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Extra term in the Xoodle solver for Psi

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Old   April 4, 2008, 07:11
Default Hi there, I am following the
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Sergio Ferraris
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Hi there,
I am following the equation for Psi for turbulent deflagration. It looks as:

fvm::ddt(rho, Xi)
+ fvm::div(phi + phiXi, Xi, "div(phiXi,Xi)")
- fvm::Sp(fvc::div(phiXi), Xi)
- fvm::Sp(rho*(R - G), Xi)
- fvm::Sp
sigmat - sigmas,
dimensionedScalar("0", sigmat.dimensions(), 0)

I quiet understand all the terms but:

-fvm::Sp(fvc::div(phiXi), Xi)

This term is div(phiXi,Xi) but it is already included in fvm::div(phi + phiXi, Xi, "div(phiXi,Xi)")

and is after substracted?. There is something not clear to me about how this term is included in the equation.


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