Extended fluid models: Pressure tensor effects and equilibria
Abstract
We consider the use of "extended fluid models" as a viable alternative to computationally demanding kinetic simulations in order to manage the global large scale evolution of a collisionless plasma while accounting for the main effects that come into play when spatial microscales of the order of the ion inertial scale d_{i} and of the thermal ion Larmor radius ϱ_{i} are formed. We present an extended twofluid model that retains finite Larmor radius (FLR) corrections to the ion pressure tensor while electron inertia terms and heat fluxes are neglected. Within this model we calculate analytic FLR plasma equilibria in the presence of a shear flow and elucidate the role of the magnetic field asymmetry. Using a Hybrid Vlasov code, we show that these analytic equilibria offer a significant improvement with respect to conventional magnetohydrodynamic shearflow equilibria when initializing kinetic simulations.
 Publication:

Physics of Plasmas
 Pub Date:
 November 2013
 DOI:
 10.1063/1.4828981
 Bibcode:
 2013PhPl...20k2112C
 Keywords:

 plasma kinetic theory;
 plasma magnetohydrodynamics;
 plasma pressure;
 plasma simulation;
 shear flow;
 Vlasov equation;
 52.30.Ex;
 52.65.Ff;
 52.25.Dg;
 52.65.Kj;
 52.65.Ww;
 52.30.Cv;
 Twofluid and multifluid plasmas;
 FokkerPlanck and Vlasov equation;
 Plasma kinetic equations;
 Magnetohydrodynamic and fluid equation;
 Hybrid methods;
 Magnetohydrodynamics