Abstract
This chapter describes the process of development of a new 3D scrape-off layer (SOL) transport code for the modeling of a fusion device. Magnetic coordinates are used for the description of the complex 3D geometry because it is easy to use standard discretization methods with this coordinate transform. The different plasma regions have different magnetic coordinates. All regions can be held in a single grid using the general grid generation. The Finite Volume Method leads to large sparse linear systems of equations. The chapter also presents a comparison of different iterative solvers—Krylov subspace projection methods including matrix-free variants and preconditioners with respect to their computational efficiency, grid size scaling, and memory requirements. Different schemes for interpolation of fluxes and gradients on scattered 3D data for general convection-diffusion problems can be used. These are elaborated in the chapter.
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