The Effect of Artificial Diffusivity on the Flute Instability
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).
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 878202
- Report Number(s):
- UCRL-JRNL-212005; PHPAEN; TRN: US0602287
- Journal Information:
- Physics of Plasmas, Vol. 12, Issue 8; ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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