arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2008.06730math.NAcs.NA
收藏

非线性辐射传输方程的一种保渐近IMEX方法

An asymptotic-preserving IMEX method for nonlinear radiative transfer equation

Weiming Li, Peng Song, Yanli Wang

摘要:

在PN方法的框架下,提出了一种求解辐射传输方程的渐近保持方法。基于对分布函数展开系数的阶次分析,提出了一种隐式和显式相结合的方法求解P-N系统。通过Maxwell迭代过程求出了在Knudsen数中展开的各系数的阶数,并在P-N系统的各方程中显式处理高阶系数,隐式处理低阶系数.证明了该数值格式的能量不等式。几个数值例子验证了这种新的AP计划在光学厚和薄的区域。

英文摘要:

We present an asymptotic preserving method for the radiative transfer equations in the framework of PN method. An implicit and explicit method is proposed to solve the P N system based on the order analysis of the expansion coefficients of the distribution function. The order of each coefficient expanded in the Knudsen number is found through the process of Maxwellian iteration, and the coefficients of high order are treated explicitly while that of low order are treated implicitly in each equation of P N system. Energy inequality is proved for this numerical scheme. Several numerical examples validate this new AP scheme in both optical thick and thin regions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑