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

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.

preprint2016arXivOpen access
Brendan ShanahanPeter HillBen Dudson
physics.plasm-ph
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Brendan ShanahanPeter HillBen Dudson

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