Guillaume SYLVAND (CONCACE)

• Numerical Linear Algebra and High Performance Computing (with on focus on applications to aerospace industry);
• Solvers for Large Linear Systems (with advanced numerical methods such as Fast Multipole Methods);
• Iterative Solvers and Preconditionners (especially for linear systems coming from finite element and boundary element methods);
• Direct Solvers for Dense, Sparse and Hierarchical Matrices (and matrices mixing sparse and dense/compressed parts);
• More recently: Quasi-Trefftz Methods for Aeroacoustics (in collaboration with Lise-Marie Imbert-Gerard mailto:lmig@math.arizona.edu and the MAKUTU Inria team in Pau);
• Heterogeneous Computing.

I'm part of the Paris concace Team, located in the Airbus CRT/VPE building of Issy-Les-Moulineaux.

Airbus CRT/VPE
22 Rue du Gouverneur Général ÉBOUÉ,
Bât. Colisée EDEN - 4th Floor,
92130 Issy-Les-Moulineaux

How to get there

• mailto:guillaume.sylvand@airbus.com

• Sylvand, G.. Performance of a parallel implementation of the FMM for electromagnetics applications.. International journal for numerical methods in fluids, 43(8), 2003, pages 865-879
• Delnevo, A., Le Saint, S., Sylvand, G., Terrasse, I.. Numerical methods: Fast multipole method for shielding effects.. AIAA Paper, 2971, 2005
• Carpentieri, B., Duff, I. S., Giraud, L., Sylvand, G.. Combining fast multipole techniques and an approximate inverse preconditioner for large electromagnetism calculations.. SIAM Journal on Scientific Computing, 27(3), 2005, pages 774-792
• Alléon, G., Champagneux, S., Chevalier, G., Giraud, L., Sylvand, G.. Parallel distributed numerical simulations in aeronautic applications.. Applied Mathematical Modelling, 30(8), 2006-08, pages 714-730
• Giraud, L., Langou, J., Sylvand, G.. On the parallel solution of large industrial wave propagation problems.. Journal of Computational Acoustics, 14(1), 2006, pages 83-111
• Casenave, Fabien, Ern, Alexandre, Sylvand, Guillaume. Coupled BEM–FEM for the convected Helmholtz equation with non-uniform flow in a bounded domain.. Journal of Computational Physics, 257, 2014-01-15, pages 627-644 https://arxiv.org/pdf/1303.6923
• Bramas, Berenger, Coulaud, Olivier, Sylvand, Guillaume. Time-domain BEM for the wave equation on distributed-heterogeneous architectures: A blocking approach.. Parallel Computing, 49, 2015-11, pages 66-82
• Imbert-Gérard, Lise-Marie, Sylvand, Guillaume. A roadmap for Generalized Plane Waves and their interpolation properties.. Numerische Mathematik, 149(1), 2021, pages 87-137 https://arxiv.org/abs/1907.08309
• Imbert-Gerard, Lise-Marie, Sylvand, Guillaume. Three types of quasi-Trefftz functions for the 3D convected Helmholtz equation: construction and approximation properties. https://arxiv.org/abs/2201.12993

• Sylvand, Guillaume. Équation des Ondes en Acoustique : Accélération des Potentiels Retardés par la Méthode Multipôle Temporelle.. RR-5017, INRIA, 2003 https://inria.hal.science/inria-00071567/file/RR-5017.pdf
• Alleon, Guillaume, Barbier, Denis, Sylvand, Guillaume. A high performance 3D simulation framework for acoustics : from mesh to visualization. https://cerfacs.fr/wp-content/uploads/2017/06/alleon.pdf
• Chaigne, S., Sylvand, G., Duceau, E., Simon, J.. On the use of the Fast Multipole Method for Accurate Automotive Body Panel Acoustic Load Predictions.. 2007-01-2313, SAE Technical Paper
• Casenave, Fabien, Ern, Alexandre, Lelièvre, Tony, Sylvand, Guillaume. A nonintrusive method to approximate linear systems with nonlinear parameter dependence.. Technical Report, 2013-07 https://arxiv.org/abs/1307.4330
• Bramas, Bérenger, Coulaud, Olivier, Sylvand, Guillaume. Time-Domain BEM for the Wave Equation on Distributed-Heterogenous Architectures : a Blocking Approach.. RR-8604, Inria Bordeaux Sud-Ouest; INRIA, 2014 https://inria.hal.science/hal-01070069/file/RR-8604.pdf
• Carratalá-Sáez, R., Faverge, M., Pichon, G., Sylvand, G., Quintana-Ortí, E.S.. Tiled Algorithms for Efficient Task-Parallel H-Matrix Solvers. RR-9327, Inria, 2020 https://inria.hal.science/hal-02489269/file/RR-9327.pdf
• Agullo, E., Felšöci, M., Sylvand, G.. A comparison of selected solvers for coupled FEM/BEM linear systems arising from discretization of aeroacoustic problems.. RR-9412, Inria Bordeaux Sud-Ouest, 2021 https://inria.hal.science/hal-03263603/file/RR-9412.pdf
• Agullo, E., Felšöci, M., Sylvand, G.. A comparison of selected solvers for coupled FEM/BEM linear systems arising from discretization of aeroacoustic problems: literate and reproducible environment.. RT-0513, Inria Bordeaux Sud-Ouest, 2021 https://inria.hal.science/hal-03263620
• Agullo, E., Felšöci, M., Sylvand, G.. Direct solution of larger coupled sparse/dense linear systems using low-rank compression on single-node multi-core machines in an industrial context.. RR-9453, Inria Bordeaux Sud-Ouest, 2022, pages 25 https://inria.hal.science/hal-03557692/file/RR-9453.pdf
• Agullo, E., Felšöci, M., Guermouche, A., Mathieu, H., Sylvand, G., Tagliaro, B.. Study of the processor and memory power consumption of coupled sparse/dense solvers.. RR-9463, Inria Bordeaux Sud-Ouest, 2022 https://inria.hal.science/hal-03589695/file/RR-9463.pdf
• Agullo, E., Felšöci, M., Sylvand, G.. Parallel distributed out-of-core coupled solvers for large sparse/dense FEM/BEM linear systems implementing low-rank compression.. RR-9550, Inria Bordeaux - Sud-Ouest, 2024 https://inria.hal.science/hal-04618349/file/RR-9550.pdf
• Imbert-Gérard, Lise-Marie, Lagardère, Andréa, Sylvand, Guillaume, Tordeux, Sébastien. Quasi-Trefftz spaces for a first-order formulation of the Helmholtz equation.. 2025 https://arxiv.org/pdf/2509.08936
• Imbert-Gérard, Lise-Marie, Lagardère, Andréa, Sylvand, Guillaume, Tordeux, Sébastien. Quasi-Trefftz Method for Aeroacoustics: Part I - Model Problem and Application to the Helmholtz Equation.. RR-9587, Inria Bordeaux - Sud Ouest, 2026 https://inria.hal.science/hal-05053699/file/RR-9587_v3.pdf
• Agullo, Emmanuel, Peaucelle, Clément, Sylvand, Guillaume. Memory-Time Trade-offs for Floating-Point Compression in Industrial Hierarchical Matrix Solvers.. RR-9620, Inria Bordeaux - Sud Ouest; Airbus, 2026 https://hal.science/hal-05662203/file/RR-9620.pdf
• Lagardère, Andréa, Imbert-Gérard, Lise-Marie, Sylvand, Guillaume, Tordeux, Sébastien. Quasi-Trefftz Method for Aeroacoustics: Part II – Convected Helmholtz Equation and Non-Uniform Flows.. RR-9622, Inria Bordeaux - Sud Ouest, 2026 https://inria.hal.science/hal-05695730/file/RR-9622.pdf
• Agullo, Emmanuel, Bisch, Joanna, Sylvand, Guillaume. Bridging the Gap Between Adaptive Cross Approximation and Rank-Revealing LU.. RR-9621, Inria Bordeaux - Sud Ouest, 2026 https://hal.science/hal-05679076/file/LU_ACA_report.pdf

• Balin, Nolwenn, Sylvand, Guillaume, Casenave, Fabien. 3D FEM-BEM coupled resolution for acoustic waves propagation in potential flow.. Société Française d'Acoustique. Acoustics 2012, Nantes, France, 2012-04 https://hal.science/hal-00810705/file/hal-00810705.pdf
• Carpentieri, B., Duff, I., Giraud, L., Sylvand, G.. Inner-outer iterations: a way to design robust linear solvers for dense linear systems in electromagnetism.. Latsis Symposium on Iterative Solvers for Large Linear Systems, 2002-02, pages 18-21
• Sylvand, G.. Complex industrial computations in electromagnetism using the fast multipole method.. Mathematical and Numerical Aspects of Wave Propagation WAVES 2003, Springer Berlin Heidelberg, 2003, pages 657-662
• Alléon, G., Carpentieri, B., Duff, I. S., Giraud, L., Martin, E., Sylvand, G.. Efficient parallel iterative solvers for the solution of large dense linear systems arising from the boundary element method in electromagnetism.. Proceedings of the International Conference on Supercomputing in Nuclear Application (SNA), 2003-09
• Carpentieri, Bruno, Duff, Iain, Giraud, Luc, Sylvand, Guillaume. An Embedded Iterative Scheme in Electromagnetism.. Parallel Processing and Applied Mathematics, 5th International Conference, PPAM 2003, Czestochowa, Poland, 2003-09
• Carpentieri, Bruno, Duff, Iain S., Giraud, Luc, Sylvand, Guillaume. An Embedded Iterative Scheme in Electromagnetism.. Parallel Processing and Applied Mathematics, 3019, 2004, pages 977-984
• Thain, A., Peres, G., Estienne, J. P., Sylvand, G., Cailleu, P., Benjamin, P., Sabanowski, G.. Numerical modelling of aircraft antenna installations.. Antennas and Propagation, 2007. EuCAP 2007. The Second European Conference on, IET, 2007-11, pages 1-6
• Casenave, F., Balin, N., Sylvand, G.. 3D Coupled resolution of acoustics waves propagation between a potential flow and a uniform flow.. Waves Conference, 2011, 2011
• Lizé, B., Sylvand, Guillaume. Design, Analysis, Implementation and Deployment of a High-Performance, Out-of-Core, Parallel, Dense Direct Linear Solver.. The Second International Conference on Parallel, Distributed, Grid and Cloud Computing for Engineering, 2011-01
• Fukata, S., Hayama, K., Sylvand, G., Alestra, S., Azuma, T.. Study of jet noise source modeling and shielding effect for future aircraft.. INTER-NOISE and NOISE-CON Congress and Conference Proceedings, 2011(3), Institute of Noise Control Engineering, 2011-07, pages 3910-3915
• Sylvand, Guillaume. From Quasi-static to High Frequencies : An Overview of Numerical Simulation at EADS.. Scientific Computing in Electrical Engineering SCEE 2010, doi: 10.1007/978-3-642-22453-9-9
• Lize, B., Sylvand, G., Agullo, E., Thibault, S.. A task-based H-matrix solver for acoustic and electromagnetic problems on multicore architectures.. SciCADE, the International Conference on Scientific Computation and Differential Equations, Valladolid, Spain, 2013
• Hayama, Kenji, Fukata, Satoshi, Sylvand, Guillaume, Alestra, Stephane, Azuma, Toshihiko. Jet Noise Source Modeling Suited to Estimate a Shielding Effect.. 19th AIAA/CEAS Aeroacoustics Conference, 2013-05
• Casenave, Fabien, Ern, Alexandre, Lelièvre, Tony, Sylvand, Guillaume. Reduced basis strategies for aeroacoustics simulations.. 11th International Conference on Mathematical and Numerical Aspects of Waves (WAVES 2011), 2013-06
• Bramas, Bérenger, Coulaud, Olivier, Sylvand, Guillaume. Time-Domain BEM for the Wave Equation: Optimization and Hybrid Parallelization.. Europar 2014 - European Conference on Parallel Processing, Porto, Portugal, 2014-08
• Bramas, Bérenger, Coulaud, Olivier, Sylvand, Guillaume. New Computational Ordering to Reach High Performance in the Time-domain BEM for the Wave Equation.. Sparse Days, Toulouse, France, 2014-06
• Piche, Sylvand, et al.. BEM/MoM fast direct computation for antenna sitting and antenna coupling on large aeronautic plateforms.. 2014 IEEE Conference on Antenna Measurements & Applications (CAMA), Antibes Juan-les-Pins, France, 2014, pages 1-4, doi: 10.1109/CAMA.2014.7003376
• Blanchard, P., Bramas, B., Coulaud, O., Darve, E., Dupuy, L., Etcheverry, A., Sylvand, G.. ScalFMM: A Generic Parallel Fast Multipole Library.. Computational Science and Engineering - SIAM CSE 2015, Salt Lake City, United States, 2015-03
• Agullo, E., Falco, A., Giraud, L., Lizé, B., Sylvand, G.. H-Matrix Solver for FEM/BEM. CIMI Workshop on Fast Direct Solvers, Toulouse, France, 2015-06
• Agullo, E., Falco, A., Giraud, L., Lizé, B., Sylvand, G.. H-Matrix Solver for FEM/BEM.. Workshop on Fast Direct Solvers at Computational Science and Engineering (CSE15), 2015-06
• Sylvand, G.. Fast Methods applied to BEM Solvers for industrial problems. The 9th International Workshop on Parallel Matrix Algorithms and Applications (PMAA16), 2016-07
• Balin, Nolwenn, Sylvand, Guillaume, Robert, Jerome. Fast Methods applied to BEM Solvers for Acoustic Propagation Problems.. 22nd AIAA/CEAS Aeroacoustics Conference, 2016-05
• Piche, Sylvand, et al.. BEM/MoM fast direct computation for RCS and ISAR applications.. 2016 10th European Conference on Antennas and Propagation (EuCAP), Davos, Switzerland, 2016, pages 1-5, doi: 10.1109/EuCAP.2016.7481631
• Agullo, E., Falco, A., Giraud, L., Sylvand, G.. Vers une factorisation symbolique hiérarchique de rang faible pour des matrices creuses. Conférence d’informatique en Parallélisme, Architecture et Système (ComPAS'17), Sophia Antipolis, France, 2017-06 https://inria.hal.science/hal-01597072/file/report.pdf
• Falco, A, Agullo, E, Giraud, L, Sylvand, G. Hierarchical Symbolic Factorization for Sparse Matrices.. Sparse Days 2018, Toulouse, France, 2018-09 https://inria.hal.science/hal-01999895/file/sparse_days_2018_presentation.pdf
• Falco, A., Sylvand, G.. H-matrix Solver applied to Coupled FEM-BEM Aeroacoustics Simulations.. Sixth Chilean Workshop on Numerical Analysis of Partial Differential Equations (WONAPDE 2019), 2019-01
• Sylvand, G.. H-Matrix Solver Applied to Coupled FEM-BEM Aeroacoustics Simulations. Journées Ondes Sud-Ouest (JOSO), Le Barp, France, 2019-03 https://inria.hal.science/hal-02140403/file/H-matrix%20FEM-BEM%20JOSO%2012%20mars%202019.pdf
• Carratalá-Sáez, R., Faverge, M., Pichon, G., Sylvand, G., Quintana-Ortí, E. S.. Tiled Algorithms for Efficient Task-Parallel H-Matrix Solvers.. 2020 IEEE International Parallel and Distributed Processing Symposium Workshops (IPDPSW), New Orleans, LA, USA, 2020, pages 757-766, doi: 10.1109/IPDPSW50202.2020.00131 https://inria.hal.science/hal-02513433/file/paper_final.pdf
• Carratalá-Sáez, R., Faverge, M., Pichon, G., Quintana-Ortí, E. S., Sylvand, G.. Exploiting Generic Tiled Algorithms Toward Scalable H-Matrices Factorizations on Top of Runtime Systems. SIAM PP20 - SIAM Conference on Parallel Processing for Scientific Computing, Seattle, United States, 2020-02
• Agullo, E., Felšöci, M., Sylvand, G.. Comparison of coupled solvers for FEM/BEM linear systems arising from discretization of aeroacoustic problems.. COMPAS 2021 - Conférence francophone d’informatique en Parallélisme, Architecture et Système, 2021 https://inria.hal.science/hal-03264472/file/article-compas-2021.pdf
• Abboud, T., Chaigne, B., Felšöci, M., Piche, A., Sylvand, G.. Numerical Modelisation of Interaction between Plasma Thruster Plume and Antennas on Small Satellites.. Waves 2022 - International Conference on Mathematical and Numerical Aspects of Wave Propagation, 2022
• Piche, Alloatti, Lescoat, Sevoz, Perraud, Benjamin, Sylvand, Capet, Chaigne, Abboud. Management of Antenna Positioning and Radiofrequency Compatibility on Small Satellites.. 2022 ESA Workshop on Aerospace EMC (Aerospace EMC), Virtual, 2022, pages 01-05, doi: 10.23919/AerospaceEMC54301.2022.9828861
• Agullo, E., Felšöci, M., Sylvand, G.. Direct solution of larger coupled sparse/dense linear systems using low-rank compression on single-node multi-core machines in an industrial context.. IPDPS 2022 - IEEE International Parallel and Distributed Processing Symposium, 2022, pages 25-35 https://inria.hal.science/hal-03774145/file/article-ipdps2022.pdf
• Agullo, E., Buttari, A., Felšöci, M., Sylvand, G.. Vers un solveur direct à base de tâches pour des systèmes linéaires FEM/BEM creux/denses.. ComPAS 2023 - Conférence francophone d'informatique en Parallélisme, Architecture et Système, Annecy, France, 2023-07
• Lagardère, Andréa, Imbert-Gérard, Lise-Marie, Sylvand, Guillaume, Tordeux, Sébastien. Quasi-Trefftz method for aeroacoustic.. Modeling & Computation Seminar, University of Arizona, Tucson, United States, 2025-02 https://inria.hal.science/hal-05454135/file/seminaire_UoA.pdf
• Lagardère, Andréa, Sylvand, Guillaume, Tordeux, Sébastien, Imbert-Gérard, Lise-Marie. Quasi-Trefftz Method for Solving Aeroacoustic Problem.. SIAM CSE 25, Forth Worth, TX, United States, 2025-03 https://inria.hal.science/hal-05454074/file/siam_texas.pdf
• Peaucelle, Clément, Agullo, Emmanuel, Sylvand, Guillaume. Using Floating Point Compression to increase H-Matrices performance.. COMPAS 2025 - Conférence francophone d'informatique en Parallélisme, Architecture et Système, Bordeaux, France, 2025-06 https://hal.science/hal-05186849/file/peaucelle_compas2025v2.pdf
• Korkmaz, Esragul, Agullo, Emmanuel, Sylvand, Guillaume. High performance solvers for aeroacoustic simulations for Airbus.. COMPAS 2025 - Conférence francophone d'informatique en Parallélisme, Architecture et Système, Bordeaux, France, 2025-06 https://inria.hal.science/hal-05175741/file/abstract.pdf
• Leclerc, Augustin, Benjamin, Pierre, Giraud, Luc, Haddad, Sofiane, Mycek, Paul, Sylvand, Guillaume, Terrasse, Isabelle. Model reduction for a wave propagation problem in a slotted structure.. Waves 2026 - 17th International Conference on Mathematical and Numerical Aspects of Wave Propagation, Montreal, Canada, 2026-06 https://hal.science/hal-05704890/file/Waves_2026.pdf

This list is automatically generated from hal database, it will be less extensive than the lists above, but can contain some helpful links to online documents.