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The 5moment twofluid plasma model uses Euler equations to describe the ion and electron fluids, and Maxwell's equations to describe the electric and magnetic fields. Twofluid physics becomes significant when the characteristic spatial scales are on the order of the ion skin depth and characteristic time scales are on the order of the inverse ion cyclotron frequency. The twofluid plasma model has disparate characteristic speeds ranging from the ion and electron speeds of sound to the speed of light. Explicit and implicit timestepping schemes are explored for the twofluid plasma model to study the accuracy and computational effectiveness with which they could capture twofluid physics. The explicit schemes explored include the high resolution wave propagation method (a finite volume method) and the RungeKutta discontinuous Galerkin method (a finite element method). The twofluid plasma model is compared to the more commonly used HallMHD model for accuracy and computational effort using an explicit timestepping scheme. Simulations of twofluid instabilities in the Zpinch and the fieldreversed configuration are presented in 3dimensions.
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