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- W2330904651 abstract "A multi-species magnetohydrodynamic (MHD) model based on an extended fluid dynamics description for each plasma species is proposed for the prediction of the flow and behavior of fully ionized non-equilibrium anisotropic plasmas. In particular, a two-fluid (ions and electrons) plasma model is described that makes use of a 10-moment or Gaussian anisotropic moment closure to model ion and electron species transport. The ion and electron moment equations are fully coupled to the complete set of Maxwell’s equations which govern electromagnetic wave propagation within the plasma and a relaxation time approximation is used to model non-equilibrium Coulomb collisional processes between the ions and electrons. Unlike conventional MHD models, the proposed two-fluid model is capable of taking into account large temperature anisotropies and temperature differences between the electrons and ions, both of which can occur for low-density, high-temperature plasmas and/or strongly magnetized plasmas. A dispersion analysis of the proposed model is undertaken in order to examine further its mathematical properties and explore the nature of its solutions. The dispersive and hyperbolic nature of the equations and the disparate times scales or plasma frequencies of the solutions are revealed. The governing system of partial differential equations would appear to be well suited for solution by Godunov-type finite-volume methods provided that the disparate scales can be dealt with. A higherorder finite-volume method is developed here for the solution of the one-dimensional form of the two-fluid plasma model and dispersion analyses of the discretized equations indicates that a stable and practical scheme is possible if a fully implicit time marching scheme is adopted. The analysis also suggests mechanisms for preconditioning the system of equations to further reduce numerical stiffness, resulting in a plasma model that is more suitable for practical applications. Numerical results for several one-dimensional unsteady plasma flows are described and demonstrate the potential of the proposed multi-species plasma model for predicting non-equilibrium anisotropic plasma flows in engineering applications such as those encountered in electric space propulsion devices. The future extension of the model to partially ionized plasmas in two and three space dimensions is also discussed." @default.
- W2330904651 created "2016-06-24" @default.
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- W2330904651 date "2007-06-15" @default.
- W2330904651 modified "2023-09-23" @default.
- W2330904651 title "Development of Two-Fluid Magnetohydrodynamics Model for Non-Equilibrium Anisotropic Plasma Flows" @default.
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- W2330904651 doi "https://doi.org/10.2514/6.2007-4373" @default.
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