Discretization error estimation for EU‐DEMO plasma‐edge simulations using SOLPS‐ITER with fluid neutrals

Abstract

AbstractA grid refinement study is performed for mean‐field plasma boundary simulations with fluid neutrals in an EU‐DEMO geometry. In general, grid convergence of the simulations is achieved, with differences between the finest and second‐finest grid of <5% for the majority of the quantities of interest. The estimated discretization errors for the original 96 × 36 grid are mostly in the 4%–25% range. However, it is also shown that exceptions are possible due to the non‐linear nature of plasma boundary codes. Hence, it is advised to regularly perform grid refinement studies on subsets of cases.