Cristin-resultat-ID: 1693580
Sist endret: 24. mars 2020, 15:02
NVI-rapporteringsår: 2019
Resultat
Vitenskapelig artikkel
2019

Adaptive multiscale methods for 3D streamer discharges in air

Bidragsytere:
  • Robert Marskar

Tidsskrift

Plasma Research Express
ISSN 2516-1067
e-ISSN 2516-1067
NVI-nivå 1

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2019
Publisert online: 2019
Volum: 1
Hefte: 1
Artikkelnummer: 015011
Open Access

Importkilder

Scopus-ID: 2-s2.0-85070472321

Beskrivelse Beskrivelse

Tittel

Adaptive multiscale methods for 3D streamer discharges in air

Sammendrag

We discuss spatially and temporally adaptive implicit-explicit (IMEX) methods for parallel simulations of three-dimensional fluid streamer discharges in atmospheric air. We examine strategies for advancing the fluid equations and elliptic transport equations (e.g. Poisson) with different time steps, synchronizing them on a global physical time scale which is taken to be proportional to the dielectric relaxation time. The use of a longer time step for the electric field leads to numerical errors that can be diagnosed, and we quantify the conditions where this simplification is valid. Likewise, using a three-term Helmholtz model for radiative transport, the same error diagnostics show that the radiative transport equations do not need to be resolved on time scales finer than the dielectric relaxation time. Elliptic equations are bottlenecks for most streamer simulation codes, and the results presented here potentially provide computational savings. Finally, a computational example of 3D branching streamers in a needle-plane geometry that uses up to 700 million grid cells is presented. © 2019 IOP Publishing Ltd.

Bidragsytere

Robert Marskar

  • Tilknyttet:
    Forfatter
    ved Elkraftteknologi ved SINTEF Energi AS
1 - 1 av 1