| Autor: |
Rozar Fabien, Steiner Christophe, Latu Guillaume, Mehrenberger Michel, Grandgirard Virginie, Bigot Julien, Cartier-Michaud Thomas, Roman Jean |
| Jazyk: |
angličtina |
| Rok vydání: |
2016 |
| Předmět: |
|
| Zdroj: |
ESAIM: Proceedings and Surveys, Vol 53, Pp 191-210 (2016) |
| Druh dokumentu: |
article |
| ISSN: |
2267-3059 |
| DOI: |
10.1051/proc/201653012 |
| Popis: |
Gyrokinetic modeling is appropriate for describing Tokamak plasma turbulence, and the gyroaverage operator is a cornerstone of this approach. In a gyrokinetic code, the gyroaveraging scheme needs to be accurate enough to avoid spoiling the data but also requires a low computation cost because it is applied often on the main unknown, the 5D guiding-center distribution function, and on the 3D electric potentials. In the present paper, we improve a gyroaverage scheme based on Hermite interpolation used in the Gysela code. This initial implementation represents a too large fraction of the total execution time. The gyroaverage operator has been reformulated and is now expressed as a matrix-vector product and a cache-friendly algorithm has been setup. Different techniques have been investigated to quicken the computations by more than a factor two. Description of the algorithms is given, together with an analysis of the achieved performance. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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