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interFoam/alphaEqn: Corrected handling of the off-centreing coefficient for Crank-Nicolson

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This commit is contained in:
Henry
2015-02-22 12:13:19 +00:00
parent 87cfd5788b
commit 44ad48906b
1 changed files with 5 additions and 24 deletions
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27
applications/solvers/multiphase/interFoam/alphaEqn.H
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@ -41,7 +41,7 @@
<< exit(FatalError); << exit(FatalError);
} }
scalar cnCoeff = ocCoeff/2.0; scalar cnCoeff = 1.0/(1.0 + ocCoeff);
// Standard face-flux compression coefficient // Standard face-flux compression coefficient
surfaceScalarField phic(mixture.cAlpha()*mag(phi/mesh.magSf())); surfaceScalarField phic(mixture.cAlpha()*mag(phi/mesh.magSf()));
@ -70,7 +70,7 @@
// Calculate the Crank-Nicolson off-centred volumetric flux // Calculate the Crank-Nicolson off-centred volumetric flux
if (ocCoeff > 0) if (ocCoeff > 0)
{ {
phiCN = (1.0 - cnCoeff)*phi + cnCoeff*phi.oldTime(); phiCN = cnCoeff*phi + (1.0 - cnCoeff)*phi.oldTime();
} }
if (MULESCorr) if (MULESCorr)
@ -146,8 +146,7 @@
if (ocCoeff > 0) if (ocCoeff > 0)
{ {
tphiAlphaUn = tphiAlphaUn =
(1.0 - cnCoeff)*tphiAlphaUn cnCoeff*tphiAlphaUn + (1.0 - cnCoeff)*phiAlpha.oldTime();
+ cnCoeff*phiAlpha.oldTime();
} }
if (MULESCorr) if (MULESCorr)
@ -199,32 +198,14 @@
== fv::EulerDdtScheme<vector>::typeName == fv::EulerDdtScheme<vector>::typeName
) )
{ {
if (ocCoeff > 0)
{
// Calculate the Crank-Nicolson off-centred volumetric flux
surfaceScalarField phiCN
(
"phiCN",
(1.0 - cnCoeff)*phi + cnCoeff*phi.oldTime()
);
Info<< "Calculate the Crank-Nicolson off-centred mass flux" << endl;
// Calculate the Crank-Nicolson off-centred mass flux
rhoPhi = phiAlpha*(rho1 - rho2) + phiCN*rho2; rhoPhi = phiAlpha*(rho1 - rho2) + phiCN*rho2;
} }
else else
{
// Calculate the end-of-time-step mass flux
rhoPhi = phiAlpha*(rho1 - rho2) + phi*rho2;
}
}
else
{ {
if (ocCoeff > 0) if (ocCoeff > 0)
{ {
Info<< "Calculate the end-of-time-step alpha flux" << endl;
// Calculate the end-of-time-step alpha flux // Calculate the end-of-time-step alpha flux
phiAlpha = (phiAlpha - cnCoeff*phiAlpha.oldTime())/(1.0 - cnCoeff); phiAlpha = (phiAlpha - (1.0 - cnCoeff)*phiAlpha.oldTime())/cnCoeff;
} }
// Calculate the end-of-time-step mass flux // Calculate the end-of-time-step mass flux