pEqn.H

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// Solve pressure equation
volScalarField rAU(1.0 / UEqn.A());
volVectorField HbyA(constrainHbyA(rAU* UEqn.H(), U, p));
surfaceScalarField phiHbyA
(
    "phiHbyA",
    fvc::flux(HbyA)
    + fvc::interpolate(rAU) * fvc::ddtCorr(U, phi)
);
 
MRF.makeRelative(phiHbyA);
 
adjustPhi(phiHbyA, U, p);
 
// Update the pressure BCs to ensure flux consistency
constrainPressure(p, U, phiHbyA, rAU, MRF);
 
// Non-orthogonal pressure corrector loop
while (piso.correctNonOrthogonal())
{
    // Pressure corrector
    fvScalarMatrix pEqn
    (
        fvm::laplacian(rAU, p) == fvc::div(phiHbyA)
    );
    pEqn.setReference(pRefCell, pRefValue);
    pEqn.solve(mesh.solver(p.select(piso.finalInnerIter())));
 
    if (piso.finalNonOrthogonalIter())
    {
        phi = phiHbyA - pEqn.flux();
    }
}
 
#include "continuityErrs.H"
 
U = HbyA - rAU * fvc::grad(p);
U.correctBoundaryConditions();
fvOptions.correct(U);