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ddtCorr这个是个老梗了，一直没时间深究，不过今天发现在某些算例下，区别很大
ddtCorr
fvc::flux(HbyA) + fvc::interpolate(rho*rAU)*fvc::ddtCorr(U, Uf)
其中第二行加与不加的效果如下，左侧是不加，右侧是加
用了两年OpenFOAM了，感觉至今感觉还没太看懂icoFoam中的东西，慌得一批
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