Towards nonaxisymmetry; initial results using the Flux Coordinate Independent method in BOUT++

Brendan William Shanahan, Peter Alec Hill, Benjamin Daniel Dudson

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Abstract

Fluid simulation of stellarator edge transport is difficult due to the complexities of mesh generation; the stochastic edge and strong nonaxisymmetry inhibit the use of field aligned coordinate systems. The recent implementation of the Flux Coordinate Independent method for calculating parallel derivatives in BOUT++ has allowed for more complex geometries. Here we present initial results of nonaxisymmetric diffusion modelling as a step towards stellarator turbulence modelling. We then present initial (non-turbulent) transport modelling using the FCI method and compare the results with analytical calculations. The prospects for future stellarator transport and turbulence modelling are discussed.
Original languageEnglish
JournalJournal of Physics: Conference Series
Publication statusAccepted/In press - 22 Sept 2016

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