High-order numerical methods for laser plasma modeling.
High-order numerical methods for laser plasma modeling.
复制标题
激光等离子体建模的高阶数值方法。
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
J. Velechovský
中科院分区：
文献类型：
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作者：
J. Velechovský
本文对高阶任意拉格朗日-欧拉（ALE）方法进行了综述和创新性的研究，重点研究了ALE方法中的重映射步骤。重映射是保守插值的保守量从一个低质量的拉格朗日网格到一个更好的，平滑的。为了避免非物理的数值振荡，重建的高阶数值通量与由标准施主重映射方法产生的低阶（一阶）数值通量相结合。所提出的方法为一个细胞中心的离散化保留其建设的密度，速度和特定的内部能量的界限。该方法的特殊的保序方面适用于交错动量重映射。本文的应用部分致力于激光在等离子体和微结构材料中的吸收模型，特别是低密度泡沫材料的激光吸收。同时在两个空间尺度上对吸收进行建模。该双尺度激光吸收模型在流体动力学程序PALE中实现。对激光在低密度泡沫材料中的穿透速度进行了数值模拟，模拟结果与实验结果吻合较好。
This thesis presents the overview and the original contributions to a high–orderArbitrary Lagrangian–Eulerian (ALE) method applicable for the laser–generated plasma modeling withthe focus to a remapping step of the ALE method. The remap is the conservative interpolation of theconservative quantities from a low–quality Lagrangian grid onto a better, smoothed one. To avoidnon–physical numerical oscillations, the high–order numerical fluxes of the reconstruction arecombined with the low–order (first–order) numerical fluxes produced by a standard donor remappingmethod. The proposed method for a cell–centered discretization preserves bounds for the density,velocity and specific internal energy by its construction. Particular symmetry–preserving aspects of themethod are applied for a staggered momentum remap. The application part of the thesis is devoted tothe laser radiation absorption modeling in plasmas and microstructures materials with the particularinterest in the laser absorption in low–density foams. The absorption is modeled on two spatial scalessimultaneously. This two–scale laser absorption model is implemented in the hydrodynamic codePALE. The numerical simulations of the velocity of laser penetration in a low–density foam are in agood agreement with the experimental data.
影响因子：
4.1
作者：
HIRT, CW;AMSDEN, AA;COOK, JL
通讯作者：
COOK, JL