UEqnSimpleT.H

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// Momentum predictor
 
MRF.correctBoundaryVelocity(U);
 
if (hasFvSource_)
{
    daFvSourcePtr_->calcFvSource(fvSource);
}
 
tmp<fvVectorMatrix> tUEqn(
    fvm::div(phi, U)
    + fvm::Sp(alphaPorosity, U)
    + MRF.DDt(U)
    + turbulencePtr_->divDevReff(U)
    - fvSource
    - fvOptions(U));
fvVectorMatrix& UEqn = tUEqn.ref();
 
UEqn.relax();
 
if (simple.momentumPredictor())
{
    // get the solver performance info such as initial
    // and final residuals
    SolverPerformance<vector> solverU = solve(UEqn == -fvc::grad(p));
 
    this->primalResidualControl<vector>(solverU, printToScreen, printInterval, "U");
 
    fvOptions.correct(U);
}