激光烧蚀过程中电子热输运的Fokker-Planck与流体模拟研究

Based on our one-dimensional planar Fokker-Planck code, cylindrical and spherical geometry choice are extended in the program and real equation of state is also incorporated . Using the Fokker-Planck and fluid simulation, the ablation process are simulated to investigate electron thermal transport. Firstly, nonlocal thermal transport in the shock ignition is simulated under spherical geometry, whose effects on the strength and production of shock and ablation pressure are carefullyinvestigated. Secondly, Cylindrical and spherical shell target filled with gas are simulated by using Fokker-Planck simulation with different boundary condition. the effects of different boundary condition and spatial geometry on electron transport are analyzed and compared. Thirdly, the effectiveness and applicability of non-local transport model are studied by using the fluid simulations to match the results computed by Fokker-Planck simulation, and new thermal transport model is supposed to be presented.Fourthly, preheating are investigated by inclusion of real equation of state process, and new preheating formula is expected to be presented.

将现有的Fokker-Planck程序，拓展到包含流体运动的一维柱对称、球对称空间位型下，并将真实的状态方程耦合到Fokker-Planck程序中。利用Fokker-Planck与流体模拟相结合的方法，研究激光烧蚀过程的电子热输运：1）采用上述两种模拟手段，在球对称空间位型下对冲击波点火的烧蚀过程进行模拟，细致考察电子非局域热输运对冲击波强度与形成的作用，以及对烧蚀压的影响；2）以充气的一位柱对称、球对称位型为简化模型，考察研究不同的几何位型和边界效应对靶壁膨胀等离子体电子热输运的修正；3）以Fokker-Planck模拟为参照，对比研究非局域热输运卷积模型耦合到流体计算的适用性，探索更实用的有效描述模型；4）研究状态方程对电子非局输运模型、稠密等离子体区域预热效应的修正，并建立相应的电子非局域热输运预热模型。

本研究项目的结果包括以下方面内容：1）发展了考虑一维柱对称、球对称位型下流体演化的Fokker-Planck程序，对程序进行了校验，以发展的程序为模拟手段，对柱位型、球位型下的激光烧蚀过程进行了模拟，并结合相应的流体模拟进行对比研究；2）利用Fokker-Planck模拟与流体模拟对比研究了冲击波点火的激光烧蚀与内爆物理过程，模拟发现非局域预热效应有利于点火激波的维持和传播；我们还研究限流因子的不同取值对冲击波速度和内爆过程的影响； 3）模拟计算了柱对称、球对称位型下的电子非局域热流，研究揭示了几何位型对电子非局域热传导的影响，并给出球对称位型下非局域热流的模型公式；4）通过修正流体输运系数与热容，发展了考虑动理学效应与状态方程的广义流体涨落理论模型。