The Effect of Artificial Diffusivity on the Flute Instability

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Sometimes, in order to improve the performance of magneto-hydrodynamical codes, artificial diffusivity (D) is introduced in the mass continuity equation. In this communication, an analysis of the effect of the artificial diffusivity on the low-beta plasma stability in a simple geometry is presented. It is shown that, at low diffusivity, one recovers classical results, whereas at high diffusivity the plasma becomes more unstable. Dependence of the stability on D is suppressed if the volume of flux-tube varies insignificantly in the course of the perturbation growth. These observations may help the code runners to identify regimes where the artificial diffusivity is ... continued below

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Ryutov, D D; Cohen, B I; Cohen, R H; Hooper, E B & Sovinec, C R May 3, 2005.

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Description

Sometimes, in order to improve the performance of magneto-hydrodynamical codes, artificial diffusivity (D) is introduced in the mass continuity equation. In this communication, an analysis of the effect of the artificial diffusivity on the low-beta plasma stability in a simple geometry is presented. It is shown that, at low diffusivity, one recovers classical results, whereas at high diffusivity the plasma becomes more unstable. Dependence of the stability on D is suppressed if the volume of flux-tube varies insignificantly in the course of the perturbation growth. These observations may help the code runners to identify regimes where the artificial diffusivity is not affecting the results (or vise versa).

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PDF-file: 16 pages; size: 98.9 Kbytes

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  • Journal Name: Physics of Plasmas; Journal Volume: 12; Journal Issue: 8

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  • Report No.: UCRL-JRNL-212005
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 878202
  • Archival Resource Key: ark:/67531/metadc879001

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  • May 3, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Nov. 23, 2016, 5:16 p.m.

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Ryutov, D D; Cohen, B I; Cohen, R H; Hooper, E B & Sovinec, C R. The Effect of Artificial Diffusivity on the Flute Instability, article, May 3, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc879001/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.