pEqn.H

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{
    volScalarField rAU("rAU", 1.0/UEqn.A());
    surfaceScalarField rhorAUf("rhorAUf", fvc::interpolate(rho*rAU));
    volVectorField HbyA(constrainHbyA(rAU*UEqn.H(), U, p_rgh));
    tUEqn.clear();
 
    surfaceScalarField phig(-rhorAUf*ghf*fvc::snGrad(rho)*mesh.magSf());
 
    surfaceScalarField phiHbyA
    (
        "phiHbyA",
        fvc::flux(rho*HbyA)
    );
 
    MRF.makeRelative(fvc::interpolate(rho), phiHbyA);
 
    bool closedVolume = adjustPhi(phiHbyA, U, p_rgh);
 
    phiHbyA += phig;
 
    // Update the pressure BCs to ensure flux consistency
    constrainPressure(p_rgh, rho, U, phiHbyA, rhorAUf, MRF);
 
    dimensionedScalar compressibility = fvc::domainIntegrate(psi);
    bool compressible = (compressibility.value() > SMALL);
 
    while (simple.correctNonOrthogonal())
    {
        fvScalarMatrix p_rghEqn
        (
            fvm::laplacian(rhorAUf, p_rgh) == fvc::div(phiHbyA)
        );
 
        p_rghEqn.setReference(pRefCell, getRefCellValue(p_rgh, pRefCell));
 
        p_rghEqn.solve();
 
        if (simple.finalNonOrthogonalIter())
        {
            // Calculate the conservative fluxes
            phi = phiHbyA - p_rghEqn.flux();
 
            // Explicitly relax pressure for momentum corrector
            p_rgh.relax();
 
            // Correct the momentum source with the pressure gradient flux
            // calculated from the relaxed pressure
            U = HbyA + rAU*fvc::reconstruct((phig - p_rghEqn.flux())/rhorAUf);
            U.correctBoundaryConditions();
            fvOptions.correct(U);
        }
    }
 
    p = p_rgh + rho*gh;
 
    #include "continuityErrs.H"
 
    // For closed-volume cases adjust the pressure level
    // to obey overall mass continuity
    if (closedVolume)
    {
        if(!compressible)
        {
            p += dimensionedScalar
            (
                "p",
                p.dimensions(),
                pRefValue - getRefCellValue(p, pRefCell)
            );
        }
        else
        {
            p += (initialMass - fvc::domainIntegrate(psi*p))
                /fvc::domainIntegrate(psi);
 
        }
        p_rgh = p - rho*gh;
    }
 
    rho = thermo.rho();
    rho.relax();
    Info<< "rho min/max : " << min(rho).value() << " " << max(rho).value()
        << endl;
}