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中心差分格式是一个二阶的用于评估面变量的插值格式。在中心差分格式中,面上的变量值和速度的方向无关。以速度举例,在上图中,面$p$上的$\bfU_p=\frac{1}{2}\left(\bfU_\rP+\bfU_\rE\right)$。使用中心差分格式需要满足Pe数小于2。