One of the common methods for solving the radiation transport equation is to use a polynomial expansion for the angle variable(s). Recent research that reduces the oscillations and improves the positivity of the gray transport equation solutions is here applied to the multigroup transport equations. Constant scale factors that stretch the time axis and constant scattering opacities that filter the solution greatly increase the accuracy of the solution with no added nonlinearities. No new solution techniques are required. Test problems are presented in one and two dimensions.

中文翻译：

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拉伸和过滤的多组Pn传输可改善正性和准确性

解决辐射传输方程的一种常用方法是对角度变量使用多项式展开。减少振荡并提高灰色输运方程解的正性的最新研究在此应用于多组输运方程。沿时间轴延伸的恒定比例因子和对解决方案进行滤波的恒定散射不透明度大大提高了解决方案的准确性，而没有增加任何非线性。不需要新的解决方案技术。测试问题以一维和二维表示。