辐射流体程序中的非局域电子热传导  

Nonlocal Electron Heat Conduction for Radiation Hydrodynamics Code

作　　者：袁文强 赵忠海 乔宾 YUAN Wenqiang;ZHAO Zhonghai;QIAO Bin(School of Physics,Peking University,Beijing 100871,China)

机构地区：[1]北京大学物理学院,北京100871

出　　处：《计算物理》2023年第2期232-240,共9页Chinese Journal of Computational Physics

基　　金：国家自然科学基金(12135001,11921006,11825502);国家杰出青年自然科学基金(11825502);中国科学院战略重点研究计划(XDA25050900)资助。

摘　　要：将考虑非局域效应的电子热传导模型耦合到辐射流体程序中,通过两种解析情况下的测试,计算结果与Fokker-Planck程序计算结果基本一致。将该程序应用到纳秒激光与固体靶相互作用上,发现电子热传导的非局域效应主要体现在相互作用早期等离子体冕区临界密度面先增大后减小的限流作用和后期烧蚀面附近逐渐增大的预热效应。这对理解惯性约束聚变尤其是直接驱动中的激光能量沉积和传输、流体力学不稳定性的产生与发展具有重要意义。Accurate electron heat conduction model is essential for understanding energy transport and dissipation during inertial confinement fusion and celestial burst process,and guiding the design of fusion capsule and experiment design of laboratory astrophysics.We successfully couple the non-local electron heat conduction model to the radiation hydrodynamics code,the simulation results of which in two analytical tests are basically consistent with the results calculated by the Fokker-Planck code.Applying the coupled code to the interaction between nanosecond laser and solid targets,we find that the non-local effect is mainly manifest in the time-dependent flux limited effect of the coronal critical surface in the early stage and the gradually enhanced preheating effect of the ablation surface in the late stage.These results are of great significance to clearly understand the laser energy deposition and transmission,and the generation and development of hydrodynamic instability in inertial confinement fusion,especially in direct drive.

关 键 词：非局域电子热传导 Schurtz-Nicola6-Busquet模型 限流作用 预热效应 

分 类 号：O53[理学—等离子体物理]