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Crandall, P.; Jarema, D.; Doerk, H.; Pan, Q.; Merlo, G.; Görler, T.; Navarro, A. Bañón; Told, D.; Maurer, M.; Jenko, F.

Multi-species collisions for delta-f gyrokinetic simulations: implementation and verification with GENE. (English) Zbl 1523.82007

Comput. Phys. Commun. 255, Article ID 107360, 16 p. (2020).
Summary: A multi-species linearized collision operator based on the model developed by Sugama et al. has been implemented in the nonlinear gyrokinetic code, GENE. Such a model conserves particles, momentum, and energy to machine precision, and is shown to have negative definite free energy dissipation characteristics, satisfying Boltzmann’s H-theorem, including for realistic mass ratio. Finite Larmor Radius (FLR) effects have also been implemented into the local version of the code. For the global version of the code, the collision operator has been developed to allow for block-structured velocity space grids, allowing for computationally tractable collisional global simulations. The validity of the collision operator has been demonstrated by relaxation and conservation tests, as well as appropriate benchmarks. The newly implemented operator shall be used in future simulations to study magnetically confined fusion plasma turbulence and transport in more extreme regions with higher collisionality.

Cited in 3 Documents

MSC:

82D10 Statistical mechanics of plasmas
82-10 Mathematical modeling or simulation for problems pertaining to statistical mechanics
76F99 Turbulence
76W05 Magnetohydrodynamics and electrohydrodynamics

Keywords:

gyrokinetics; collisions; GENE

Software:

SLEPc
Cite Review PDF
Full Text: DOI

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