GRILLIX: A 3D turbulence code for magnetic fusion devices based on a field line map
Event details
| Date | 19.01.2016 |
| Hour | 14:00 › 15:00 |
| Speaker | Dr. A. Stegmeir, Max-Planck-Institut für Plasmaphysik, Garching, Germany |
| Location |
PPB 019
|
| Category | Conferences - Seminars |
The complex geometry in the edge and scrape-off layer poses a challenge to simulations of magnetically confined plasmas. The usually employed field/flux-aligned coordinates become singular on the separatrix/X-point. The field line map approach constitutes a promising solution to these problems. The approach is based on a cylindrical grid, and the characteristic flute mode property (k||<<k^) of structures is exploited computationally via grid sparsification in the toroidal direction. A field line following discretisation for parallel operators is then required, which includes field line tracing and interpolation or integration. The seperatrix and the X-point(s) are thereby handled without any special treatment. However, a major drawback of the approach is numerical perpendicular diffusion caused by numerical coupling among distinct field lines. A new numerical scheme for the parallel diffusion operator is presented, which is based on the support operator method and exhibits only a very low level of numerical diffusion. The concept is implemented in the code GRILLIX: Extensive benchmarks show the validity of the field line map approach in general and GRILLIX in particular. Results obtained with a simple turbulence model (Hasegawa-Wakatani), concerning geometric effects of the X-point on turbulent structures, are shown. An outlook and first results of current effort is given, which adresses the extension of the physical model in GRILLIX towards a full-f drift reduced Braginskii model.
Practical information
- Informed public
- Free
Organizer
- Prof. P. Ricci
Contact
- Prof. P. Ricci