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Accession Number ADA564115
Title Algorithm Development for the Multi-Fluid Plasma Model.
Publication Date May 2011
Media Count 24p
Personal Author U. Shumlak
Abstract An algorithm is developed based on the multi-fluid plasma model derived from moments of the Boltzmann equation. Large mass differences between electrons and ions introduce disparate temporal and spatial scales and require a numerical algorithm with sufficient accuracy to capture the multiple scales. The multi-fluid capability is not limited to two species. Plasma with multiple components can be modeled, e.g. impurity ions, neutral gas. The multi-fluid equations are derived in divergence form for the naturally occurring conserved variables. The source terms of the multi-fluid plasma model couple the fluids to themselves (interspecies interactions) and to the electromagnetic fields. The solution and evolution must be tightly coupled to prevent unstable numerical oscillations. A discontinuous Galerkin method is developed to solve the governing equations on a computational grid and to simulate plasma phenomena. Interspecies interactions also occur through collisional source terms that account for the direct transfer of momentum and energy. In addition to the plasma and electrodynamic physics, the multi-fluid plasma model captures atomic physics in the form reaction rate equations for ionization and recombination, which introduce new temporal scales to the plasma dynamics model.
Keywords Advanced plasma models
Algorithms
Boltzmann equation
Discontinuous galerkin methods
High-order algorithms
Mathematical models
Mathematically stiff equations
Multiscale physics
Plasmas(Physics)
Thermodynamic equilibrium
Thermodynamics


 
Source Agency Non Paid ADAS
NTIS Subject Category 46G - Plasma Physics
Corporate Author Washington Univ., Seattle. Dept. of Aeronautics and Astronautics.
Document Type Technical report
Title Note Final rept. 1 Dec 2008-30 Mar 2011.
NTIS Issue Number 1302
Contract Number FA9550-09-1-0135

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