Modeling and Simulating Flowing Plasmas and Related Phenomena

S. A. Ledvina, Y.-J. Ma, E. Kallio
2008 Space Science Reviews  
Simulation has become a valuable tool that compliments more traditional methods used to understand solar system plasmas and their interactions with planets, moons and comets. The three popular simulation approaches to studying these interactions are presented. Each approach provides valuable insight to these interactions. To date no one approach is capable of simulating the whole interaction region from the collisionless to the collisional regimes. All three approaches are therefore needed.
more » ... approach has several implicit physical assumptions as well as several numerical assumptions depending on the scheme used. The magnetohydrodynamic (MHD), test-particle/Monte-Carlo and hybrid models used in simulating flowing plasmas are described. Special consideration is given to the implicit assumptions underlying each model. Some of the more common numerical methods used to implement each model, the implications of these numerical methods and the resulting limitations of each simulation approach are also discussed. The interplay between the ion motions and the fields leads to many non-linear processes such as instabilities and waves that are at the core plasma physics. Solving (1.1)-(1.2) together with Maxwell's equations (1.3)-(1.6) for every electron and ion in a plasma is an intractable task. Since it is the collective behavior or macroscopic properties that one is after many assumptions and simplifications can be made. The choice of assumptions and simplifications will lead to the approach used to model the plasma. The hybrid and MHD equations are presented but not derived here. The interested reader can find them derived in a variety of plasma physics text (cf.
doi:10.1007/s11214-008-9384-6 fatcat:yttni2uyerbqpmiegsdyuibt3a