Self-consistent treatment of the sheath boundary conditions by introducing anisotropic ion temperatures and virtual divertor model

Satoshi Togo, Tomonori Takizuka, Makoto Nakamura, Kazuo Hoshino, Kenzo Ibano, Tee Long Lang, Yuichi Ogawa

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

One-dimensional SOL-divertor plasma fluid simulation code which considers anisotropy of ion temperature has been developed so as to deal with sheath theory self-consistently. In our fluid modeling, explicit use of boundary condition for Mach number M at divertor plate, e.g., M=1, becomes unnecessary. In order to deal with the Bohm condition and the sheath heat transmission factors at divertor plate self-consistently, we introduced a virtual divertor (VD) model which sets an artificial region beyond divertor plates and artificial sinks for particle, momentum and energy there to model the effects of the sheath region in front of the divertor plate. Validity of our fluid model with VD model is confirmed by showing that simulation results agree well with those from a kinetic code regarding the Bohm condition, ion temperature anisotropy and supersonic flow. We also show that the strength of artificial sinks in VD region does not affect profiles in plasma region at least in the steady state and that sheath heat transmission factors can be adjusted to theoretical values by VD model. Validity of viscous flux is also investigated.

Original languageEnglish
Pages (from-to)109-126
Number of pages18
JournalJournal of Computational Physics
Volume310
DOIs
Publication statusPublished - 2016 Apr 1
Externally publishedYes

Fingerprint

ion temperature
sheaths
Boundary conditions
boundary conditions
Ions
Fluids
Anisotropy
Temperature
Plasmas
Supersonic flow
sinks
heat transmission
fluids
Mach number
Momentum
Fluxes
anisotropy
supersonic flow
Kinetics
simulation

Keywords

  • Anisotropic ion temperature
  • Fluid modeling
  • Sheath boundary condition
  • SOL-divertor plasma
  • Virtual divertor model

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Computer Science Applications

Cite this

Self-consistent treatment of the sheath boundary conditions by introducing anisotropic ion temperatures and virtual divertor model. / Togo, Satoshi; Takizuka, Tomonori; Nakamura, Makoto; Hoshino, Kazuo; Ibano, Kenzo; Lang, Tee Long; Ogawa, Yuichi.

In: Journal of Computational Physics, Vol. 310, 01.04.2016, p. 109-126.

Research output: Contribution to journalArticle

Togo, Satoshi ; Takizuka, Tomonori ; Nakamura, Makoto ; Hoshino, Kazuo ; Ibano, Kenzo ; Lang, Tee Long ; Ogawa, Yuichi. / Self-consistent treatment of the sheath boundary conditions by introducing anisotropic ion temperatures and virtual divertor model. In: Journal of Computational Physics. 2016 ; Vol. 310. pp. 109-126.
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AU - Takizuka, Tomonori

AU - Nakamura, Makoto

AU - Hoshino, Kazuo

AU - Ibano, Kenzo

AU - Lang, Tee Long

AU - Ogawa, Yuichi

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