pEqn.H

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{
    volScalarField rAU("rAU", 1.0/UEqn.A());
    surfaceScalarField rAUf("rAUf", fvc::interpolate(rAU));
    volVectorField HbyA(constrainHbyA(rAU*UEqn.H(), U, p_rgh));
    surfaceScalarField phiHbyA
    (
        "phiHbyA",
        fvc::flux(HbyA)
      + mixture.MRF().zeroFilter(fvc::interpolate(rho*rAU)*fvc::ddtCorr(U, phi))
    );
    mixture.MRF().makeRelative(phiHbyA);
    adjustPhi(phiHbyA, U, p_rgh);

    surfaceScalarField phig
    (
        (
          - ghf*fvc::snGrad(rho)
        )*rAUf*mesh.magSf()
    );

    phiHbyA += phig;

    // Update the pressure BCs to ensure flux consistency
    constrainPressure(p_rgh, U, phiHbyA, rAUf, mixture.MRF());

    while (pimple.correctNonOrthogonal())
    {
        fvScalarMatrix p_rghEqn
        (
            fvm::laplacian(rAUf, p_rgh) == fvc::div(phiHbyA)
        );

        p_rghEqn.setReference
        (
            pressureReference.refCell(),
            getRefCellValue(p_rgh, pressureReference.refCell())
        );

        p_rghEqn.solve();

        if (pimple.finalNonOrthogonalIter())
        {
            phi = phiHbyA - p_rghEqn.flux();

            p_rgh.relax();

            U = HbyA + rAU*fvc::reconstruct((phig - p_rghEqn.flux())/rAUf);
            U.correctBoundaryConditions();
            fvConstraints.constrain(U);
        }
    }

    #include "continuityErrs.H"

    p == p_rgh + rho*gh;

    if (p_rgh.needReference())
    {
        p += dimensionedScalar
        (
            "p",
            p.dimensions(),
            pressureReference.refValue()
          - getRefCellValue(p, pressureReference.refCell())
        );
        p_rgh = p - rho*gh;
    }
}