GRILLIX comprises numerical methods, algorithms as well as physics models for the simulation of turbulence in the boundary of magnetic confinement fusion devices.
The physics models mainly comprise of 3D drift-reduced fluid equations. Note that fluid models have restrictions in terms of validity in magnetic confinement fusion devices due to the typically not so high collisionality. Transcollisional extensions are thus often utilised.
The simplest available model is (anisotropic) diffusion. It is simple enough to quickly get familiar with, yet it showcases a significant fraction of the numerical capabilities of the code.
The most complete plasma model is the extended, global, electromagnetic, drift-reduced Braginskii set of equations.
For the consideration of multiple ion species, the Zhdanov model is currently in development.
Additionally, the plasma is strongly coupled to neutral gas. This is described with a Neutrals fluid model.