Algebraic equations are solved by iteration with a line-by-line method that is a combination of TDMA in axial and radial directions, CTDMA in tangential direction and ADI method in three directions.

• 在轴向与径向用三对角矩阵法(TDMA)，在周向采用循环三对角矩阵法(CTDMA)，采用交替方向亚松弛叠代法(ADI)求解方程；