for molecular dynamics, Mathematical Modelling and Numerical Analysis, vol. 41 (2), 351-389 (2007).
    
    
78. X. Blanc, C. Le Bris et F. Legoll, Analysis of a prototypical multiscale method coupling atomistic and continuum mechanics: the convex case, Acta Mathematicae Applicatae Sinica, vol. 23 (2), 209-216 (2007).
    
    
79. X. Blanc, C. Le Bris et F. Legoll, Analysis of a prototypical multiscale method coupling atomistic and continuum mechanics, Mathematical Modelling and Numerical Analysis, vol. 39 (4), 797-826 (2005).
    
    
80. F. Legoll, Numerical homogenization of nonlinear viscoplastic two-dimensional polycrystals, Computational and Applied Mathematics, vol. 23 (2-3), 309-325 (2004).
    
    
81. E. Cancès, F. Castella, Ph. Chartier, E. Faou, C. Le Bris, F. Legoll et G. Turinici, High-order averaging schemes with error bounds for thermodynamical properties calculations by molecular dynamics simulations, Journal of Chemical Physics, vol. 121 (21), 10346-10355 (2004).
    
    
82. E. Cancès, F. Castella, Ph. Chartier, E. Faou, C. Le Bris, F. Legoll et G. Turinici, Long-time averaging for integrable Hamiltonian dynamics, Numerische Mathematik, vol. 100 (2), 211-232 (2005).
    
    
83. F. Legoll et R. Monneau, Designing reversible measure invariant algorithms with applications to molecular dynamics, Journal of Chemical Physics, vol. 117 (23), 10452-10464 (2002).

Organisation de conférences / mini-symposium:

• avec A. Lozinski (U. Besancon), nous co-organisons une ecole et un workshop sur le sujet Reduced-Order Modeling for Complex Engineering Problems au sein du IMSI institute, 29 janvier - 7 fevrier 2025, Chicago.


• Congres CANUM 2024, 27-31 mai 2024, Ile de Re: avec L. Balazi (CEA et CMAP) et P. Omnes (CEA), nous co-organisons le mini-symposium "Methodes multi-echelles pour les EDP".


• Conference SIAM UQ 2024, 27 fevrier - 1 mars 2024, Trieste: avec G. Samaey (Leuven), nous avons co-organise le mini-symposium "Multilevel and asymptotic-preserving methods for uncertainty quantification in multiscale systems".


• Conference COMPLAS 2023, 5-7 septembre 2023, Barcelone: avec J. Zeman (Prague), nous avons co-organise la session invitee "Computational approaches for heterogeneous materials".


• Conference SIAM CSE 2023, 26 fevrier - 3 mars 2023, Amsterdam: avec A. Lozinski (U. Besancon), nous avons co-organise le mini-symposium "Computational approaches for multiscale problems and their applications".


• Conference ICIAM 2019, 15-19 juillet 2019, Valencia: avec C. Le Bris (ENPC), nous avons co-organise le mini-symposium "Computational approaches for multiscale, possibly random problems".


• Conference SIAM CSE 2019, 25 fevrier - 1 mars 2019, Spokane: avec U. Hetmaniuk (U. of Washington), nous avons co-organise le mini-symposium "Multiscale and domain decomposition approaches for PDEs with rough coefficients".


• Conference SciCADE 2017, 11-15 septembre 2017, Bath: avec A. Abdulle (EPFL), nous avons co-organise le mini-symposium "Multiscale modelling: numerical methods and applications".


• Membre du comite scientifique SciCADE 2017.


• 14th U.S. National Congress on Computational Mechanics, 17-20 juillet 2017, Montreal: avec L. Chamoin (LMT Cachan) et K. Van der Zee (Nottingham), nous avons co-organise le mini-symposium "Adaptivity for multiscale problems".


• 8th International Conference on Multiscale Materials Modeling, 10-14 octobre 2016, Dijon: avec W. Curtin (EPFL), C. Garcia-Cervera (UCSB), J. Kermode (Warwick), X. Li (Penn State), A. Lozinski (Besancon), M. Luskin (Minneapolis) et C. Ortner (Warwick), nous avons co-organise le mini-symposium "Mathematical theory and computational techniques for multiscale materials modeling".


• Membre du comite scientifique SciCADE 2015.


• Workshop Stochastic and multiscale inverse problems (ENPC, 2-3 octobre 2014), organisé avec Virginie Ehrlacher, Tony Lelièvre et Karam Sab.


• Conférence SciCADE 2013, 16-20 septembre 2013, Valladolid: avec Yvon Maday (Paris 6), nous avons co-organisé un mini-symposium sur "Recent advances on parareal algorithms".


• 12th U.S. National Congress on Computational Mechanics (12th USNCCM), 22-25 juillet 2013, Raleigh: avec Régis Cottereau (Centrale Paris), Lori Graham-Brady (Johns Hopkins) et Martin Ostoja-Starzewski (U. of Illinois), nous avons co-organisé un mini-symposium sur "Multi-scale methods for heterogeneous materials".


• 12th U.S. National Congress on Computational Mechanics (12th USNCCM), 22-25 juillet 2013, Raleigh: avec Brent Kraczek (US Army Research Laboratory), Reese Jones (Sandia National Laboratories) et Kranthi Mandadapu (Sandia National Laboratories), nous avons co-organisé un mini-symposium sur "The atomistic basis of non-equilibrium thermal processes in materials".


• 22nd International Workshop on Computational Mechanics of Materials (IWCMM XXII), 24-26 septembre 2012, Baltimore: avec Brent Kraczek (US Army Research Laboratory), Reese Jones (Sandia National Laboratories) et Kranthi Mandadapu (Sandia National Laboratories), nous avons co-organisé un mini-symposium sur "Atomistic basis of thermal processes in driven systems".


• avec E. Faou, T. Lelièvre et G. Stoltz, nous avons co-organisé une Ecole CEA-EDF-INRIA sur Simulation of hybrid dynamical systems and applications to molecular dynamics, 27-30 septembre 2010, IHP (le programme est disponible ici).


• Dynamics Days Europe 2010, 6-10 septembre 2010, Bristol: avec B. Leimkuhler, nous avons co-organisé un mini-symposium sur "Molecular Dynamics".


• Multiscale Molecular Modelling conference, 30 juin - 3 juillet 2010, Edinburgh: avec T. Lelièvre, nous avons co-organisé un mini-symposium sur "Coarse-graining and effective dynamics in molecular simulation".


• 4th European Conference on Computational Mechanics, 16-21 mai 2010, Paris: avec H. Ben Dhia (Centrale Paris), F. Feyel (Onera and ENSMP) et V. Kouznetsova (TU Eindhoven), nous avons co-organisé un mini-symposium sur "Arlequin, FE2 and other embedded domains methods for multimodel and multiscale mechanical problems: advances, analyses and computation of challenging fine scales applications".


• Mini-symposium Numerical methods and their applications in molecular simulation (Conférence ICNAAM 2009, Crète, 18-22 septembre 2009), organisé avec E. Cancès.


• Mini-symposium "Multimodel and Multiscale Approaches in Solid Mechanics: Algorithms and Applications Advances" (10th US National Congress on Computational Mechanics, Columbus, 16-19 juillet 2009), organisé avec H. Ben Dhia.


• Workshop Numerical methods in molecular simulation (HIM, Bonn, 7-11 avril 2008), organisé avec Tony Lelièvre, Mathias Rousset et Gabriel Stoltz.


• Workshop Modèles et méthodes numériques pour les milieux granulaires (ENPC, 19-21 novembre 2007), organisé avec François Castella dans le cadre du GdR CHANT.


• Mini-symposium Dynamique moléculaire (conférence SciCADE 2007, Saint-Malo, 9-13 juillet 2007), organisé avec Eric Darve.


• Conférence Molecular simulation: algorithmic and mathematical aspects (IHP, 1-3 décembre 2004).


• Workshop PRESTISSIMO (IHP, 11-12 décembre 2003), sur le thème Dynamique moléculaire et intégration en temps long.

Séjours à l'étranger:

• IPAM Los Angeles, automne 2017: 4 semaines (core participant au sein du programme "Complex high-dimensional energy landscapes", Sept.-Dec. 2017).
  
  
• IPAM Los Angeles, décembre 2012: 3 semaines (core participant au sein du programme ``Materials Defects'', Sept.-Dec. 2012).
  
  
• Texas A & M University, décembre 2011: 2 semaines (collaboration avec Y. Efendiev).
  
  
• Minneapolis, mai 2009: 3 semaines à l'IMA (Institute for Mathematics and its Applications).
  
  
• Berlin, juillet 2008: 3 semaines à la Technische Universität, dans le cadre du programme Analytical and numerical aspects of partial differential equations.
  
  
• Bonn, printemps 2008: 3 semaines dans le cadre du HIM Junior Trimester Program on Computational Mathematics (Numerical methods in molecular simulation, organisé avec Tony Lelièvre, Mathias Rousset et Gabriel Stoltz).
  
  
• Minneapolis, avril 2006: 3 semaines à l'IMA (Institute for Mathematics and its Applications).

Enseignement:

• depuis sept. 2021: responsable du cours Equations aux Derivees Partielles: Approches Variationnelles (15h en premiere annee de l'ENPC).
  • La page web du cours.


• depuis sept. 2023: cours EDP et modélisation (M2 Mathématiques et Applications, Université Pierre et Marie Curie Paris 6).
  • La page web du cours sur le site de Sorbonne Universite (cf. aussi ma page web pour les notes de cours, des informations pratiques, ...).


• sept. 2018 -- : cours Problemes d'evolution (30h en deuxieme annee de l'ENPC, departement IMI).
  • La page web du cours.

Liens

• les séminaires du CERMICS.
• le CEMRACS 2004 (mathématiques et applications en biologie et en médecine), organisé par Eric Cancès et Jean-Frédéric Gerbeau.
• le CEMRACS 2001 (problèmes multi-échelles), organisé par Yves Achdou, Claude Le Bris et Frédéric Nataf.
  
  
• si la physique nucléaire vous intéresse, vous trouverez ici quelques extraits d'un travail effectué avec Paul Bonche (CEA Saclay).
  
  
• Xavier Blanc
• Eric Cancès
• François Castella
• Philippe Chartier
• Erwan Faou
• Claude Le Bris
• Mathieu Lewin
• Mitchell Luskin
• Yvon Maday
• Richard Moeckel
• Gabriel Stoltz
• Gabriel Turinici