使用广义粗网有限差分方法加速中子输运特征线方法

Generalized Coarse-mesh Finite Difference Acceleration for Method of Characteristics in Unstructured Meshes

提出广义粗网有限差分方法(GCMFD),可以使用三维任意几何形状的粗网格来加速中子输运特征线方法(MOC),同时给出确定广义粗网有限差分方法中宽度因子的方法.将广义粗网有限差分方法应用到三维特征线方法程序TCM中,若干基准题的验证表明,广义粗网有限差分方法可以使用任意形状粗网格来加速特征线方法,使用自动调整宽度因子的方法后,广义粗网格有限差分方法可以得到较好的加速效果.

Generalized coarse-mesh finite difference（GCMFD） method,which uses generalized-geometry coarse meshes to speed up the method of characteristics（MOC）,is proposed.A method adjusting width factor automatically is adopted in the GCMFD method.The GCMFD method is adopted in a 3-D neutron transport MOC code TCM.Numerical tests are used to verify acceleration effect of GCMFD in TCM.It shows that the GCMFD method can use generalized-geometry coarse meshes to accelerate MOC iteration,and the GCMFD method with automatically adjusting width factor has good acceleration effect.