Comparison for non-local hydrodynamic thermal conduction models
Comparison for non-local hydrodynamic thermal conduction models
复制标题
DOI：
10.1063/1.4789878
复制
发表时间：
2013-02-01
影响因子：
2.2
通讯作者：
Feugeas, J. -L.
中科院分区：
文献类型：
--
作者：
Marocchino, A.;Tzoufras, M.;Feugeas, J. -L.
惯性约束核聚变，特别是激波点火涉及的温度和温度梯度使经典的Spitzer-Harm热传导失效，并且需要非局部算子。本文用动力学Vlasov-Fokker-Planck模拟对两种非局域电子热传导模型进行了测试。两种模式都能在动力学时间尺度上再现热锋面传播的主要特征。热导率的降低作为温度梯度尺度长度的函数也被恢复。在纳秒时间尺度上的比较表明，模型对热锋的传播速度计算一致，但在热前驱体上存在较大差异。(C) 2013年美国物理研究所。[http://dx.doi.org/10.1063/1.4789878]
Inertial confinement fusion and specifically shock ignition involve temperatures and temperature gradients for which the classical Spitzer-Harm thermal conduction breaks down and a non-local operator is required. In this article, two non-local electron thermal conduction models are tested against kinetic Vlasov-Fokker-Planck simulations. Both models are shown to reproduce the main features of thermal heat front propagation at kinetic timescales. The reduction of the thermal conductivity as a function of the scalelength of the temperature gradient is also recovered. Comparisons at nanosecond timescales show that the models agree on the propagation velocity of the heat front, but major differences appear in the thermal precursor. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4789878]