pEqnRhoSimpleC.H

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rho = thermo.rho();
 
volScalarField rAU(1.0 / UEqn.A());
volScalarField rAtU(1.0 / (1.0 / rAU - UEqn.H1()));
//***************** NOTE *******************
// constrainHbyA has been used since OpenFOAM-v1606; however, it may degrade the accuracy of derivatives
// because constraining variables will create discontinuity. Here we have a option to use the old
// implementation in OpenFOAM-3.0+ and before (no constraint for HbyA)
autoPtr<volVectorField> HbyAPtr = nullptr;
label useConstrainHbyA = daOptionPtr_->getOption<label>("useConstrainHbyA");
if (useConstrainHbyA)
{
    HbyAPtr.reset(new volVectorField(constrainHbyA(rAU * UEqn.H(), U, p)));
}
else
{
    HbyAPtr.reset(new volVectorField("HbyA", U));
    HbyAPtr() = rAU * UEqn.H();
}
volVectorField& HbyA = HbyAPtr();
 
tUEqn.clear();
 
bool closedVolume = false;
 
surfaceScalarField phiHbyA("phiHbyA", fvc::interpolate(rho) * fvc::flux(HbyA));
 
// NOTE: we don't support transonic = false
 
volScalarField rhorAtU("rhorAtU", rho* rAtU);
 
surfaceScalarField phid(
    "phid",
    (fvc::interpolate(psi) / fvc::interpolate(rho)) * phiHbyA);
 
phiHbyA +=
    fvc::interpolate(rho * (rAtU - rAU)) * fvc::snGrad(p) * mesh.magSf()
    - fvc::interpolate(psi * p) * phiHbyA / fvc::interpolate(rho);
 
HbyA -= (rAU - rAtU) * fvc::grad(p);
 
while (simple.correctNonOrthogonal())
{
    fvScalarMatrix pEqn(
        fvc::div(phiHbyA)
        + fvm::div(phid, p)
        - fvm::laplacian(rhorAtU, p));
 
    // Relax the pressure equation to maintain diagonal dominance
    pEqn.relax();
 
    pEqn.setReference(
        pressureControl.refCell(),
        pressureControl.refValue());
 
    // get the solver performance info such as initial
    // and final residuals
    SolverPerformance<scalar> solverP = pEqn.solve();
 
    DAUtility::primalResidualControl(solverP, printToScreen_, "p", daGlobalVarPtr_->primalMaxRes);
 
    if (simple.finalNonOrthogonalIter())
    {
        phi = phiHbyA + pEqn.flux();
    }
}
 
if (printToScreen_)
{
#include "continuityErrsPython.H"
}
 
// Explicitly relax pressure for momentum corrector
p.relax();
 
// bound p
DAUtility::boundVar(allOptions, p, printToScreen_);
 
U = HbyA - rAtU * fvc::grad(p);
// bound U
DAUtility::boundVar(allOptions, U, printToScreen_);
U.correctBoundaryConditions();
 
bool pLimited = pressureControl.limit(p);
 
// For closed-volume cases adjust the pressure and density levels
// to obey overall mass continuity
if (closedVolume)
{
    p += (initialMass_ - fvc::domainIntegrate(psi * p))
        / fvc::domainIntegrate(psi);
}
 
if (pLimited || closedVolume)
{
    p.correctBoundaryConditions();
}
 
rho = thermo.rho();
 
// bound rho
DAUtility::boundVar(allOptions, rho, printToScreen_);