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3D Grid optimization for time-dependent MHD simulations of Stellarators

Author: James E. Stuber
Requested Type: Poster Only
Submitted: 2014-05-30 17:20:11

Co-authors: S. Woodruff, A. S. Ware, V. S. Lukin

Contact Info:
Woodruff Scientific Inc
4000 Aurora Ave N., Suite 6
Seattle, WA   98103
USA

Abstract Text:
The production of a grid for W7X poses some serious challenges, met with the HiFi code suite [1]. The discretization is performed by fitting to data produced by VMEC [2] of the boundary at slices around the torus up to 1/5 of the device (W7X has 5 periods). Slices are then fit with a parametric function and used to establish a mapping of real to logical coordinates in HiFi. Grid can then be extended to the full torus or periodic boundary conditions applied to the section. We discuss problems with this grid-mapping method and solutions that can be employed either by implementation of a 3D grid optimization routine (like FLUXGRID) or by use of inherent functionality such as parsing geometry with CUBIT [3] and use of rectangular mesh elements. We will
discuss our proposal to carry on some of this work in the context of the up-coming call for international collaborations for W7X. Application of the model to other stellarators will also be discussed.

[1] A.H. Glasser & X.Z. Tang, Comp. Phys. Comm.,164 (2004); V.S. Lukin, Ph.D. thesis, Princeton University (2008)
[2] W. I. van Rij and S. P. Hirshman, Phys. Fluids B 1, 563 (1989)
[3] https://cubit.sandia.gov/

Characterization: 3.0

Comments:

Workshop on Exploratory Topics in Plasma and Fusion Research (EPR) and US-Japan Compact Torus (CT) Workshop
August 5-8, 2014
Madison, Wisconsin

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