Immersed boundary conditions in global, flux-driven, gyrokinetic simulations

A penalization technique is applied in global and flux driven gyrokinetic simulations to model a limiter configuration. The immersed boundary is implemented in terms of a restoring force to a cold distribution function. It acts as a perfect heat absorber. Parallel kinetic propagation of a cold front...

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Bibliographic Details
Published inJournal of physics. Conference series Vol. 1125; no. 1; pp. 12006 - 12019
Main Authors Caschera, E., Dif-Pradalier, G., Ghendrih, Ph, Grandgirard, V., Asahi, Y., Bouzat, N., Donnel, P., Garbet, X., Latu, G., Passeron, C., Sarazin, Y.
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.11.2018
Subjects
Boundary conditions
Cold fronts
Distribution functions
Propagation
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Summary:A penalization technique is applied in global and flux driven gyrokinetic simulations to model a limiter configuration. The immersed boundary is implemented in terms of a restoring force to a cold distribution function. It acts as a perfect heat absorber. Parallel kinetic propagation of a cold front generated by the limiter is tested with a 1-D 1-V single species model. An analytical expression is derived to describe the initial transient of the density, particle flux and energy profiles, induced by the ballistic propagation of the cold front in phase space(x, v). The same propagation is recovered in the global gyrokinetic code on the distribution function along the poloidal direction. The velocity of the front measured in the code matches the theoretical prediction.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/1125/1/012006