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laminarModels::lambdaThixotropic: Reformulated lambda equation in conservative form

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to support standard fvModel sources.
This commit is contained in:
Henry Weller
2024-02-29 15:40:39 +00:00
parent 4bbcf7eead
commit 55410bedf5
2 changed files with 34 additions and 9 deletions
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35
src/MomentumTransportModels/momentumTransportModels/laminar/lambdaThixotropic/lambdaThixotropic.C
View File

@ -2,7 +2,7 @@
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2020-2023 OpenFOAM Foundation
\\ / A nd | Copyright (C) 2020-2024 OpenFOAM Foundation
\\/ M anipulation |
-------------------------------------------------------------------------------
License
@ -75,7 +75,16 @@ lambdaThixotropic<BasicMomentumTransportModel>::lambdaThixotropic
? dimensionedScalar("sigmay", dimPressure/dimDensity, this->coeffDict_)
: dimensionedScalar("sigmay", dimPressure/dimDensity, 0)
),
residualAlpha_
(
dimensioned<scalar>::lookupOrAddToDict
(
"residualAlpha",
this->coeffDict_,
dimless,
1e-6
)
),
lambda_
(
IOobject
@ -210,7 +219,9 @@ template<class BasicMomentumTransportModel>
void lambdaThixotropic<BasicMomentumTransportModel>::correct()
{
// Local references
const surfaceScalarField& phi = this->phi_;
const alphaField& alpha = this->alpha_;
const rhoField& rho = this->rho_;
const surfaceScalarField& alphaRhoPhi = this->alphaRhoPhi_;
const Foam::fvModels& fvModels(Foam::fvModels::New(this->mesh_));
const Foam::fvConstraints& fvConstraints
(
@ -221,12 +232,20 @@ void lambdaThixotropic<BasicMomentumTransportModel>::correct()
tmp<fvScalarMatrix> lambdaEqn
(
fvm::ddt(lambda_) + fvm::div(phi, lambda_)
- fvm::Sp(fvc::div(phi), lambda_)
fvm::ddt(alpha, rho, lambda_)
+ fvm::div(alphaRhoPhi, lambda_)
==
a_*pow(1 - lambda_(), b_)
- fvm::Sp(c_*pow(strainRate(), d_), lambda_)
+ fvModels.source(lambda_)
alpha()*rho()*a_*pow(1 - lambda_(), b_)
- fvm::Sp
(
rho()
*(
alpha()*c_*pow(strainRate(), d_)
+ max(residualAlpha_ - alpha(), dimensionedScalar(dimless, 0))*a_
),
lambda_
)
+ fvModels.source(alpha, rho, lambda_)
);
lambdaEqn.ref().relax();

8
src/MomentumTransportModels/momentumTransportModels/laminar/lambdaThixotropic/lambdaThixotropic.H
View File

@ -2,7 +2,7 @@
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2020-2023 OpenFOAM Foundation
\\ / A nd | Copyright (C) 2020-2024 OpenFOAM Foundation
\\/ M anipulation |
-------------------------------------------------------------------------------
License
@ -119,6 +119,12 @@ class lambdaThixotropic
//- Optional Bingham plastic yield stress [m^2/s^2]
dimensionedScalar sigmay_;
//- Residual alpha
// Used to stabilise the solution of the lambda equation
// where the phase-fraction is below this value
// Defaults to 1e-6
dimensionedScalar residualAlpha_;
//- Structural parameter
// 0 = freestream value (most liquid)
// 1 = fully built (most solid)