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有点疑惑，请问 Initial residual , Final residual 的定义是什么？是残差的绝对值还是相对值？ 另外，residual是怎样用来度量动量方程的满足情况的？谢谢！
https://www.cfd-online.com/Forums/openfoam-solving/117484-initial-residual-final-residual.html
@cccrrryyy 多谢！ 请问，在这个公式中，x和x0分别表示什么呢？
@cccrrryyy
公式链接：OpenFOAM的残差定义： https://chengdi123000.github.io/2018/01/05/OpenFOAM的残差定义/
不太清楚，可能需要去看一下代码了。
