Immersed boundary conditions in global, flux-driven, gyrokinetic simulations. (November 2018)

• Record Type: Journal Article
• Authors: Caschera, E.; Dif-Pradalier, G.; Ghendrih, Ph.; Grandgirard, V.; Asahi, Y.; Bouzat, N.; Donnel, P.; Garbet, X.; Latu, G.; Passeron, C.; Sarazin, Y.
• Is Part Of: Journal of physics. Volume 1125(2018)
• Publication Date: 2018-11
• Subjects: Physics -- Congresses; 530.5
• DOI: 10.1088/1742-6596/1125/1/012006
• Languages: English
• ISSNs: 1742-6588

Abstract

Abstract: 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.