Výsledky vyhledávání - "Sever Adrian Hirstoaga"

Reduced model-based parareal simulations of oscillatory singularly perturbed ordinary differential equations

Autor: Laura Grigori, Sever Adrian Hirstoaga, Julien Salomon, Van-Thanh Nguyen

Publikováno v: Journal of Computational Physics
Journal of Computational Physics, Elsevier, 2021, 436, pp.110282
Journal of Computational Physics, 2021, 436, pp.110282

We propose a new strategy for solving by the parareal algorithm highly oscillatory ordinary differential equations which are characteristics of a six-dimensional Vlasov equation. For the coarse solvers we use reduced models, obtained from the two-sca

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0dcfe0ff00547c191c3703057e3cbf3d
https://hal.archives-ouvertes.fr/hal-03104042/file/hal_paper.pdf

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Verification of 2D × 2D and two-species Vlasov-Poisson solvers

Autor: Michel Mehrenberger, Yann Barsamian, Sever Adrian Hirstoaga, Joackim Bernier

Publikováno v: ESAIM: Proceedings and Surveys
ESAIM: Proceedings and Surveys, 2018, 63, pp.78-108. ⟨10.1051/proc/201863078⟩
ESAIM: Proceedings and Surveys, EDP Sciences, 2018, 63, pp.78-108. ⟨10.1051/proc/201863078⟩
ESAIM: Proceedings and Surveys, Vol 63, Pp 78-108 (2018)

In [2], 1D×1D two-species Vlasov-Poisson simulations are performed by the semi-Lagrangian method. Thanks to a classical first order dispersion analysis, we are able to check the validity of their simulations; the extension to second order is perform

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b98ce79a64b59799d81ab98ac37de134
https://hal.science/hal-01668744/document

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Efficient Strict-Binning Particle-in-Cell Algorithm for Multi-core SIMD Processors

Autor: Michel Mehrenberger, Yann Barsamian, Sever Adrian Hirstoaga, Arthur Charguéraud

Publikováno v: Euro-Par 2018: Parallel Processing-24th International Conference on Parallel and Distributed Computing, Turin, Italy, August 27-31, 2018, Proceedings
Euro-Par 2018-24th International European Conference on Parallel and Distributed Computing
Euro-Par 2018-24th International European Conference on Parallel and Distributed Computing, Aug 2018, Turin, Italy. ⟨10.1007/978-3-319-96983-1_53⟩
Euro-Par 2018: Parallel Processing ISBN: 9783319969824
Euro-Par
Lecture Notes in Computer Science
Lecture Notes in Computer Science-Euro-Par 2018: Parallel Processing

International audience; Particle-in-Cell (PIC) codes are widely used for plasma simulations. On recent multi-core hardware, performance of these codes is often limited by memory bandwidth. We describe a multi-core PIC algorithm that achieves close-to

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Multiscale Particle-in-Cell methods and comparisons for the long-time two-dimensional Vlasov-Poisson equation with strong magnetic field

Autor: Sever Adrian Hirstoaga, Xiaofei Zhao, Nicolas Crouseilles

Publikováno v: Computer Physics Communications
Computer Physics Communications, 2018, 222, pp.136-151. ⟨10.1016/j.cpc.2017.09.027⟩
Computer Physics Communications, Elsevier, 2018, 222, pp.136-151. 〈10.1016/j.cpc.2017.09.027〉
Computer Physics Communications, Elsevier, 2018, 222, pp.136-151. ⟨10.1016/j.cpc.2017.09.027⟩

International audience; We applied different kinds of multiscale methods to numerically study the long-time Vlasov-Poisson equation with a strong magnetic field. The multiscale methods include an asymptotic preserving Runge-Kutta scheme, an exponenti

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5eba4c360f420cbfc1daffdc36a7f4f5
https://hal.science/hal-01496854/file/VPComparisonSever.pdf

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Efficient Data Layouts for a Three-Dimensional Electrostatic Particle-in-Cell Code

Autor: Yann Barsamian, Sever Adrian Hirstoaga, Eric Violard

Publikováno v: Journal of computational science
Journal of computational science, 2018, 27, pp.345--356. ⟨10.1016/j.jocs.2018.06.004⟩
Journal of computational science, Elsevier, 2018, 27, pp.345--356. ⟨10.1016/j.jocs.2018.06.004⟩

The Particle-in-Cell (PIC) method is a widely used tool in plasma physics. To accurately solve realistic problems, the method requires to use trillions of particles and therefore, there is a strong demand for high performance code on modern architect

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::35d2b8a7463889d0f890d096d6000c58
https://hal.science/hal-01664207

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Efficient Data Structures for a Hybrid Parallel and Vectorized Particle-in-Cell Code

Autor: Eric Violard, Yann Barsamian, Sever Adrian Hirstoaga

Publikováno v: IPDPS Workshops
IPDPSW 2017-IEEE International Parallel and Distributed Processing Symposium Workshops
IPDPSW 2017-IEEE International Parallel and Distributed Processing Symposium Workshops, May 2017, Lake Buena Vista, FL, United States. pp.1168-1177, ⟨10.1109/IPDPSW.2017.74⟩

International audience; The contribution of the present work relies on an innovative and judicious combination of several optimization techniques for achieving high performance when using automatic vectorization and hybrid MPI/OpenMP parallelism in a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::eb045bdbe035cc991b62cb040e8ac5f5
https://doi.org/10.1109/ipdpsw.2017.74

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Effect of collisional temperature isotropisation on ELM parallel transport in a tokamak scrape-off layer

Autor: Sever Adrian Hirstoaga, David Coulette, Giovanni Manfredi

Publikováno v: Plasma Physics and Controlled Fusion
Plasma Physics and Controlled Fusion, IOP Publishing, 2016, 58 (8), pp.085004
Plasma Physics and Controlled Fusion, 2016, 58 (8), pp.085004. ⟨10.1088/0741-3335/58/8/085004⟩
Plasma Physics and Controlled Fusion, IOP Publishing, 2016, 58 (8), pp.085004. ⟨10.1088/0741-3335/58/8/085004⟩

International audience; We develop a hybrid model to describe the parallel transport in a tokamak scrape-off layer following an edge-localized mode (ELM) event. The parallel dynamics is treated with a kinetic Vlasov–Poisson model, while the evoluti

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::57929cfa0178c1485f47009e63b9e4b0
https://hal.inria.fr/hal-01399230/file/elm_hybrid_revis.pdf

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Optimization of Particle-In-Cell simulations for Vlasov-Poisson system with strong magnetic field

Autor: Mathieu Lutz, Sever Adrian Hirstoaga, Edwin Chacon-Golcher

Publikováno v: ESAIM: Proceedings and Surveys
ESAIM: Proceedings and Surveys, 2016, CEMRACS 2014-Numerical Modeling of Plasmas, 53, pp.177-190. ⟨10.1051/proc/201653011⟩
ESAIM: Proceedings and Surveys, Vol 53, Pp 177-190 (2016)
ESAIM: Proceedings and Surveys, EDP Sciences, 2016, CEMRACS 2014-Numerical Modeling of Plasmas, 53, pp.177-190. ⟨10.1051/proc/201653011⟩

We study the dynamics of charged particles under the influence of a strong magnetic field by numerically solving the Vlasov-Poisson and guiding center models. By using appropriate data structures, we implement an efficient (from the memory access poi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0cd768ede0b8a47f7846d7aada7e4703
https://hal.science/hal-01231444v2/document

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An exponential integrator for a highly oscillatory Vlasov equation

Autor: Emmanuel Frénod, Eric Sonnendrücker, Sever Adrian Hirstoaga

Publikováno v: Discrete and Continuous Dynamical Systems-Series S
Discrete and Continuous Dynamical Systems-Series S, American Institute of Mathematical Sciences, 2015, 8 (1), pp.169-183. ⟨10.3934/dcdss.2015.8.169⟩
Discrete & Continuous Dynamical Systems-S
Discrete and Continuous Dynamical Systems-Series S, 2015, 8 (1), pp.169-183. ⟨10.3934/dcdss.2015.8.169⟩
Discrete and Continuous Dynamical Systems. Series S

International audience; In the framework of a Particle-In-Cell scheme for some 1D Vlasov-Poisson system depending on a small parameter, we propose a time-stepping method which is numerically uniformly accurate when the parameter goes to zero. Based o

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::452176c17b318feff0470dfcc7a7a87d
https://hal.inria.fr/hal-00833479/document

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Long Time Behaviour of an Exponential Integrator for a Vlasov-Poisson System with Strong Magnetic Field

Autor: Emmanuel Frénod, Sever Adrian Hirstoaga, Mathieu Lutz, Eric Sonnendrücker

Publikováno v: Communications in Computational Physics
Communications in Computational Physics, 2015, 18 (2), pp.263--296. ⟨10.4208/cicp.070214.160115a⟩
Communications in Computational Physics, Global Science Press, 2015, 18 (2), pp.263--296. ⟨10.4208/cicp.070214.160115a⟩

With the aim of solving in a four dimensional phase space a multi-scale Vlasov-Poisson system, we propose in a Particle-In-Cell framework a robust time-stepping method that works uniformly when the small parameter vanishes. As an exponential integrat

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