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Fvmddt versus fvcddt

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Old   July 15, 2008, 09:42
Default Hello I am looking at the c
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I am looking at the code of rhoCentralFoam in ver1.5
Can someone tell me what the following expression means(just the ddt portion)?

solve (
fvm::ddt(rho, U) - fvc::ddt(rho,U)
- fvm::laplacian(mu, U)
- fvc::div(tauMC)
rhoU = rho*U;
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