Answers are grounded in this paper and cite their sources.
Computational modeling study demonstrates an entropy-satisfying multispecies Dougherty collision operator across arbitrary plasma mass ratios, suggesting robust kinetic and gyrokinetic simulations.
The Dougherty model Fokker–Planck operator is extended to describe nonlinear full- f ( f is the distribution function) collisions between multiple species in plasmas. Simple relations for cross-species primitive moments are developed which obey conservation laws, and reproduce familiar velocity and temperature relaxation rates. This treatment of multispecies Dougherty collisions, valid for arbitrary mass ratios, avoids unphysical temperatures and satisfies the H -theorem (H is related to the entropy) unlike an analogous Bhatnagar–Gross–Krook operator. Formulas for both a Cartesian velocity space and a gyroaveraged operator are provided for use in Vlasov as well as long-wavelength gyrokinetic models. We present an algorithm for the discontinuous Galerkin discretization of this operator, and provide results from relaxation and Landau damping benchmarks.
No takes yet. Share an insight, caveat, or question.
Francisquez et al. (2022) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: