Mainz 2022 – scientific programme

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P: Fachverband Plasmaphysik

P 9: Poster I

P 9.3: Poster

Tuesday, March 29, 2022, 16:00–17:30, P

Extension of the Braginskii fluid model for edge turbulence simulations — •Christoph Pitzal, Andreas Stegmeir, and Frank Jenko — Max Planck Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching, Germany

Fluid models are a useful tool for plasma turbulence simulations. They are computationally less intense than kinetic models, but they have limited predictive capabilities. This arises from the fact, that not all effects are captured, which are necessary to simulate a fusion device sufficiently. The effects which are not contained are primarily kinetic effects, which are lost due to the missing velocity space, e.g. Landau damping. Because of the missing Landau damping, fluid models significantly overestimate the parallel heat conductivity, whenever the collisionality is small. An approach to introduce Landau damping into a fluid model was already shown in [1]. This approach is formulated solely in k-space. A method to translate this approach into configuration space and thus make it applicable for fluid codes, which operate in configuration space, is presented in [2]. In this project a simple one-dimensional toy model has been implemented and tested to reproduce and understand the Landau fluid closure introduced in [2]. Further the Landau fluid closure will be implemented into the plasma turbulence code GRILLIX [3]. [1] G. W. Hammett and F. W. Perkins, Phys. Rev. Lett., vol. 64, pp. 3019-3022, Jun 1990. [2] J. Chen et al., Computer Physics Communications, vol. 236, pp. 128-134, 2019. [3] A. Stegmeir et al., Physics of Plasmas, vol. 26, no. 5, p. 052517, 2019.