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A problem in icoFoam?

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Old   March 24, 2017, 09:39
Default A problem in icoFoam?
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I read the source codes of icoFoam and pisoFoam. The codes in lines 108~113 of icoFoam is shown as following:
surfaceScalarField phiHbyA
(
"phiHbyA",
fvc::flux(HbyA)
+fvc::interpolate(rAU)*fvc::ddtCorr(U,phi)
);

I do not understand what the operator "ddtCorr(U,phi)" means and what is the expression or equation corresponding to this operator?
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