compressibilityEqns.C

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#include "multiphaseEuler.H"
#include "fvcDdt.H"
#include "fvcDiv.H"
#include "fvcSup.H"
#include "fvmDdt.H"
#include "fvmDiv.H"
#include "fvmSup.H"
 
// * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * * //
 
Foam::PtrList<Foam::fvScalarMatrix>
Foam::solvers::multiphaseEuler::compressibilityEqns
(
    const PtrList<volScalarField>& dmdts,
    const PtrList<volScalarField>& d2mdtdps
) const
{
    PtrList<fvScalarMatrix> pEqnComps(phases.size());
 
    forAll(phases_, phasei)
    {
        phaseModel& phase = phases_[phasei];
        const volScalarField& alpha = phase;
        volScalarField& rho = phase.rho();
 
        pEqnComps.set(phasei, new fvScalarMatrix(p_rgh, dimVolume/dimTime));
        fvScalarMatrix& pEqnComp = pEqnComps[phasei];
 
        // Density variation
        if (!phase.isochoric() || !phase.pure())
        {
            pEqnComp +=
                (
                    fvc::ddt(alpha, rho) + fvc::div(phase.alphaRhoPhi())
                  - fvc::Sp(fvc::ddt(alpha) + fvc::div(phase.alphaPhi()), rho)
                )/rho;
        }
 
        // Mesh dilatation correction
        if (mesh.moving())
        {
            pEqnComp += fvc::div(mesh.phi())*alpha;
        }
 
        // Compressibility
        if (!phase.incompressible())
        {
            if (pimple.transonic())
            {
                const surfaceScalarField phid
                (
                    IOobject::groupName("phid", phase.name()),
                    fvc::interpolate(phase.thermo().psi())*phase.phi()
                );
 
                pEqnComp +=
                    correction
                    (
                        (alpha/rho)*
                        (
                            phase.thermo().psi()*fvm::ddt(p_rgh)
                          + fvm::div(phid, p_rgh)
                          - fvm::Sp(fvc::div(phid), p_rgh)
                        )
                    );
 
                pEqnComps[phasei].relax();
            }
            else
            {
                pEqnComp +=
                    (alpha*phase.thermo().psi()/rho)
                   *correction(fvm::ddt(p_rgh));
            }
        }
 
        // Option sources
        if (fvModels().addsSupToField(rho.name()))
        {
            pEqnComp -= (fvModels().source(alpha, rho) & rho)/rho;
        }
 
        // Mass transfer
        if (dmdts.set(phasei))
        {
            pEqnComp -= dmdts[phasei]/rho;
        }
        if (d2mdtdps.set(phasei))
        {
            pEqnComp -= correction(fvm::Sp(d2mdtdps[phasei]/rho, p_rgh));
        }
    }
 
    return pEqnComps;
}
 
 
// ************************************************************************* //