Pressure–Strain Interaction as the Energy Dissipation Estimate in Collisionless Plasma
Pressure–Strain Interaction as the Energy Dissipation Estimate in Collisionless Plasma
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DOI：
10.3847/1538-4357/ac5d3e
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发表时间：
2022-02
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影响因子：
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通讯作者：
Y. Yang 杨;W. Matthaeus;Sohom Roy;V. Roytershteyn;T. Parashar;R. Bandyopadhyay;Minping 敏平 Wan 万
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作者：
Y. Yang 杨;W. Matthaeus;Sohom Roy;V. Roytershteyn;T. Parashar;R. Bandyopadhyay;Minping 敏平 Wan 万
弱碰撞等离子体中的耗散机制是一个贯穿了几十年的研究课题，但没有一个一致的解决方案。我们比较了几个能量耗散的估计等离子体湍流中的能量传递过程的基础上，并提供的压力-应变相互作用的能量耗散率的直接估计的理由。在2.5D和3D动力学模拟的全球和规模的能量平衡检查。我们发现，全球内部能量的增加和温度的提高，每个物种的压力-应变相互作用的直接跟踪。压力-应变相互作用的不可压缩部分在所有考虑的模拟中占主导地位。通过尺度过滤的Vlasov-Maxwell方程（动力学等离子体方法）和滞后相关的von Kármán-Howarth方程（基于流体模型的方法）量化了逐尺度能量平衡。我们发现，能量平衡是完全满足所有尺度，但缺乏一个定义良好的惯性范围的影响，在惯性范围内的不同条款之间的能量预算的分布。因此，广泛使用的Yaglom关系在估计耗散率是值得怀疑的，在某些情况下，特别是当系统中的尺度分离没有明确定义。与此相反，压力-应变相互作用平衡的耗散率在动力学尺度，无论尺度分离。
The dissipative mechanism in weakly collisional plasma is a topic that pervades decades of studies without a consensus solution. We compare several energy dissipation estimates based on energy transfer processes in plasma turbulence and provide justification for the pressure–strain interaction as a direct estimate of the energy dissipation rate. The global and scale-by-scale energy balances are examined in 2.5D and 3D kinetic simulations. We show that the global internal energy increase and the temperature enhancement of each species are directly tracked by the pressure–strain interaction. The incompressive part of the pressure–strain interaction dominates over its compressive part in all simulations considered. The scale-by-scale energy balance is quantified by scale filtered Vlasov–Maxwell equations, a kinetic plasma approach, and the lag dependent von Kármán–Howarth equation, an approach based on fluid models. We find that the energy balance is exactly satisfied across all scales, but the lack of a well-defined inertial range influences the distribution of the energy budget among different terms in the inertial range. Therefore, the widespread use of the Yaglom relation in estimating the dissipation rate is questionable in some cases, especially when the scale separation in the system is not clearly defined. In contrast, the pressure–strain interaction balances exactly the dissipation rate at kinetic scales regardless of the scale separation.