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

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 magneticfield 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.