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上方程应该对应： 那加重的哪一行表示？ 如果完全按照第一张图来写，写出来应该是： 化简的话应该是这样？ 这种写法是否对呢？（不可压缩流体下）对流项可以这么解决？
https://www.cfd-online.com/Forums/openfoam/76331-understanding-fvm-sp.html
https://www.cfd-online.com/Forums/openfoam/81749-fvm-sp-b.html
这可能是大型稀疏矩阵求解的技巧
