Negative streamer fronts : comparison of particle and fluid models and hybrid coupling in space

C. Li, W.J.M. Brok, U.M. Ebert, W. Hundsdorfer, J.J.A.M. Mullen, van der

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Abstract

To understand ionization fronts and the growth of streamer channels, both fluid and particle models have been developed. While fluid models are computationally efficient in regions with large particle densities like the interior of a streamer finger, particle models represent the full microscopic scattering physics and are appropriate for regions with low densities and for particles with high energies like in the "pulled" ionization front ahead of the streamer finger. Furthermore, the statistics of few single particles in the front can create fluctuations of velocity and ionization rate and might trigger inherent instabilities. The goal of the project is therefore to develop a computation scheme that is hybrid in space. Here, we compare planar ionization fronts in the fluid or the particle model. The ionization density behind the particle front is higher while front velocities are similar. We analyze and explain this discrepancy. We also sketch the concept of hybrid model coupling of different spatial regions.
Original languageEnglish
Title of host publicationXXVIII International Conference on Phenomena in Ionised Gases (ICPIG 2007) 15-20 July 2007, Prague, Czech Republic. Proceedings
EditorsJ. Schmidt, M. Simek, S. Pekarek, V. Prukner
Place of PublicationBristol, United Kingdom
PublisherInstitute of Physics
Pages464-467
ISBN (Print)978-80-87026-01-4
Publication statusPublished - 2007
Event28th International Conference on Phenomena in Ionized Gases (ICPIG 2007), July 15-20, 2007, Prague, Czech Republic - Prague, Czech Republic
Duration: 15 Jul 200720 Jul 2007

Conference

Conference28th International Conference on Phenomena in Ionized Gases (ICPIG 2007), July 15-20, 2007, Prague, Czech Republic
Abbreviated titleICPIG 2007
Country/TerritoryCzech Republic
CityPrague
Period15/07/0720/07/07

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