pEqn.H

 
if (!pimple.SIMPLErho())
{
    rho = thermo.rho();
}
 
// Thermodynamic density needs to be updated by psi*d(p) after the
// pressure solution
const volScalarField psip0(psi*p);
 
volScalarField rAU(1.0 / UEqn.A());
surfaceScalarField rhorAUf("rhorAUf", fvc::interpolate(rho*rAU));
volVectorField HbyA(constrainHbyA(rAU*UEqn.H(), U, p));
 
if (pimple.nCorrPISO() <= 1)
{
    tUEqn.clear();
}
 
surfaceScalarField phiHbyA
(
    "phiHbyA",
    fvc::interpolate(rho)*fvc::flux(HbyA)
    + MRF.zeroFilter(rhorAUf * fvc::ddtCorr(rho, U, phi, rhoUf))
);
 
fvc::makeRelative(phiHbyA, rho, U);
MRF.makeRelative(fvc::interpolate(rho), phiHbyA);
 
// Update the pressure BCs to ensure flux consistency
constrainPressure(p, rho, U, phiHbyA, rhorAUf, MRF);
 
if (pimple.transonic())
{
    surfaceScalarField phid
    (
        "phid",
        (fvc::interpolate(psi) / fvc::interpolate(rho))*phiHbyA
    );
    phiHbyA -= fvc::interpolate(psi * p) * phiHbyA / fvc::interpolate(rho);
    fvScalarMatrix pDDtEqn
    (
        fvc::ddt(rho)
        + psi * correction(fvm::ddt(p))
        + fvc::div(phiHbyA)
        + fvm::div(phid, p)
        ==
        fvOptions(psi, p, rho.name())
    );
 
    while (pimple.correctNonOrthogonal())
    {
        fvScalarMatrix pEqn
        (
            pDDtEqn
            - fvm::laplacian(rhorAUf, p)
        );
        // Relax the pressure equation to ensure diagonal-dominance
        pEqn.relax();
        pEqn.solve(mesh.solver(p.select(pimple.finalInnerIter())));
 
        if (pimple.finalNonOrthogonalIter())
        {
            phi = phiHbyA + pEqn.flux();
        }
    }
}
else
{
    fvScalarMatrix pDDtEqn
    (
        fvc::ddt(rho) + psi * correction(fvm::ddt(p))
        + fvc::div(phiHbyA)
        ==
        fvOptions(psi, p, rho.name())
    );
 
    while (pimple.correctNonOrthogonal())
    {
        fvScalarMatrix pEqn(pDDtEqn - fvm::laplacian(rhorAUf, p));
        pEqn.solve(mesh.solver(p.select(pimple.finalInnerIter())));
 
        if (pimple.finalNonOrthogonalIter())
        {
            phi = phiHbyA + pEqn.flux();
        }
    }
}
 
 
// Explicitly relax pressure for momentum corrector
p.relax();
 
U = HbyA - rAU * fvc::grad(p);
U.correctBoundaryConditions();
fvOptions.correct(U);
K = 0.5 * magSqr(U);
 
if (pressureControl.limit(p))
{
    p.correctBoundaryConditions();
}
 
thermo.correctRho(psi * p - psip0, rhoMin, rhoMax) ;
 
#include "rhoEqn.H"
#include "compressibleContinuityErrs.H"
 
rho = thermo.rho();
 
// Correct rhoUf if the mesh is moving
fvc::correctRhoUf(rhoUf, rho, U, phi);
 
if (thermo.dpdt())
{
    dpdt = fvc::ddt(p);
 
    if (mesh.moving())
    {
        dpdt -= fvc::div(fvc::meshPhi(rho, U), p);
    }
}