Benchmarking between fluid and global models for low-pressure oxygen DC glow discharges

Numerical modelling is used to understand physical phenomena and to characterize electrical discharges, where many important quantities are often difficult to measure. Plasma models can have different dimensionality. On the one hand, zero-dimensional global models treat physical quantities as volume averages and are often used to describe homogeneous plasmas or to focus on complex kinetic processes. On the other hand, spatially-resolved fluid models are an effective way to describe spatial gradients in plasmas. In this work, a global model and a one-dimensional (1D-radial) fluid model are used to describe low-pressure (0.5 to 10 Torr) oxygen DC glow discharges. The used set-up and the resulting discharges have been well characterized through both experiments and simulations, and thus constitute ideal test-cases for benchmarking different models. The two models consider the same input parameters and reaction set. Their simulation results are compared and their appropriateness for the description of different discharge conditions is evaluated.