Comment on "Improvements for drift-diffusion plasma fluid models with explicit time integration"

TL;DR

This paper critically evaluates Teunissen's explicit current-limit method for drift-diffusion plasma models, highlighting its mathematical inconsistency and discussing why this flaw was initially overlooked.

Contribution

It provides a critical analysis of the current-limit approach, revealing its mathematical inconsistency and clarifying potential reasons for the oversight.

Findings

The current-limit approach is mathematically inconsistent.

The inconsistency may have been overlooked due to subtlety.

The paper clarifies the limitations of explicit methods in plasma modeling.

Abstract

Recently, J. Teunissen reported a fully explicit method, namely the current-limit approach, which claimed to overcome the dielectric relaxation time restriction for the drift-diffusion plasma fluid model. In this comment, we point out that the current-limit approach is not mathematically consistent, and discuss about the possible reason why the inconsistency was not visibly noticed.