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Continuum gyrokinetic simulations of edge plasmas in single-null geometries

Dorf, M. ; Dorr, M.

Physics of plasmas, 2021-03, Vol.28 (3) [Periódico revisado por pares]

Melville: American Institute of Physics

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  • Título:
    Continuum gyrokinetic simulations of edge plasmas in single-null geometries
  • Autor: Dorf, M. ; Dorr, M.
  • Assuntos: Algorithms ; Boundaries ; Computational fluid dynamics ; Coordinates ; Electric fields ; Fluid flow ; Interpolation ; Mathematical analysis ; Numerical analysis ; Plasmas ; Simulation ; Turbulence
  • É parte de: Physics of plasmas, 2021-03, Vol.28 (3)
  • Notas: AC52-07NA27344
    USDOE
  • Descrição: The first continuum gyrokinetic calculations of electrostatic ion scale turbulence are presented for the case of a diverted tokamak geometry. The simulation model solves the long-wavelength limit of the full-F gyrokinetic equation for ion species coupled to the quasi-neutrality equation for electrostatic potential variations, where a fluid model is used for an electron response. In order to facilitate simulations of highly-anisotropic microturbulence in the presence of strong magnetic shear and a magnetic X-point, a numerical algorithm utilizing a locally field-aligned multiblock coordinate system has been developed and implemented in the 5D finite-volume code COGENT. In this approach, the toroidal direction is divided into blocks, such that within each block, the cells are field-aligned and a non-matching grid interface is allowed at block boundaries. The toroidal angle corresponds to the “coarse” field-aligned coordinate, whereas the poloidal cross section, comprised of the radial and poloidal directions, is finely gridded to resolve short-scale perpendicular turbulence structures and to support accurate re-mapping (interpolation) at block boundaries. The 5D simulations explore cross-separatrix ion scale turbulence in the presence of a self-consistent radial electric field and address the effects of magnetic-shear stabilization in the X-point region.
  • Editor: Melville: American Institute of Physics
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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