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适体网格: 在笛卡尔网格中,网格线和笛卡尔坐标系统平行。然而这种严格的限定导致笛卡尔网格仅能用与非常特殊的情况。适体网格不再依附这种严格的限定,其网格线方向任意。目前大部分的结构网格均属于适体网格。在有限差分法中,使用适体网格需要进行坐标变换。