In order to remove the shortcomings of equal and uniform mesh and to replale arc angles of rectangular billet by right angle in conventional FDM,changeable space FDM is described in this peper.

• 针对用传统有限差分法模拟计算矩形连铸坯凝固传热时在整个计算区域上离散网格大小需均匀一致且要用直角来代替铸坯圆角这一缺点,提出了变间距有限差分法。