The collision of two expanding plasma flows is investigated with an emphasis on the mixing flow. The study adheres to laboratory experiments where two Ohmically exploding parallel wires launch hot plasma coronas toward each other. The interpenetration and mixing of the coronas is followed by the collision and mixing of the slowly moving phases of the melted wires. In a recent publication [M. A. Malkov and V. I. Sotnikov, Phys. Plasmas 25(10), 102108 (2018)], a stationary flow that emerges from interpenetrating coronas and plasma microinstabilities in the mixing region had been studied analytically. In this present work, using two-dimensional numerical simulations, we investigate the time evolution of the flow, compare its patterns resulting from collisions of the rarefied coronas and dense wire material, and examine the macroscopic stability of the flow. The stability of the mixing layer with respect to the so-called thin-shell instability is specifically addressed.

中文翻译：

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膨胀的等离子云碰撞：混合，流动形态和不稳定性

研究了两个膨胀等离子体流的碰撞，重点是混合流。这项研究坚持实验室实验，其中两条欧姆爆炸的平行导线相互发射热等离子体电晕。电晕的相互渗透和混合之后，是熔融金属丝的缓慢移动相的碰撞和混合。在最近的出版物中[MA Malkov and VI Sotnikov，Phys。等离子25（10），102108（2018）]，通过分析研究了混合区域中互穿的电晕和等离子体微不稳定性产生的平稳流动。在目前的工作中，我们使用二维数值模拟研究流动的时间演化，比较稀薄电晕和致密线材碰撞产生的流动模式，并检查流动的宏观稳定性。具体解决了混合层相对于所谓的薄壳不稳定性的稳定性。