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3D fluid modeling of positive streamer discharges in air with stochastic photoionization

机译:用随机摄影加工的空气中的3D流体建模

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Streamer discharges are thin plasma channels that precede lightning and sparks. They usually evolve in bundles as stochastic tree-like structures and are inherently difficult to model due to their multiscale nature. In this paper, we perform a computer investigation of positive streamer discharges in air using contemporary photoionization models. We report on three-dimensional computer simulations under conditions that are available in laboratory spark-gap experiments. The solutions demonstrate a multiscale morphology consisting of streamer fluctuations, branching, and the formation of a discharge tree. Some branches are comparatively thick and noisy, while others are thin, smooth, and carry electric fields exceeding 250 kVcm~(?1) at their tips. Our results are consistent with past experiments and clarify the puzzling branching dynamics and stochastic morphology of positive streamer discharges.
机译:流光放电是闪电和火花之前的薄等离子体通道。它们通常以束的形式演化为随机树状结构,由于其多尺度性质,固有地难以建模。在本文中,我们使用当代光电离模型对空气中的正流光放电进行了计算机研究。我们报告了实验室火花隙实验条件下的三维计算机模拟。这些解决方案展示了多尺度形态,包括流光波动、分支和放电树的形成。有些树枝相对较粗且嘈杂,而另一些树枝较薄、光滑,其尖端的电场超过250 kVcm~(-1)。我们的结果与过去的实验一致,并澄清了令人费解的分支动力学和正流光放电的随机形态。

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