- **OpenFOAM Running, Solving & CFD**
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- - **Momentum equation discretization in rhoSimpleFoam**
(*https://www.cfd-online.com/Forums/openfoam-solving/59380-momentum-equation-discretization-rhosimplefoam.html*)

I've a question about the discI'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 Michele |

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