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Title: Complexity reduction of collisional-radiative kinetics for atomic plasma

Thermal non-equilibrium processes in partially ionized plasmas can be most accurately modeled by collisional-radiative kinetics. This level of detail is required for an accurate prediction of the plasma. However, the resultant system of equations can be prohibitively large, making multi-dimensional and unsteady simulations of non-equilibrium radiating plasma particularly challenging. In this paper, we present a scheme for model reduction of the collisional-radiative kinetics, by combining energy levels into groups and deriving the corresponding macroscopic rates for all transitions. Although level-grouping is a standard approach to this type of problem, we provide here a mechanism for achieving higher-order accuracy by accounting for the level distribution within a group. The accuracy and benefits of the scheme are demonstrated for the generic case of atomic hydrogen by comparison with the complete solution of the master rate equations and other methods.
Authors:
 [1] ;  [2] ;  [3]
  1. ERC Inc., Edwards AFB, California 93524 (United States)
  2. Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, California 90095 (United States)
  3. Air Force Research Laboratory, Edwards AFB, California 93524 (United States)
Publication Date:
OSTI Identifier:
22218376
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 12; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 74 ATOMIC AND MOLECULAR PHYSICS; ATOMS; COMPARATIVE EVALUATIONS; ELECTRON-ION COLLISIONS; ENERGY LEVELS; ENERGY-LEVEL TRANSITIONS; HYDROGEN; MATHEMATICAL SOLUTIONS; PLASMA; PLASMA SIMULATION; RADIANT HEAT TRANSFER; REACTION KINETICS; THERMODYNAMICS