Spectral and spatial diagnostics on fluid moments in global particle-in-cell simulations
Event details
| Date | 15.11.2012 |
| Hour | 14:00 › 15:00 |
| Speaker |
Christoph Wersal Max-Planck-Institute für Plasmaphysik, Garching, D |
| Location |
PPB 019
|
| Category | Conferences - Seminars |
The theoretical understanding of mesoscale and microscale turbulence is required for developing a predictive capability of heat, particle and momentum transport in tokamaks and stellarators. During the last years, the global particle-in-cell gyrokinetic code ORB5 has been upgraded with intra- and inter-species Landau collision operators for ions and electrons and the ability to treat electromagnetic perturbations.
More recently, the code has been extended to include new 3D diagnostics allowing for measurements of electromagnetic potentials and relevant fluid quantities (density, temperature, vorticity) as well as turbulence spectral analysis. In this talk the results of these diagnostics are presented, focusing in particular on the convergence properties and the parametric dependencies of the different fluid quantities in experimentally relevant conditions. In particular, the number of markers resolution, required to correctly describe the particle density evolution, is found to be size-dependent: larger systems (ITER like) require less numerical particles per mode than smaller systems. In addition to this, the new diagnostics also allows for a direct comparison between gyrokinetic and gyrofluid turbulence simulations.
More recently, the code has been extended to include new 3D diagnostics allowing for measurements of electromagnetic potentials and relevant fluid quantities (density, temperature, vorticity) as well as turbulence spectral analysis. In this talk the results of these diagnostics are presented, focusing in particular on the convergence properties and the parametric dependencies of the different fluid quantities in experimentally relevant conditions. In particular, the number of markers resolution, required to correctly describe the particle density evolution, is found to be size-dependent: larger systems (ITER like) require less numerical particles per mode than smaller systems. In addition to this, the new diagnostics also allows for a direct comparison between gyrokinetic and gyrofluid turbulence simulations.
Practical information
- Expert
- Free
Organizer
- CRPP
Contact
- Prof. P. Ricci