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Momentum equation discretization in rhoSimpleFoam

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Old   October 16, 2007, 04:51
Default I've a question about the disc
Michele Vascellari
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I've a question about the discretization of the momentum equation in the solver rhoSimpleFoam, defined in this way:

fvm::div(phi, U)
- fvm::Sp(fvc::div(phi), U)
+ turbulence->divRhoR(U)

I don't understand the meaning of the second term fvm::Sp(fvc::div(phi),U).

The same equation in the solver rhoTurbFoam is discretized in a different way:

fvm::ddt(rho, U)
+ fvm::div(phi, U)
+ turbulence->divRhoR(U)

Someone can explain me the difference?

Thank you
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