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Dataset from: Improved multispecies Dougherty collisions - MaRDI portal

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Dataset from: Improved multispecies Dougherty collisions

From MaRDI portal



DOI10.5281/zenodo.6350748Zenodo6350748MaRDI QIDQ6694297

Dataset published at Zenodo repository.

Author name not available (Why is that?)

Publication date: 13 March 2022

Copyright license: No records found.



Description

The Dougherty model Fokker-Planck operator is extended to describe nonlinear full-fcollisions 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 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.






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