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离散纵标法在计算大空腔、强吸收介质模型时会存在射线效应问题,使得通量密度呈现出空间震荡如锯齿波纹状分布。本文描述和分析射线效应及其产生原因,由于离散纵标法在求解输运方程时只沿特定的方向进行,把原来连续的方向变量转换成有限离散方向求解,而离散求积组不具备完整描述输运问题通量密度分布的能力。通过对主流方法进行研究分析,采取首次碰撞源方法作为目前主要的研究方向,自主开发了多维射线效应消除程序RAY,基准题的计算表明RAY能够有效地减弱射线效应。
Discrete ordinate method has the problem of ray effect in the calculation of large cavity and strong absorption medium model, which makes the flux density appear spatial vibration such as sawtooth corrugated distribution. This article describes and analyzes the ray effects and their causes. Because the discrete ordinate method only solves the transport equation in a specific direction, the original continuous direction variable is converted into a finite discrete direction solution, while the discrete quadrature set does not have the complete Describe the ability to transport flux density distributions. Based on the research and analysis of the mainstream methods, the first collision source method is taken as the main research direction at present and a multi-dimensional ray effect elimination program RAY is independently developed. The calculation of the benchmark questions shows that RAY can effectively reduce the radiation effect.