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A Mesh-Generation Scheme for the Large Helical Device Based on the Structure of Magnetic-Field Lines

Daisuke TAKADA, Taku ITOH¹⁾, Masahiro KOBAYASHI²⁾ and Hiroaki NAKAMURA^2,3)

Graduate School of Industrial Technology, Nihon University, Narashino 275-8575, Japan

1)

College of Industrial Technology, Nihon University, Narashino 275-8575, Japan

2)

National Institute for Fusion Science, Toki 509-5292, Japan

3)

Department of Electrical Engineering, Nagoya University, Nagoya 464-0813, Japan

(Received 30 November 2020 / Accepted 12 February 2021 / Published 5 July 2021)

Abstract

We report herein an automated scheme for generating a mesh based on a structure of magnetic-field lines. For all angles in the toroidal subdomain, the mesh generated by this scheme must not contain broken tetragons. To satisfy this requirement, we propose herein a first method to detect broken elements and a second method to automatically modify the broken elements. We use the proposed mesh-generation scheme with magnetic-field data acquired on the magnetic axis of the Large Helical Device at R_ax = 3.75 m. The results show that broken elements are detected by the first method, and the second method transforms broken elements into regular elements.

Copyright (c) 2021 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

automatic mesh generation, tracing magnetic field line, detection of broken element, Large Helical Device, toroidal subdomain

DOI: 10.1585/pfr.16.2401086

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References

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