2D-Lagrangian code LATRANT for simulation radiation gas dynamic problems

European Conference on Laser Interaction with Matter Pub Date : 2003-12-12 DOI:10.1117/12.536544

E. Aristova, A. Iskakov, I. Lebo, V. Tishkin

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引用次数: 6

Abstract

United algorithm LATRANT for a simulation of a radiative gas flows in 2D cylindrical geometry has been developed on the basis of the gas-dynamic code ATLANT and the program for the radiation transport calculation LATRA. The developed program takes into account the radiation transport in the multi-group approximation and the gas dynamics within the framework of the improved Lagrangian method. Two modifications of LATRANT code for spherical and plane problems in r-z geometry respectively have been developed. A quasi-one-dimensional simulation of the heating and compression of a two-layer spherical target irradiated by isotropic X-rays has been carried out to demonstrate qualitative difference between LATRANT and three-temperature approximation results. Essentially 2D simulation of compression of the same target by the angular-nonhomogeneous radiation has revealed fuel preheating and radiative symmetrization of the inner shell compression, which are typical for the indirect compression schemes. Transition of infrared radiation to X-rays has been observed in 2D simulation of plain Al foil acceleration by Nd laser pulse.

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模拟辐射气体动力学问题的二维拉格朗日代码LATRANT

在气体动力学代码ATLANT和辐射输运计算程序LATRA的基础上，提出了二维圆柱形辐射气体流动模拟的统一算法LATRANT。该程序考虑了多群近似下的辐射输运和改进拉格朗日方法框架内的气体动力学。提出了两种分别适用于球面和平面几何问题的LATRANT代码的修正。本文对各向同性x射线辐照下两层球形目标的加热和压缩过程进行了准一维模拟，证明了LATRANT近似结果与三温度近似结果的质的区别。利用非均质角辐射对同一目标进行压缩的二维模拟，揭示了间接压缩方案中典型的燃料预热和内壳压缩辐射对称现象。用Nd激光脉冲对平面铝箔进行二维加速模拟，观察到红外辐射向x射线的转变。

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European Conference on Laser Interaction with Matter

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