OpenFOAM-4.x/applications/solvers/heatTransfer/chtMultiRegionFoam/chtMultiRegionSimpleFoam/fluid/solveFluid.H

//  Pressure-velocity SIMPLE corrector

    {
        if (frozenFlow)
        {
            #include "EEqn.H"
        }
        else
        {
            p_rgh.storePrevIter();
            rho.storePrevIter();

            #include "UEqn.H"
            #include "EEqn.H"
            #include "pEqn.H"

            turb.correct();
        }
    }