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讨论了用微分方程数值解法计算锥体电阻时,不适当的侧面边界条件差分格式所引入的附加误差问题.通过对不同差分格式的理论分析及实际计算效果对比发现,在侧面边界上,如忽略轴对称准三维问题与二维问题的差异,则所用边界条件的差分格式会引入明显的附加误差.讨论了适用于类似的锥形体上微分方程的求解,给出了处理锥体侧面边界条件时较适用的差分格式.与直接用差分代替微分产生的差分格式相比,在网络数相同的情况下能得到较精确的数值解.
This paper discusses the additional error introduced by the inappropriate differential format of the lateral boundary conditions when calculating the pyramidal resistance by using the numerical solution of the differential equation. By comparing the theoretical analysis of the different difference schemes and the actual calculation results, it is found that on the side boundary, Axisymmetric quasi-three-dimensional problems and two-dimensional problems, the difference format of the boundary conditions used will introduce significant additional errors.The solution of a differential equation applicable to a similar cone is discussed, and the boundary condition of the cone is given The more suitable differential format.Compared with the differential format which directly uses the differential instead of the differential, the exact numerical solution can be obtained under the condition of the same network number.