Theoretical Calculations of Opacity for Non-Local-Thermodynamic-Equilibrium Plasmas

A method is presented to calculate the spectral-resolved opacity for non-local-thermodynamic-equilibrium plasmas. With the present method, the configuration population is obtained by solving the rate equations within the framework of configuration-averaged approximation in which the cross sections are calculated based on the first-order perturbation theory. The transition properties are calculated by using the unresolved transition array model. As the illustration, the frequency-dependent opacities of AI and Au plasmas are calculated and compared with the simulation results of the super configuration collisional radiative code. General agreements are obtained and there are some discrepancies for opacity of high-Z elements.     

Opacity Calculations for Non—Local Thermodynamic Equilibrium Mixtures

Based on the average atom model,a non-local thermodynamic equilibrium (non-LTE) model is developed to calculate opacity for mixtures.This model could be applied to high-Z problems.The mean ionization degrees of SiO2 of the present calculation are slightly higher compared with another model for mixtures.As an example.the opacity of Au and Nd mixture is calculated.The results show concrete non-LTE effects and the increase in opacity of the mixture is shown clearly.     

Ionization Balance in Non-Local-Thermodynamic-Equilibrium Plasmas

A collisional-radiative model is developed for population calculations of plasmas in non-local thermodynamic equilibrium. The rate equations in detailed configuration accounting are solved to obtain ion populations. The configuration averaged rate coefficients are used in the rate equations. The cross sections are calculated based on the first perturbation theory. Wavefunctions required in cross section calculations are obtained by the Hartree-Fock-Slater self-consistent-field model. This kinetic model is applied to low- and medium-Z as well as high-Zplasmas. The results are compared with those of other theoretical models and experiments. The comparisons show that the present results of the mean charge statetheoretical ones, while for high-Z elements, the presentthe experimental ones.for low- and medium-Z elements agree well with other theoretical ones, while for high-Z elements, the present mean ionization stages are about two stages lower than the experimental ones.     

求解含温Thomas—Fermi方程的打靶法

提出一种直接求解在某温度，密度条件下Ｔｈｏｍａｓ－Ｆｅｒｍｉ（以下简称ＴＦ）方程的数值计算方法－打靶法。同时介绍了为使打靶法收敛而采用的调节试探值的方法，最后给出一些元素的计算结果。     

分布式存储环境下非平衡刚性方程组的数值并行计算

采用非平衡刚性方程组的数值模拟计算来研究辐射的非平衡现象,分析了数值模拟计算过程中的并行性,提出一种负载平衡方法,为了增加数据局部性提出了一种多机串行计算方法.给出相应的并行算法,分析了并行算法的通信复杂性,给出了工作站机群上的测试结果.