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compressibleInterFoam: Improved mass conservation

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using the continuity error correction formulation developed for
twoPhaseEulerFoam and reactingEulerFoam.
This commit is contained in:
Henry Weller
2017-06-22 14:42:36 +01:00
committed by Andrew Heather
parent 092d4f4f0b
commit 3df71d18d0
18 changed files with 171 additions and 81 deletions
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49
applications/solvers/multiphase/VoF/alphaEqn.H
View File

@ -113,6 +113,8 @@
phiCN,
upwind<scalar>(mesh, phiCN)
).fvmDiv(phiCN, alpha1)
// - fvm::Sp(fvc::ddt(dimensionedScalar("1", dimless, 1), mesh)
// + fvc::div(phiCN), alpha1)
==
Su + fvm::Sp(Sp + divU, alpha1)
);
@ -125,19 +127,19 @@
<< " Max(" << alpha1.name() << ") = " << max(alpha1).value()
<< endl;
tmp<surfaceScalarField> talphaPhiUD(alpha1Eqn.flux());
alphaPhi = talphaPhiUD();
tmp<surfaceScalarField> talphaPhi1UD(alpha1Eqn.flux());
alphaPhi10 = talphaPhi1UD();
if (alphaApplyPrevCorr && talphaPhiCorr0.valid())
if (alphaApplyPrevCorr && talphaPhi1Corr0.valid())
{
Info<< "Applying the previous iteration compression flux" << endl;
MULES::correct(alpha1, alphaPhi, talphaPhiCorr0.ref(), 1, 0);
MULES::correct(alpha1, alphaPhi10, talphaPhi1Corr0.ref(), 1, 0);
alphaPhi += talphaPhiCorr0();
alphaPhi10 += talphaPhi1Corr0();
}
// Cache the upwind-flux
talphaPhiCorr0 = talphaPhiUD;
talphaPhi1Corr0 = talphaPhi1UD;
alpha2 = 1.0 - alpha1;
@ -151,7 +153,7 @@
surfaceScalarField phir(phic*mixture.nHatf());
tmp<surfaceScalarField> talphaPhiUn
tmp<surfaceScalarField> talphaPhi1Un
(
fvc::flux
(
@ -169,15 +171,15 @@
if (MULESCorr)
{
tmp<surfaceScalarField> talphaPhiCorr(talphaPhiUn() - alphaPhi);
tmp<surfaceScalarField> talphaPhi1Corr(talphaPhi1Un() - alphaPhi10);
volScalarField alpha10("alpha10", alpha1);
MULES::correct
(
geometricOneField(),
alpha1,
talphaPhiUn(),
talphaPhiCorr.ref(),
talphaPhi1Un(),
talphaPhi1Corr.ref(),
Sp,
(-Sp*alpha1)(),
1,
@ -187,24 +189,24 @@
// Under-relax the correction for all but the 1st corrector
if (aCorr == 0)
{
alphaPhi += talphaPhiCorr();
alphaPhi10 += talphaPhi1Corr();
}
else
{
alpha1 = 0.5*alpha1 + 0.5*alpha10;
alphaPhi += 0.5*talphaPhiCorr();
alphaPhi10 += 0.5*talphaPhi1Corr();
}
}
else
{
alphaPhi = talphaPhiUn;
alphaPhi10 = talphaPhi1Un;
MULES::explicitSolve
(
geometricOneField(),
alpha1,
phiCN,
alphaPhi,
alphaPhi10,
Sp,
(Su + divU*min(alpha1(), scalar(1)))(),
1,
@ -219,34 +221,37 @@
if (alphaApplyPrevCorr && MULESCorr)
{
talphaPhiCorr0 = alphaPhi - talphaPhiCorr0;
talphaPhiCorr0.ref().rename("alphaPhiCorr0");
talphaPhi1Corr0 = alphaPhi10 - talphaPhi1Corr0;
talphaPhi1Corr0.ref().rename("alphaPhi1Corr0");
}
else
{
talphaPhiCorr0.clear();
talphaPhi1Corr0.clear();
}
#include "rhofs.H"
if
(
word(mesh.ddtScheme("ddt(rho,U)"))
== fv::EulerDdtScheme<vector>::typeName
|| word(mesh.ddtScheme("ddt(rho,U)"))
== fv::localEulerDdtScheme<vector>::typeName
)
{
#include "rhofs.H"
rhoPhi = alphaPhi*(rho1f - rho2f) + phiCN*rho2f;
rhoPhi = alphaPhi10*(rho1f - rho2f) + phiCN*rho2f;
}
else
{
if (ocCoeff > 0)
{
// Calculate the end-of-time-step alpha flux
alphaPhi = (alphaPhi - (1.0 - cnCoeff)*alphaPhi.oldTime())/cnCoeff;
alphaPhi10 =
(alphaPhi10 - (1.0 - cnCoeff)*alphaPhi10.oldTime())/cnCoeff;
}
// Calculate the end-of-time-step mass flux
#include "rhofs.H"
rhoPhi = alphaPhi*(rho1f - rho2f) + phi*rho2f;
rhoPhi = alphaPhi10*(rho1f - rho2f) + phi*rho2f;
}
Info<< "Phase-1 volume fraction = "

13
applications/solvers/multiphase/VoF/createAlphaFluxes.H
View File

@ -1,20 +1,21 @@
IOobject alphaPhiHeader
IOobject alphaPhi10Header
(
"alphaPhi",
"alphaPhi10",
runTime.timeName(),
mesh,
IOobject::READ_IF_PRESENT,
IOobject::AUTO_WRITE
);
const bool alphaRestart = alphaPhiHeader.typeHeaderOk<surfaceScalarField>(true);
const bool alphaRestart =
alphaPhi10Header.typeHeaderOk<surfaceScalarField>(true);
// MULES flux from previous time-step
surfaceScalarField alphaPhi
surfaceScalarField alphaPhi10
(
alphaPhiHeader,
alphaPhi10Header,
phi*fvc::interpolate(alpha1)
);
// MULES Correction
tmp<surfaceScalarField> talphaPhiCorr0;
tmp<surfaceScalarField> talphaPhi1Corr0;