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Added stickiness to dust model; also some cleaning up.

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This commit is contained in:
tlichtenegger
2019-09-09 11:42:45 +02:00
parent 9fb9e667db
commit a7f747a4ab
2 changed files with 116 additions and 53 deletions
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153
src/lagrangian/cfdemParticle/subModels/forceModel/Fines/FinesFields.C
View File

@ -47,11 +47,13 @@ FinesFields::FinesFields
verbose_(propsDict_.lookupOrDefault<bool>("verbose",false)),
clogKin_(propsDict_.lookupOrDefault<bool>("kineticClogging",false)),
clogStick_(propsDict_.lookupOrDefault<bool>("stickyClogging",false)),
movingBed_(propsDict_.lookupOrDefault<bool>("movingBed",true)),
fluxFieldName_(propsDict_.lookupOrDefault<word>("fluxFieldName","phi")),
phi_(sm.mesh().lookupObject<surfaceScalarField> (fluxFieldName_)),
velFieldName_(propsDict_.lookupOrDefault<word>("velFieldName","U")),
U_(sm.mesh().lookupObject<volVectorField> (velFieldName_)),
voidfractionFieldName_(propsDict_.lookupOrDefault<word>("voidfractionFieldName","voidfraction")),
// this is probably really bad
voidfraction_(const_cast<volScalarField&>(sm.mesh().lookupObject<volScalarField> (voidfractionFieldName_))),
voidfraction_(sm.mesh().lookupObject<volScalarField> (voidfractionFieldName_)),
UsFieldName_(propsDict_.lookupOrDefault<word>("granVelFieldName","Us")),
UsField_(sm.mesh().lookupObject<volVectorField> (UsFieldName_)),
pFieldName_(propsDict_.lookupOrDefault<word>("pFieldName","p")),
@ -202,7 +204,6 @@ FinesFields::FinesFields
),
sm.mesh(),
dimensionedScalar("zero", dimensionSet(1,0,-1,0,0), 0)
//dimensionedVector("zero", dimensionSet(1,-2,-1,0,0), vector::zero)
),
uDyn_
( IOobject
@ -221,8 +222,10 @@ FinesFields::FinesFields
rhoFine_("rhoFine",dimensionSet(1,-3,0,0,0),0.0),
g_("g",dimensionSet(0,1,-2,0,0),vector(0,0,-9.81)),
alphaDynMax_(0.1),
alphaMax_(readScalar(propsDict_.lookup ("alphaMax"))),
critVoidfraction_(readScalar(propsDict_.lookup ("critVoidfraction"))),
alphaMax_(propsDict_.lookupOrDefault<scalar>("alphaMax",0.95)),
alphaMinClog_(propsDict_.lookupOrDefault<scalar>("alphaMinClog",0.3)),
critVoidfraction_(propsDict_.lookupOrDefault<scalar>("critVoidfraction", 0.05)),
deltaT_(voidfraction_.mesh().time().deltaTValue()),
depositionLength_(readScalar(propsDict_.lookup ("depositionLength"))),
exponent_(-1.33),
nCrit_(0.0),
@ -281,26 +284,48 @@ FinesFields::FinesFields
if (clogStick_)
{
uBind_ = readScalar(propsDict_.lookup ("uBind"));
uReconstructed_.set
(
new volVectorField
(
IOobject
(
"uReconstructed",
sm.mesh().time().timeName(),
sm.mesh(),
IOobject::NO_READ,
IOobject::NO_WRITE
),
U_//sm.mesh()
)
);
}
if(verbose_)
if (verbose_)
{
alphaG_.writeOpt() = IOobject::AUTO_WRITE;
alphaG_.write();
alphaP_.writeOpt() = IOobject::AUTO_WRITE;
alphaP_.write();
deltaAlpha_.writeOpt() = IOobject::AUTO_WRITE;
deltaAlpha_.write();
dHydMix_.writeOpt() = IOobject::AUTO_WRITE;
dHydMix_.write();
DragCoeff_.writeOpt() = IOobject::AUTO_WRITE;
DragCoeff_.write();
dSauterMix_.writeOpt() = IOobject::AUTO_WRITE;
dSauterMix_.write();
FanningCoeff_.writeOpt() = IOobject::AUTO_WRITE;
FanningCoeff_.write();
Froude_.writeOpt() = IOobject::AUTO_WRITE;
Froude_.write();
alphaG_.writeOpt() = IOobject::AUTO_WRITE;
alphaG_.write();
alphaP_.writeOpt() = IOobject::AUTO_WRITE;
alphaP_.write();
deltaAlpha_.writeOpt() = IOobject::AUTO_WRITE;
deltaAlpha_.write();
dHydMix_.writeOpt() = IOobject::AUTO_WRITE;
dHydMix_.write();
DragCoeff_.writeOpt() = IOobject::AUTO_WRITE;
DragCoeff_.write();
dSauterMix_.writeOpt() = IOobject::AUTO_WRITE;
dSauterMix_.write();
FanningCoeff_.writeOpt() = IOobject::AUTO_WRITE;
FanningCoeff_.write();
Froude_.writeOpt() = IOobject::AUTO_WRITE;
Froude_.write();
if (clogStick_)
{
uReconstructed_().writeOpt() = IOobject::AUTO_WRITE;
uReconstructed_().write();
}
}
}
@ -315,33 +340,38 @@ FinesFields::~FinesFields()
void FinesFields::update()
{
if(verbose_) Info << "FinesFields: Updating alphaP.\n" << endl;
if (verbose_) Info << "FinesFields: Updating alphaP.\n" << endl;
updateAlphaP();
if(verbose_) Info << "FinesFields: Updating alphaG.\n" << endl;
if (verbose_) Info << "FinesFields: Updating alphaG.\n" << endl;
updateAlphaG();
if(verbose_) Info << "FinesFields: Calculating source terms.\n" << endl;
if (clogStick_)
{
if (verbose_) Info << "FinesFields: Updating uReconstructed.\n" << endl;
updateUReconstructed();
}
if (verbose_) Info << "FinesFields: Calculating source terms.\n" << endl;
calcSource();
if(verbose_) Info << "FinesFields: Updating dSauter.\n" << endl;
if (verbose_) Info << "FinesFields: Updating dSauter.\n" << endl;
updateDSauter();
if(verbose_) Info << "FinesFields: Updating dHydMix.\n" << endl;
if (verbose_) Info << "FinesFields: Updating dHydMix.\n" << endl;
updateDHydMix();
if(verbose_) Info << "FinesFields: Updating Froude.\n" << endl;
if (verbose_) Info << "FinesFields: Updating Froude.\n" << endl;
updateFroude();
if(verbose_) Info << "FinesFields: Updating FanningCoeff.\n" << endl;
if (verbose_) Info << "FinesFields: Updating FanningCoeff.\n" << endl;
updateFanningCoeff();
if(verbose_) Info << "FinesFields: Updating DragCoeff.\n" << endl;
if (verbose_) Info << "FinesFields: Updating DragCoeff.\n" << endl;
updateDragCoeff();
if(verbose_) Info << "FinesFields: Updating uDyn.\n" << endl;
if (verbose_) Info << "FinesFields: Updating uDyn.\n" << endl;
updateUDyn();
if(verbose_) Info << "FinesFields: Integrating alphas.\n" << endl;
if (verbose_) Info << "FinesFields: Integrating alphas.\n" << endl;
integrateFields();
if(verbose_) Info << "FinesFields: Update finished.\n" << endl;
if (verbose_) Info << "FinesFields: Update finished.\n" << endl;
}
void FinesFields::calcSource()
{
if(!clogKin_ & !clogStick_) return;
if (!clogKin_ & !clogStick_) return;
Sds_.primitiveFieldRef() = 0;
deltaAlpha_.primitiveFieldRef() = 0.0;
scalar fKin = 0.0;
@ -350,11 +380,14 @@ void FinesFields::calcSource()
scalar dmean = 0.0;
scalar d1 = 0.0;
scalar d2 = 0.0;
scalar magU = 0.0;
scalar tauDeposition = 0.0;
forAll(Sds_,cellI)
{
if(clogKin_)
fKin = 0.0;
fStick = 0.0;
if (clogKin_ && alphaP_[cellI] > alphaMinClog_) // no kinetic cloggig in dilute regions
{
// calculate everything in units auf dSauter
critpore = nCrit_*dFine_.value()/dSauter_[cellI];
@ -370,9 +403,11 @@ void FinesFields::calcSource()
else if (fKin > 1.0) fKin = 1.0;
}
if(clogStick_)
if (clogStick_)
{
fStick = 1.0 / ( 1.0 + mag(U_[cellI])/uBind_);
magU = mag(uReconstructed_()[cellI]); // use U reconstructed from phi to suppress oscillations at interfaces
fStick = 1.0 / ( 1.0 + magU/uBind_) * alphaP_[cellI] / 0.65;
if (fStick > 1.0) fStick = 1.0;
}
// at this point, voidfraction is still calculated from the true particle sizes
@ -386,7 +421,8 @@ void FinesFields::calcSource()
else
{
tauDeposition = depositionLength_ / max(mag(U_[cellI]),uMin_);
Sds_[cellI] = deltaAlpha_[cellI] / tauDeposition;
if (tauDeposition < 4.0*deltaT_) tauDeposition = 4.0*deltaT_; // do not deposit all dyn hold-up within less than 3 time steps
Sds_[cellI] = alphaDyn_[cellI] / tauDeposition;
}
}
}
@ -400,11 +436,12 @@ void FinesFields::integrateFields()
fvScalarMatrix alphaStEqn
(
fvm::ddt(alphaSt_)
+ fvm::div(phiSt,alphaSt_)
fvm::ddt(alphaSt_)
==
Sds_
);
if (movingBed_) alphaStEqn += fvm::div(phiSt,alphaSt_);
fvScalarMatrix alphaDynEqn
(
fvm::ddt(alphaDyn_)
@ -413,10 +450,11 @@ void FinesFields::integrateFields()
==
-Sds_
);
alphaStEqn.solve();
alphaDynEqn.solve();
if(smoothing_)
if (smoothing_)
particleCloud_.smoothingM().smoothen(alphaDyn_);
// limit hold-ups, should be done more elegantly
@ -475,7 +513,7 @@ void FinesFields::updateDHydMix()
forAll(dHydMix_,cellI)
{
scalar aPSt = alphaP_[cellI] + alphaSt_[cellI];
if(aPSt < SMALL || aPSt > 1 - SMALL)
if (aPSt < SMALL || aPSt > 1 - SMALL)
dHydMix_[cellI] = SMALL;
else
dHydMix_[cellI] = 2*(1 - aPSt) / (3*aPSt ) * dSauterMix_[cellI];
@ -495,11 +533,11 @@ void FinesFields::updateDragCoeff()
forAll(DragCoeff_,cellI)
{
Ref1 = Ref[cellI];
if(Ref1 <= SMALL)
if (Ref1 <= SMALL)
Cd = 24.0 / SMALL;
else if(Ref1 <= 1.0)
else if (Ref1 <= 1.0)
Cd = 24.0 / Ref1;
else if(Ref1 <= 1000)
else if (Ref1 <= 1000)
Cd = 24 * (1.0 + 0.15 * Foam::pow(Ref1,0.687) ) / Ref1;
else
Cd = 0.44;
@ -511,11 +549,11 @@ void FinesFields::updateDragCoeff()
forAll(DragCoeff_.boundaryField()[patchI], faceI)
{
Ref1 = Ref.boundaryField()[patchI][faceI];
if(Ref1 <= SMALL)
if (Ref1 <= SMALL)
Cd = 24.0 / SMALL;
else if(Ref1 <= 1.0)
else if (Ref1 <= 1.0)
Cd = 24.0 / Ref1;
else if(Ref1 <= 1000)
else if (Ref1 <= 1000)
Cd = 24 * (1.0 + 0.15 * Foam::pow(Ref1,0.687) ) / Ref1;
else
Cd = 0.44;
@ -532,9 +570,9 @@ void FinesFields::updateDSauter()
{
scalar aP = alphaP_[cellI];
scalar aSt = alphaSt_[cellI];
if(aSt < SMALL)
if (aSt < SMALL)
dSauterMix_[cellI] = dSauter_[cellI];
else if(aP < SMALL)
else if (aP < SMALL)
dSauterMix_[cellI] = dFine_.value();
else
dSauterMix_[cellI] = (aP + aSt) / (aP / dSauter_[cellI] + aSt / dFine_.value() );
@ -577,7 +615,7 @@ void FinesFields::updateUDyn()
{
scalar mU(mag(U_[cellI]));
scalar muDyn(mag(uDyn_[cellI]));
if(muDyn > mU && muDyn > SMALL)
if (muDyn > mU && muDyn > SMALL)
{
uDyn_[cellI] *= mU / muDyn;
}
@ -588,13 +626,24 @@ void FinesFields::updateUDyn()
{
scalar mU(mag(U_.boundaryField()[patchI][faceI]));
scalar muDyn(mag(uDyn_.boundaryField()[patchI][faceI]));
if(muDyn > mU && muDyn > SMALL)
if (muDyn > mU && muDyn > SMALL)
{
uDyn_.boundaryFieldRef()[patchI][faceI] *= mU / muDyn;
}
}
}
void FinesFields::updateUReconstructed()
{
if (phi_.dimensions() == dimensionSet(1, 0, -1, 0, 0)) // compressible
{
uReconstructed_() = fvc::reconstruct(phi_) / (rhoG_ * voidfraction_);
}
else
{
uReconstructed_() = fvc::reconstruct(phi_) / voidfraction_;
}
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
} // End namespace Foam

16
src/lagrangian/cfdemParticle/subModels/forceModel/Fines/FinesFields.H
View File

@ -50,13 +50,19 @@ private:
bool clogStick_;
bool movingBed_;
word fluxFieldName_;
const surfaceScalarField& phi_;
word velFieldName_;
const volVectorField& U_;
word voidfractionFieldName_;
volScalarField& voidfraction_;
const volScalarField& voidfraction_;
word UsFieldName_;
@ -98,6 +104,8 @@ private:
volVectorField uDyn_;
autoPtr<volVectorField> uReconstructed_; // velocity field can show oscillations at porosity steps
dimensionedScalar dFine_;
dimensionedScalar diffCoeff_;
@ -112,8 +120,12 @@ private:
scalar alphaMax_;
scalar alphaMinClog_;
scalar critVoidfraction_;
scalar deltaT_;
scalar depositionLength_;
scalar exponent_;
@ -152,6 +164,8 @@ private:
void updateUDyn();
void updateUReconstructed();
public:
//- Runtime type information