pEqn.H

{
    if (correctPhi)
    {
        rAU.ref() = 1.0/UEqn.A();
    }
    else
    {
        rAU = 1.0/UEqn.A();
    }

    surfaceScalarField rAUf("rAUf", fvc::interpolate(rAU()));

    volVectorField HbyA("HbyA", U);
    HbyA = rAU()*UEqn.H();

    surfaceScalarField phiHbyA
    (
        "phiHbyA",
        (fvc::interpolate(HbyA) & mesh.Sf())
      + fvc::interpolate(rho*rAU())*fvc::ddtCorr(U, phi)
    );

    if (p_rgh.needReference())
    {
        fvc::makeRelative(phiHbyA, U);
        adjustPhi(phiHbyA, U, p_rgh);
        fvc::makeAbsolute(phiHbyA, U);
    }

    #include "fvcFlux.H"
    surfaceScalarField phig
    (
        (
          - ghf*fvc::snGrad(rho) * mesh.magSf()
          + fvc::flux(fluid.divCapillaryStress())
        )
        *rAUf
    );

    phiHbyA += phig;

    // Update the fixedFluxPressure BCs to ensure flux consistency
    constrainPressure(p_rgh, U, phiHbyA, rAUf);

    while (pimple.correctNonOrthogonal())
    {

        fvScalarMatrix p_rghEqn
        (
            fvc::div(phiHbyA)
          - fvm::laplacian(rAUf, p_rgh)
        );

        if (fluid.includeVolChange())
        {
            p_rghEqn += fluid.volTransfer(p_rgh);
        }

        p_rghEqn.setReference(pRefCell, pRefValue);

        p_rghEqn.solve(mesh.solver(p_rgh.select(pimple.finalInnerIter())));

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

            p_rgh.relax();

            U = HbyA + rAU()*fvc::reconstruct((phig + p_rghEqn.flux())/rAUf);

            U.correctBoundaryConditions();
            fvOptions.correct(U);
            K = 0.5*magSqr(U);
        }
    }

    #include "continuityErrs.H"

    // Correct Uf if the mesh is moving
    fvc::correctUf(Uf, U, phi);

    // Make the fluxes relative to the mesh motion
    fvc::makeRelative(phi, U);

    p == p_rgh + rho*gh;

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

    if (!correctPhi)
    {
        rAU.clear();
    }
}