Improved non-local electron thermal transport model for two-dimensional radiation hydrodynamics simulations
Improved non-local electron thermal transport model for two-dimensional radiation hydrodynamics simulations
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DOI：
10.1063/1.4928445
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发表时间：
2015-08-01
影响因子：
2.2
通讯作者：
Delettrez, Jacques
中科院分区：
文献类型：
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作者：
Cao, Duc;Moses, Gregory;Delettrez, Jacques
一种隐式的非局部热传导算法，基于Schurtz，Nicolai和Busquet(SNB)开发的算法[Schurtz等人，Phys..等离子体7,4238(2000)]用于非局域电子传输，并已在辐射-流体动力学程序DRACO中实现。为了研究模型对Draco预测能力的影响，利用iSNB模型对OMEGA的60 303发子弹进行了模拟，并将计算的冲击波速度随时间的变化与实验进行了比较。将iSNB模型的温度输出与Goncharov等人的非局地输送模型进行了比较。[物理。等离子13,012702(2006年)]。在极地驱动替代模拟中也考察了绝热效应。结果表明，iSNB模型不仅具有流量限制能力，而且具有预热预报能力，同时具有较好的数值稳定性和较小的计算速度。此外，结果还为进一步修正SNB理论中的关键参数，即新引入的非局域平均自由程提供了强有力的激励。这项研究得到了罗切斯特大学激光能量学实验室的支持。(C)2015 AIP出版有限责任公司。
An implicit, non-local thermal conduction algorithm based on the algorithm developed by Schurtz, Nicolai, and Busquet (SNB) [Schurtz et al., Phys. Plasmas 7, 4238 (2000)] for non-local electron transport is presented and has been implemented in the radiation-hydrodynamics code DRACO. To study the model's effect on DRACO's predictive capability, simulations of shot 60 303 from OMEGA are completed using the iSNB model, and the computed shock speed vs. time is compared to experiment. Temperature outputs from the iSNB model are compared with the non-local transport model of Goncharov et al. [Phys. Plasmas 13, 012702 (2006)]. Effects on adiabat are also examined in a polar drive surrogate simulation. Results show that the iSNB model is not only capable of flux-limitation but also preheat prediction while remaining numerically robust and sacrificing little computational speed. Additionally, the results provide strong incentive to further modify key parameters within the SNB theory, namely, the newly introduced non-local mean free path. This research was supported by the Laboratory for Laser Energetics of the University of Rochester. (C) 2015 AIP Publishing LLC.