Plasma transport in an Eulerian AMR code
Plasma transport in an Eulerian AMR code
复制标题
DOI：
10.1063/1.4979171
复制
发表时间：
2017-04
影响因子：
2.2
通讯作者：
E. Vold;R. Rauenzahn;C. Aldrich;K. Molvig;A. Simakov;B. Haines
中科院分区：
文献类型：
--
作者：
E. Vold;R. Rauenzahn;C. Aldrich;K. Molvig;A. Simakov;B. Haines
等离子体输运模型已在欧拉AMR辐射-流体力学程序xRage中实现，其中包括动量张量中的等离子体粘性，能量方程中的粘性耗散，以及由浓度梯度、离子和电子正压扩散项和温度梯度力驱动的具有一致物种质量和能量通量的二元混合。讨论了物理基础、计算问题、数值选择和几个试验问题的结果。当浓度以摩尔分数表示且离子质量差较大时，输运系数对动力学修正因子相对不敏感。在与Kelvin-Helmholtz不稳定性相关的惯性约束聚变混合层中，等离子体粘度和质量扩散对流动动力学的贡献随着尺度长度的减小而显著增加。试验中的混合垢长度约为100μm量级，对于粘性效应，混合垢长度较小。
A plasma transport model has been implemented in an Eulerian AMR radiation-hydrodynamics code, xRage, which includes plasma viscosity in the momentum tensor, viscous dissipation in the energy equations, and binary species mixing with consistent species mass and energy fluxes driven by concentration gradients, ion and electron baro-diffusion terms and temperature gradient forces. The physics basis, computational issues, numeric options, and results from several test problems are discussed. The transport coefficients are found to be relatively insensitive to the kinetic correction factors when the concentrations are expressed with the molar fractions and the ion mass differences are large. The contributions to flow dynamics from plasma viscosity and mass diffusion were found to increase significantly as scale lengths decrease in an inertial confinement fusion relevant Kelvin-Helmholtz instability mix layer. The mixing scale lengths in the test case are on the order of 100 μm and smaller for viscous effects ...