离散纵标六角形节块法及CMFD加速研究

Discrete Ordinate Hexagonal Nodal Method and CMFD Acceleration Technique

  • 摘要: 离散纵标节块法是一种求解六角形中子输运方程的有效方法。本文基于六角形横向积分离散纵标方程,解析得到横向积分通量出射通量与入射通量的关系,并根据类似于扩散方法的六角形输运节块中子平衡方程形式,得到了一种离散纵标六角形节块法数值迭代策略。由于离散纵标法收敛速度较慢,本文根据粗网有限差分(CMFD)技术导出离散纵标六角形CMFD加速方法。数值计算结果表明,该CMFD加速技术能取得约16倍的加速效果。

     

    Abstract: Discrete ordinate nodal method is a very effective method for solving the hexagonal neutron transport equation. Based on hexagonal transverse integrated discrete ordinate equation, the relationship of transverse integrated outgoing and incoming fluxes was analytically obtained. With hexagonal transport nodal neutron balance equation analog to diffusion method, a discrete ordinate hexagonal nodal numerical iteration strategy was obtained. Because discrete ordinate method converges slowly, a coarse mesh finite difference (CMFD) method was introduced for acceleration of hexagonal discrete ordinate method. Numerical results indicate that the method can achieve approximately 16 times accelerating effect.

     

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