pEqn.H

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rho = thermo.rho();
rho.clamp_range(rhoMin, rhoMax);
rho.relax();
 
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();
}
 
if (pimple.transonic())
{
    surfaceScalarField phid
    (
        "phid",
        fvc::interpolate(psi)
       *(
            fvc::flux(HbyA)
          + MRF.zeroFilter
            (
                rhorAUf*fvc::ddtCorr(rho, U, phi)/fvc::interpolate(rho)
            )
        )
    );
 
    MRF.makeRelative(fvc::interpolate(psi), phid);
 
    while (pimple.correctNonOrthogonal())
    {
        fvScalarMatrix pEqn
        (
            fvm::ddt(psi, p)
          + fvm::div(phid, p)
          - fvm::laplacian(rhorAUf, p)
         ==
            parcels.Srho()
          + fvOptions(psi, p, rho.name())
        );
 
        pEqn.solve(p.select(pimple.finalInnerIter()));
 
        if (pimple.finalNonOrthogonalIter())
        {
            phi == pEqn.flux();
        }
    }
}
else
{
    surfaceScalarField phiHbyA
    (
        "phiHbyA",
        (
            fvc::flux(rho*HbyA)
          + rhorAUf*fvc::ddtCorr(rho, U, phi)
        )
    );
 
    MRF.makeRelative(fvc::interpolate(rho), phiHbyA);
 
    // Update the pressure BCs to ensure flux consistency
    constrainPressure(p, rho, U, phiHbyA, rhorAUf, MRF);
 
    while (pimple.correctNonOrthogonal())
    {
        fvScalarMatrix pEqn
        (
            fvm::ddt(psi, p)
          + fvc::div(phiHbyA)
          - fvm::laplacian(rhorAUf, p)
         ==
            parcels.Srho()
          + fvOptions(psi, p, rho.name())
        );
 
        pEqn.solve(p.select(pimple.finalInnerIter()));
 
        if (pimple.finalNonOrthogonalIter())
        {
            phi = phiHbyA + pEqn.flux();
        }
    }
}
 
#include "rhoEqn.H"
#include "compressibleContinuityErrs.H"
 
// Explicitly relax pressure for momentum corrector
p.relax();
 
// Recalculate density from the relaxed pressure
rho = thermo.rho();
rho.clamp_range(rhoMin, rhoMax);
rho.relax();
Info<< "rho min/max : " << min(rho).value() << " " << max(rho).value() << endl;
 
U = HbyA - rAU*fvc::grad(p);
U.correctBoundaryConditions();
fvOptions.correct(U);
K = 0.5*magSqr(U);
 
if (thermo.dpdt())
{
    dpdt = fvc::ddt(p);
}