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ENH: Surface film modelling - updated thixotropic viscosity model

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This commit is contained in:
andy
2014-09-24 13:28:56 +01:00
committed by Andrew Heather
parent 666b21b500
commit 25cb8d0eec
2 changed files with 28 additions and 42 deletions
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42
src/regionModels/surfaceFilmModels/submodels/thermo/filmViscosityModel/thixotropicViscosity/thixotropicViscosity.C
View File

@ -91,12 +91,12 @@ thixotropicViscosity::thixotropicViscosity
)
:
filmViscosityModel(typeName, owner, dict, mu),
a_(coeffDict_.lookup("a")),
b_(coeffDict_.lookup("b")),
c_(coeffDict_.lookup("c")),
d_(coeffDict_.lookup("d")),
mu0_(coeffDict_.lookup("mu0")),
muInf_(coeffDict_.lookup("muInf")),
a_("a", dimless/dimTime, coeffDict_.lookup("a")),
b_("b", dimless, coeffDict_.lookup("b")),
d_("d", dimless, coeffDict_.lookup("d")),
c_("c", pow(dimTime, d_.value() - scalar(1)), coeffDict_.lookup("c")),
mu0_("mu0", dimPressure*dimTime, coeffDict_.lookup("mu0")),
muInf_("muInf", mu0_.dimensions(), coeffDict_.lookup("muInf")),
K_(1.0 - Foam::sqrt(muInf_/mu0_)),
lambda_
(
@ -144,27 +144,33 @@ void thixotropicViscosity::correct
const volScalarField& delta = film.delta();
const volScalarField& deltaRho = film.deltaRho();
const surfaceScalarField& phi = film.phi();
const volScalarField& alpha = film.alpha();
// gamma-dot (shear rate) raised to the power d
volScalarField gDotPowD
(
"gDotPowD",
pow(mag(U - Uw)/(delta + film.deltaSmall()), d_)
);
// gamma-dot (shear rate)
volScalarField gDot("gDot", alpha*mag(U - Uw)/(delta + film.deltaSmall()));
dimensionedScalar c0("SMALL", dimMass/sqr(dimLength)/dimTime, SMALL);
volScalarField coeff(-deltaRho*c_*gDotPowD + c0);
if (debug && this->owner().regionMesh().time().outputTime())
{
gDot.write();
}
dimensionedScalar deltaRho0("deltaRho0", deltaRho.dimensions(), ROOTVSMALL);
surfaceScalarField phiU(phi/fvc::interpolate(deltaRho + deltaRho0));
dimensionedScalar c0("c0", dimless/dimTime, ROOTVSMALL);
volScalarField coeff("coeff", -c_*pow(gDot, d_) + c0);
fvScalarMatrix lambdaEqn
(
fvm::ddt(deltaRho, lambda_)
+ fvm::div(phi, lambda_)
- fvm::Sp(fvc::div(phi), lambda_)
fvm::ddt(lambda_)
+ fvm::div(phiU, lambda_)
- fvm::Sp(fvc::div(phiU), lambda_)
==
deltaRho*a_*pow((1.0 - lambda_), b_)
a_*pow((1.0 - lambda_), b_)
+ fvm::SuSp(coeff, lambda_)
);
lambdaEqn.relax();
lambdaEqn.solve();

28
src/regionModels/surfaceFilmModels/submodels/thermo/filmViscosityModel/thixotropicViscosity/thixotropicViscosity.H
View File

@ -2,7 +2,7 @@
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration |
\\ / A nd | Copyright (C) 2013 OpenFOAM Foundation
\\ / A nd | Copyright (C) 2013-2014 OpenFOAM Foundation
\\/ M anipulation |
-------------------------------------------------------------------------------
License
@ -105,38 +105,18 @@ protected:
// Protected data
/*
//- Model `a' coefficient
scalar a_;
//- Model `b' coefficient
scalar b_;
//- Model `c' coefficient
scalar c_;
//- Model `d' coefficient
scalar d_;
//- Limiting viscosity when lambda = 1
scalar mu0_;
//- Limiting viscosity when lambda = 0
scalar muInf_;
*/
//- Model `a' coefficient
dimensionedScalar a_;
//- Model `b' coefficient
dimensionedScalar b_;
//- Model `c' coefficient
dimensionedScalar c_;
//- Model `d' coefficient
dimensionedScalar d_;
//- Model `c' coefficient (read after d since dims depend on d value)
dimensionedScalar c_;
//- Limiting viscosity when lambda = 1
dimensionedScalar mu0_;