A wall-aligned grid generator for non-linear simulations of MHD instabilities in tokamak plasmas

JET Contributors, MAST Team, JOREK Team, S. Pamela (Corresponding author), G. Huijsmans, A.J. Thornton, A. Kirk, S.F. Smith, M. Hoelzl, T. Eich

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Block-structured mesh generation techniques have been well addressed in the CFD community for automobile and aerospace studies, and their applicability to magnetic fusion is highly relevant, due to the complexity of the plasma-facing wall structures inside a tokamak device. Typically applied to non-linear simulations of MHD instabilities relevant to magnetically confined fusion, the JOREK code was originally developed with a 2D grid composed of isoparametric bi-cubic Bézier finite elements, that are aligned to the magnetic equilibrium of tokamak plasmas (the third dimension being represented by Fourier harmonics). To improve the applicability of these simulations, the grid-generator has been generalised to provide a robust extension method, using a block-structured mesh approach, which allows the simulations of arbitrary domains of tokamak vacuum vessels. Such boundary-aligned grids require the adaptation of boundary conditions along the edge of the new domain. Demonstrative non-linear simulations of plasma edge instabilities are presented to validate the robustness of the new grid, and future potential physics applications for tokamak plasmas are discussed. The methods presented here may be of interest to the wider community, beyond tokamak physics, wherever imposing arbitrary boundaries to quadrilateral finite elements is required.

LanguageEnglish
Pages41-50
Number of pages10
JournalComputer Physics Communications
Volume243
DOIs
StatePublished - 1 Oct 2019

Fingerprint

Plasma stability
Magnetohydrodynamics
generators
grids
Plasmas
Fusion reactions
Physics
simulation
Tokamak devices
fusion
tokamak devices
Facings
physics
Mesh generation
automobiles
charge flow devices
Automobiles
vessels
mesh
Computational fluid dynamics

Keywords

  • ELM
  • Fusion
  • Grid
  • Instability
  • MHD
  • Tokamak

Cite this

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abstract = "Block-structured mesh generation techniques have been well addressed in the CFD community for automobile and aerospace studies, and their applicability to magnetic fusion is highly relevant, due to the complexity of the plasma-facing wall structures inside a tokamak device. Typically applied to non-linear simulations of MHD instabilities relevant to magnetically confined fusion, the JOREK code was originally developed with a 2D grid composed of isoparametric bi-cubic B{\'e}zier finite elements, that are aligned to the magnetic equilibrium of tokamak plasmas (the third dimension being represented by Fourier harmonics). To improve the applicability of these simulations, the grid-generator has been generalised to provide a robust extension method, using a block-structured mesh approach, which allows the simulations of arbitrary domains of tokamak vacuum vessels. Such boundary-aligned grids require the adaptation of boundary conditions along the edge of the new domain. Demonstrative non-linear simulations of plasma edge instabilities are presented to validate the robustness of the new grid, and future potential physics applications for tokamak plasmas are discussed. The methods presented here may be of interest to the wider community, beyond tokamak physics, wherever imposing arbitrary boundaries to quadrilateral finite elements is required.",
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A wall-aligned grid generator for non-linear simulations of MHD instabilities in tokamak plasmas. / JET Contributors; MAST Team; JOREK Team; Pamela, S. (Corresponding author); Huijsmans, G.

In: Computer Physics Communications, Vol. 243, 01.10.2019, p. 41-50.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Thornton,A.J.

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