Ambipolar diffusion and drift in computational weakly-ionized plasmadynamics

Bernard Parent, Sergey O. Macheret, Mikhail N. Shneider

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Modeling of ambipolar diffusion and drift taking place within a weakly-ionized fluid can lead to some convergence difficulties when the ion conservation equation and the electric field potential equation are solved consecutively. A novel formulation of the ion flow rate is proposed here that reduces the computing effort to reach convergence by a factor of 10 or more. It is shown that by recasting the ion flow rate in terms of drift and ambipolar diffusion components, the sensitivity to the electric field is reduced hence alleviating the stiffness of the system of equations and permitting significantly faster convergence. What makes the method particularly appealing is that (i) it yields faster convergence without affecting the accuracy of the converged solution and (ii) it is not restricted to specific discretization or relaxation schemes and can hence be readily implemented in existing flow solvers. Because it is developed in general form (i.e. applicable to a multicomponent plasma in the simultaneous presence of electric current and magnetic and electric fields), the method is notably well-suited to simulate ambipolar diffusion within ionized multi-species flow solvers and is recommended for all flowfields as long as the plasma remains weakly-ionized and quasi-neutral.

Original languageEnglish (US)
Pages (from-to)8010-8027
Number of pages18
JournalJournal of Computational Physics
Volume230
Issue number22
DOIs
StatePublished - Sep 10 2011
Externally publishedYes

Keywords

  • Ambipolar diffusion
  • Ambipolar drift
  • Computational Fluid Dynamics (CFD)
  • Convergence acceleration
  • Magnetohydrodynamics (MHD)
  • Multicomponent plasma
  • Quasi-neutral plasma
  • Weakly-ionized plasma

ASJC Scopus subject areas

  • Numerical Analysis
  • Modeling and Simulation
  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)
  • Computer Science Applications
  • Computational Mathematics
  • Applied Mathematics

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