Drift-diffusion plasma fluid models are commonly used to simulate electric discharges. Such models can computationally be very efficient if they are combined with explicit time integration. This paper deals with two issues that often arise with such models. First, a high plasma conductivity can severely limit the time step. A fully explicit method to overcome this limitation is presented. This method is compared to the existing semi-implicit method, and it is shown to have several advantages. A second issue is specific to models with the local field approximation. Near strong density and electric field gradients, electrons can diffuse parallel to the field, and unphysically generate ionization. Existing and new approaches to correct this behavior are compared. Details on the implementation of the models and the various approaches are provided.

中文翻译：

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显式时间积分漂移扩散等离子体流体模型的改进

漂移扩散等离子体流体模型通常用于模拟放电。如果将此类模型与显式时间积分相结合，它们的计算效率会非常高。本文讨论了此类模型经常出现的两个问题。首先，高等离子体电导率会严重限制时间步长。提出了一种完全明确的方法来克服这一限制。将该方法与现有的半隐式方法进行比较，并显示出它有几个优点。第二个问题特定于具有局部场近似的模型。在接近强密度和电场梯度的情况下，电子可以平行于场扩散，并以非物理方式产生电离。比较了纠正这种行为的现有方法和新方法。提供了有关模型实施和各种方法的详细信息。