Bochum 2015 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 21: Theory and Modelling II

P 21.6: Vortrag

Mittwoch, 4. März 2015, 15:40–15:55, HZO 50

Adaptive Coupling of Different Plasma Models in Numerical Simulations — •Thomas Trost and Rainer Grauer — Institute for Theoretical Physics I, Ruhr-University Bochum, Germany

Plasmas are complex systems. Depending on the regime, different models are appropriate for describing a certain situation. In most cases of interest, the underlying equations can only be solved numerically and even that can be challenging, for example if kinetic effects in a two- or three-dimensional configuration are studied, as it is done in our project.

Nevertheless, many interesting plasma phenomena, as for example magnetic reconnection, depend on multiscale effects and exhibit a clear spatial separation of different regimes. This can be exploited for gaining significant speedup in numerical simulations by restricting the expensive solution of kinetic equations to the smallest region possible.

We present an algorithmic approach to combine kinetic and fluid models during the runtime of a simulation depending on the local plasma regime in an adaptive way. Subregions of the numerical domain are described with different plasma models and interact through carefully chosen boundary conditions. Furthermore, the kinetic equations are solved on graphic cards in order to obtain further speedup.

We present first examples of our method and compare them to previous results that were obtained with more conventional methods.