Zobrazeno 1 - 10
of 20
pro vyhledávání: '"Maurizio Ottaviani"'
Publikováno v:
Physics Letters A. 410:127522
We study the Kolmogorov model of a shear flow by means of a newly developed Asymptotic-Preserving method for the numerical resolution of the two-dimensional vorticity-Poisson (Navier-Stokes) system. The scheme is validated by comparing the results wi
Publikováno v:
Journal of Scientific Computing
Journal of Scientific Computing, 2018, 74 (3), pp.1601-1650. ⟨10.1007/s10915-017-0509-5⟩
Journal of Scientific Computing, Springer Verlag, 2018, 74 (3), pp.1601-1650. ⟨10.1007/s10915-017-0509-5⟩
Journal of Scientific Computing, 2018, 74 (3), pp.1601-1650. ⟨10.1007/s10915-017-0509-5⟩
Journal of Scientific Computing, Springer Verlag, 2018, 74 (3), pp.1601-1650. ⟨10.1007/s10915-017-0509-5⟩
International audience; This work is devoted to the study of field-aligned interpolation in semi-Lagrangian codes. 1 In the context of numerical simulations of magnetic fusion devices, this approach is motivated by the observation that gradients of t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3b5c88c8d1e4ba8187795c0a7f455801
https://hal.science/hal-01315889v3/file/fcisl.pdf
https://hal.science/hal-01315889v3/file/fcisl.pdf
Publikováno v:
Computer Physics Communications
Computer Physics Communications, 2017, 219, pp.164-177
Computer Physics Communications, Elsevier, 2017, 219, pp.164-177
Computer Physics Communications, 2017, 219, pp.164-177
Computer Physics Communications, Elsevier, 2017, 219, pp.164-177
We present a numerical scheme for the ion Euler equations with Braginskii closure, in the quasi-neutral regime with an adiabatic electron response. The scheme is constructed with the aid of asymptotic-preserving (AP) techniques in order to avoid the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ee38dc0c8ee48b6e9c4894145eeb70e0
https://hal.science/hal-01979763
https://hal.science/hal-01979763
Autor:
Daniele Del Sarto, Maurizio Ottaviani
Publikováno v:
Physics of Plasmas
Physics of Plasmas, American Institute of Physics, 2017, 24, pp.12102-12102. ⟨10.1063/1.4973328⟩
Physics of Plasmas, 2017, 24, pp.12102-12102. ⟨10.1063/1.4973328⟩
Physics of Plasmas, American Institute of Physics, 2017, 24, pp.12102-12102. ⟨10.1063/1.4973328⟩
Physics of Plasmas, 2017, 24, pp.12102-12102. ⟨10.1063/1.4973328⟩
In this work we consider magnetic reconnection in thin current sheets with both resistive and electron inertia effects. When the current sheet is produced by a primary instability of the internal kink type, the analysis of secondary instabilities ind
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e3fe8e0ce841ac83448d92e2fd0be430
https://hal.archives-ouvertes.fr/hal-01780899/document
https://hal.archives-ouvertes.fr/hal-01780899/document
Publikováno v:
Journal of Computational Physics
Journal of Computational Physics, Elsevier, 2015, 280, pp.602-625
Journal of Computational Physics, 2015, 280, pp.602-625
Journal of Computational Physics, Elsevier, 2015, 280, pp.602-625
Journal of Computational Physics, 2015, 280, pp.602-625
In this work, a new numerical scheme for the reduced resistive MHD system (RMHD) is presented. Numerical simulations of RMHD are notoriously challenging because of the disparate time-scales, encompassing the Alfven wave period and the resistive diffu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5db206dc9d36b88b48af8283cab4bf30
https://hal.archives-ouvertes.fr/hal-01979747
https://hal.archives-ouvertes.fr/hal-01979747
Autor:
Maurizio Ottaviani, John A. Krommes
Publikováno v:
Physics of Plasmas. 6:3731-3734
Numerical measurements and analytical studies are performed on a stochastic model with features relevant to plasma confinement. Although the model lacks crucial features of self-organized criticality (SOC) and its transport can be computed by standar
Autor:
Jacek Narski, Maurizio Ottaviani
Publikováno v:
Computer Physics Communications
Computer Physics Communications, Elsevier, 2014, 185 (12), pp.3189-3203. ⟨10.1016/j.cpc.2014.08.018⟩
Computer Physics Communications, 2014, 185 (12), pp.3189-3203. ⟨10.1016/j.cpc.2014.08.018⟩
Computer Physics Communications, Elsevier, 2014, 185 (12), pp.3189-3203. ⟨10.1016/j.cpc.2014.08.018⟩
Computer Physics Communications, 2014, 185 (12), pp.3189-3203. ⟨10.1016/j.cpc.2014.08.018⟩
This paper deals with the numerical study of a strongly anisotropic heat equation. The use of standard schemes in this situation leads to poor results, due to the high anisotropy. Furthermore, the recently proposed Asymptotic-Preserving method [arXiv
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::eb03530e2c0564abe65f8dfa97813dfe
http://arxiv.org/abs/1303.5219
http://arxiv.org/abs/1303.5219
Publikováno v:
Physics of Fluids B: Plasma Physics. 5:3558-3589
A type of eddy‐damped quasinormal Markovian (EDQNM) closure is shown to be potentially nonrealizable in the presence of linear wave phenomena. This statistical closure results from the application of a fluctuation–dissipation (FD) ansatz to the d
Autor:
John A. Krommes, Maurizio Ottaviani
Publikováno v:
Physical Review Letters. 69:2923-2926
A Kolmogorov-type analysis of the energy- and enstrophy-cascading ranges of a forced Hasegawa-Mima equation allows one to derive a criterion for the threshold of the transition between the weak-turbulence and the strong-turbulence regimes. Contrary t
Publikováno v:
Physics of Fluids B: Plasma Physics. 3:2186-2191
Explaining anomalous plasma transport in magnetic confinement devices requires a deeper understanding of the underlying turbulent processes than presently exists. In this work, Markovian closures are built by imposing the constraints of realizability