foam-extend4.1-coherent-io/applications/solvers/heatTransfer/chtMultiRegionFoam/fluid/solveFluid.H

if (oCorr == 0)
{
    #include "rhoEqn.H"
}

#include "UEqn.H"

#include "hEqn.H"

// --- PISO loop
for (int corr=0; corr<nCorr; corr++)
{
    #include "pEqn.H"
}

turb.correct();

rho = thermo.rho();