针对有限差分问题中的均匀网格技术存在的弊端提出了变网格技术,并提出了区分粗细网格的假设与原则,给出了区分粗细网格在算法上实现的流程图。-problems against the finite difference uniform grid of the disadvantages of variable grid. and made a distinction between coarse and fine mesh assumptions and principles, is a distin