A general nonlinear fluid model for reacting plasma-neutral mixtures

Meier, Eric; Shumlak, U.

doi:10.1063/1.4736975

Cited by 101 publications

(123 citation statements)

References 22 publications

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“…Both kinetic neutral models such as [9][10][11][12] , and fluid models [13][14][15][16] have previously been applied to study SOL and edge plasmas in the presence of neutrals. In this paper we derive a 2 neutral fluid model for the purpose of studying the effects of neutrals on the intermittent plasma fields.…”

Section: Introductionmentioning

confidence: 99%

Plasma particle sources due to interactions with neutrals in a turbulent scrape-off layer of a toroidally confined plasma

et al. 2018

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The conditions in the edge and scrape-off layer (SOL) of magnetically confined plasmas determine the overall performance of the device, and it is of great importance to study and understand the mechanics that drive transport in those regions. If a significant amount of neutral molecules and atoms is present in the edge and SOL regions, those will influence the plasma parameters and thus the plasma confinement. In this paper, it is displayed how neutrals, described by a fluid model, introduce source terms in a plasma drift-fluid model due to inelastic collisions. The resulting source terms are included in a four-field drift-fluid model, and it is shown how an increasing neutral particle density in the edge and SOL regions influences the plasma particle transport across the last-closed-flux-surface. It is found that an appropriate gas puffing rate allows for the edge density in the simulation to be self-consistently maintained due to ionization of neutrals in the confined region.

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Section: Introductionmentioning

confidence: 99%

Plasma particle sources due to interactions with neutrals in a turbulent scrape-off layer of a toroidally confined plasma

et al. 2018

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“…Braginskii's work has been successively refined by several authors, with particular emphases on improving the transport coefficients and/or including interaction with neutral species [24][25][26][27] . Burgers, on the other hand, presents a rather general framework for the modeling of elastic collisions 28 .…”

Section: Introductionmentioning

confidence: 99%

Modeling of inelastic collisions in a multifluid plasma: Excitation and deexcitation

Cambier

2015

Physics of Plasmas

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We describe here a model for inelastic collisions for electronic excitation and deexcitation processes in a general, multifluid plasma. The model is derived from kinetic theory, and applicable to any mixture and mass ratio. The principle of detailed balance is strictly enforced, and the model is consistent with all asymptotic limits. The results are verified with direct Monte Carlo calculations, and various numerical tests are conducted for the case of an electron-hydrogen two-fluid system, using a generic, semi-classical model of collision cross sections. We find that in some cases, the contribution of inelastic collisions to the momentum and thermal resistance coefficients is not negligible, in contrast to the assumptions of current multifluid models. This fundamental model is also applied to ionization and recombination processes, the studies on which are currently underway.

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“…For the purely electron-hydrogen plasma,which is considered here with no heavy ions, the effect of the charge exchange is reduced to regular elastic collisions (Vranjes & Krstic 2013) and therefore it is not taken into account separately, as done for example in Meier & Shumlak (2012). The momentum transfer due to inelastic collisions is discussed in more details in the next subsection.…”

Section: Model Equationsmentioning

confidence: 99%

Multi-fluid Modeling of Magnetosonic Wave Propagation in the Solar Chromosphere: Effects of Impact Ionization and Radiative Recombination

Maneva

Laguna

Lani

et al. 2017

ApJ

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In order to study chromospheric magnetosonic wave propagation including, for the first time, the effects of ionneutral interactions in the partially ionized solar chromosphere, we have developed a new multi-fluid computational modelaccounting for ionization and recombination reactions in gravitationally stratified magnetized collisional media. The two-fluid model used in our 2D numerical simulations treats neutrals as a separate fluid and considers charged species (electrons and ions) within the resistive MHD approach with Coulomb collisions and anisotropic heat flux determined by Braginskiis transport coefficients. The electromagnetic fields are evolved according to the full Maxwell equations and the solenoidality of the magnetic field is enforced with a hyperbolic divergence-cleaning scheme. The initial density and temperature profiles are similar to VAL III chromospheric model in which dynamical, thermal, and chemical equilibrium are considered to ensure comparison to existing MHD models and avoid artificial numerical heating. In this initial setup we include simple homogeneous flux tube magnetic field configuration and an external photospheric velocity driver to simulate the propagation of MHD waves in the partially ionized reactive chromosphere. In particular, we investigate the loss of chemical equilibrium and the plasma heating related to the steepening of fast magnetosonic wave fronts in the gravitationally stratified medium.

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A general nonlinear fluid model for reacting plasma-neutral mixtures

Cited by 101 publications

References 22 publications

Plasma particle sources due to interactions with neutrals in a turbulent scrape-off layer of a toroidally confined plasma

Plasma particle sources due to interactions with neutrals in a turbulent scrape-off layer of a toroidally confined plasma

Modeling of inelastic collisions in a multifluid plasma: Excitation and deexcitation

Multi-fluid Modeling of Magnetosonic Wave Propagation in the Solar Chromosphere: Effects of Impact Ionization and Radiative Recombination

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