Jena 2013 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 19: Poster: Theorie und Modellierung
P 19.10: Poster
Donnerstag, 28. Februar 2013, 14:00–16:00, Poster EG
Coupling of drift-fluid turbulence to large-scale transport codes — •Felix Hasenbeck1, Dirk Reiser1, Philippe Ghendrih2, Yannick Marandet3, Patrick Tamain2, and Detlev Reiter1 — 1IEK-4 - Plasma Physics, Forschungszentrum Jülich GmbH, Jülich, Germany — 2CEA-IRFM, F-13108 Saint-Paul-lez-Durance, France — 3Aix-Marseille Université, CNRS, PIIM, UMR 7345, F-13397 Marseille Cedex 20, France
Radial particle transport in the edge of tokamak plasmas is governed by turbulence. Corresponding simulations of the edge layer are very time consuming due to the high resolution in time and space needed to capture the relevant processes. Large-scale transport codes mostly use empirical coefficients for diffusion/convection, selected to reproduce experimental findings. This work aims at coupling turbulence and large-scale codes to model transport in accordance with drift-fluid physics without increasing the need for computational power enormously. An analysis of correlation lengths and times of drift-fluid turbulence systems has been carried out to gain information about the scales involved. This helps to evaluate in how far scale separation holds and to find appropriate coarse-graining intervals for handing information about the flux to the large-scale code. Both the 2D, two-field code TOKAM-2D and the 3D, four-field code ATTEMPT have been used for analysis. Additionally, simulations with a 1D code with sampled diffusion coefficients, meant to mimic some aspects of turbulence, were carried out. Thereby, the influence of the sampling intervals in time and space on the density profiles was investigated.