Full fluid moment model for low temperature magnetized plasmas
Full fluid moment model for low temperature magnetized plasmas
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DOI：
10.1063/5.0021474
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发表时间：
2020-11
影响因子：
2.2
通讯作者：
Rupali Sahu;A. Mansour;K. Hara
中科院分区：
文献类型：
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作者：
Rupali Sahu;A. Mansour;K. Hara
建立了低温部分磁化等离子体中剪切诱导电子输运的一维全流体矩模型。离子和电子被视为两种不同的流体，它们通过碰撞和电磁场相互作用。求解了流体的质量、动量和能量守恒，求解了泊松方程，得到了静电场。采用具有守恒律单调迎风格式的全局Lax-Friedrichs通量分裂格式进行无粘通量计算。由流体量构造的位移麦克斯韦分布的矩被用来计算边界处的通量，从此称为动力学通量。基于电子能量的处理，建立了两个完整的流体矩模型：(i)总能量和（ii）内能，即温度。采用全流体矩模型对霍尔效应推力器中的直流低温磁化等离子体进行了建模，并将结果与常用的低温等离子体漂移-扩散模型进行了比较，为跨场器件中电子剪切驱动的非经典电子输运提供了见解。
A one-dimensional full fluid moment model is developed to study shear-induced electron transport in low-temperature, partially magnetized plasmas. Ions and electrons are treated as two different fluids that interact with each other through collisions and electromagnetic fields. Conservation of mass, momentum, and energy is solved for both the fluids and the Poisson equation is solved to obtain the electrostatic electric field. A global Lax–Friedrichs flux splitting scheme with a monotonic upwind scheme for conservation laws is used for the inviscid flux calculation. Moments of a shifted Maxwellian distribution that is constructed from the fluid quantities are taken to calculate fluxes at the boundaries, henceforth called the kinetic fluxes. Two full fluid moment models are developed based on the treatment of the electron energy: (i) the total energy and (ii) the internal energy, i.e., temperature. A DC low-temperature magnetized plasma in a Hall effect thruster is modeled using the full fluid moment model and the results are compared with drift-diffusion models that are commonly used for low-temperature plasmas, providing insights into nonclassical electron transport driven by the electron shear in cross-field devices.