Berlin 2014 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 22: Helmholtz Graduate School for Plasma Physics II
P 22.2: Fachvortrag
Donnerstag, 20. März 2014, 11:15–11:40, SPA HS202
Block Structured Grids for GENE (Gyrokinetic Electromagnetic Numerical Experiment) — Hans-Joachim Bungartz2, Tobias Görler1, •Denis Jarema2, Frank Jenko1, Tobias Neckel2, and Daniel Told1 — 1Max-Planck-Institut für Plasmaphysik, EURATOM-Assoziation, Boltzmannstraße 2, D-85748 Garching — 2Scientific Computing in Computer Science, Technische Universität München, Boltzmannstraße 3, 85748 Garching
In its global version, GENE computes the evolution of the particles distribution function in a five-dimensional space, whose geometrical part spans over a large part of a plasma confinement device. The temperature of the plasma may vary strongly inside the confinement device, leading to different properties of the background distribution functions in the velocities space. More specifically, in regions of high temperature, there are more particles showing high velocity values, corresponding to a distribution function with long wings and a smooth peak at the mean velocity value, whereas the distribution function for regions of relatively low temperature displays a sharp peak. Constructing a rectangular Cartesian grid requires thus a big interval of velocity values to account for the fast particles and a fine resolution to resolve the sharp peak. This leads to a considerable increase in the number of points of the five-dimensional regular grid, and makes computations slow and inefficient. We develop block-structured grids that are adjusted to the temperature profiles and have a significantly reduced number of points in comparison to rectangular grids, resulting in faster global plasma gyrokinetic simulations.