München 2019 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 18: Postersitzung

P 18.102: Poster

Donnerstag, 21. März 2019, 16:30–18:30, Foyer Audimax

Extending the fluid turbulence code GRILLIX to study general geometries — •Thomas Body, Andreas Stegmeir, Wladimir Zholobenko, and Alexander Ross — Max-Planck-Institut für Plasmaphyik, Garching bei München, Germany

GRILLIX implements the drift-reduced Braginskii equations in a 3D toroidal geometry. Due to the fluid approximation and drift-reduction it may simulate longer time-scales than a similar kinetic or gyro-kinetic code, at the cost of a reduced physics set. In contrast to transport codes, GRILLIX is able to self-consistently develop turbulent structures in divertor geometry, and currently being extended for more realism such as through the inclusion of neutrals.

The code uses the flux-coordinate independent (FCI) approach, which can easily deal with complex magnetic geometries. However, it is currently based on axisymmetric magnetic fields. This work shall discuss the push to non-axisymmetric magnetic fields with 3D boundaries. As a first step, the application of boundary conditions was made more flexible through the use of the penalisation technique, which allows for the treatment of nonconformal boundaries. Next steps include including a 3D field-line tracing method for the parallel operators, and adapting the perpendicular operators to allow for pitched magnetic fields through the use of tilted toroidal planes. These modifications will allow for comparison to results from stellarators such as W7X and spherical tokamaks like MAST-U. These comparisons will help with interpretation of results from these experiments, and with scaling of these results to reactor-relevant conditions.