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P: Fachverband Plasmaphysik

P 25: Poster Session- Theory and Modelling

P 25.2: Poster

Donnerstag, 3. März 2016, 16:30–19:00, Empore Lichthof

Impact of the Boussinesq approximation on the blob propagation in the scrape-off layer — •Alexander Ross, Andreas Stegmeir, David Coster, and Emanuele Poli — Max-Planck-Institut für Plasmaphysik, 85748 Garching, Germany

The investigation of radial transport in the scrape-off layer showed that particles and heat are transported turbulently and mainly via field-aligned filaments, appearing as blobs. These blobs are believed to greatly impact the plasma-wall interaction. Here, we want to further explore the blob transport numerically. Starting from the drift reduced Braginskii equations a two-field full-f fluid model is developed, consisting of the continuity and vorticity equations. We do not make use of the commonly used Boussinesq approximation in the vorticity equation. Instead we present a numerical scheme for the important terms and discuss the impact of the Boussinesq approximation on the transport of blobs, first in a slab geometry. The numerical schemes are implemented in GRILLIX, a plasma turbulence code using the field line map approach, which is able to treat complex geometries, especially the separatrix and X-point of diverted magnetic fusion devices. The final goal is the research of the blob propagation in a realistic geometry.