Approximate Riemann solver for the two-fluid plasma model

Authors:
U. Shumlak;J. Loverich
Affiliations:
University of Washington, Aerospace and Energetics Research Program, Seattle, WA;University of Washington, Aerospace and Energetics Research Program, Seattle, WA
Venue:
Journal of Computational Physics
Year:
2003

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Abstract

An algorithm is presented for the simulation of plasma dynamics using the two-fluid plasma model. The two-fluid plasma model is more general than the magnetohydrodynamic (MHD) model often used for plasma dynamic simulations. The two-fluid equations are derived in divergence form and an approximate Riemann solver is developed to compute the fluxes of the electron and ion fluids at the computational cell interfaces and an upwind characteristic-based solver to compute the electromagnetic fields. The source terms that couple the fluids and fields are treated implicitly to relax the stiffness. The algorithm is validated with the coplanar Riemann problem, Langmuir plasma oscillations, and the electromagnetic shock problem that has been simulated with the MHD plasma model. A numerical dispersion relation is also presented that demonstrates agreement with analytical plasma waves.