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foam-extend4.1-coherent-io/applications/solvers/incompressible/pimpleFoam/UEqn.H

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// Convection-diffusion matrix
fvVectorMatrix HUEqn
(
fvm::div(phi, U)
+ turbulence->divDevReff()
);
// Time derivative matrix
fvVectorMatrix ddtUEqn(fvm::ddt(U));
// Get under-relaxation factor
scalar UUrf =
mesh.solutionDict().equationRelaxationFactor(U.select(pimple.finalIter()));
if (pimple.momentumPredictor())
{
// Solve momentum predictor
solve
(
ddtUEqn
+ relax(HUEqn, UUrf)
==
- fvc::grad(p),
mesh.solutionDict().solver((U.select(pimple.finalIter())))
);
}
else
{
U = (ddtUEqn.H() + HUEqn.H() - fvc::grad(p))/(HUEqn.A() + ddtUEqn.A());
U.correctBoundaryConditions();
}