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ENH: Surface film modelling - updated thixotropic viscosity model

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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), filmViscosityModel(typeName, owner, dict, mu),
a_(coeffDict_.lookup("a")), a_("a", dimless/dimTime, coeffDict_.lookup("a")),
b_(coeffDict_.lookup("b")), b_("b", dimless, coeffDict_.lookup("b")),
c_(coeffDict_.lookup("c")), d_("d", dimless, coeffDict_.lookup("d")),
d_(coeffDict_.lookup("d")), c_("c", pow(dimTime, d_.value() - scalar(1)), coeffDict_.lookup("c")),
mu0_(coeffDict_.lookup("mu0")), mu0_("mu0", dimPressure*dimTime, coeffDict_.lookup("mu0")),
muInf_(coeffDict_.lookup("muInf")), muInf_("muInf", mu0_.dimensions(), coeffDict_.lookup("muInf")),
K_(1.0 - Foam::sqrt(muInf_/mu0_)), K_(1.0 - Foam::sqrt(muInf_/mu0_)),
lambda_ lambda_
( (
@ -144,27 +144,33 @@ void thixotropicViscosity::correct
const volScalarField& delta = film.delta(); const volScalarField& delta = film.delta();
const volScalarField& deltaRho = film.deltaRho(); const volScalarField& deltaRho = film.deltaRho();
const surfaceScalarField& phi = film.phi(); const surfaceScalarField& phi = film.phi();
const volScalarField& alpha = film.alpha();
// gamma-dot (shear rate) raised to the power d // gamma-dot (shear rate)
volScalarField gDotPowD volScalarField gDot("gDot", alpha*mag(U - Uw)/(delta + film.deltaSmall()));
(
"gDotPowD",
pow(mag(U - Uw)/(delta + film.deltaSmall()), d_)
);
dimensionedScalar c0("SMALL", dimMass/sqr(dimLength)/dimTime, SMALL); if (debug && this->owner().regionMesh().time().outputTime())
volScalarField coeff(-deltaRho*c_*gDotPowD + c0); {
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 fvScalarMatrix lambdaEqn
( (
fvm::ddt(deltaRho, lambda_) fvm::ddt(lambda_)
+ fvm::div(phi, lambda_) + fvm::div(phiU, lambda_)
- fvm::Sp(fvc::div(phi), lambda_) - fvm::Sp(fvc::div(phiU), lambda_)
== ==
deltaRho*a_*pow((1.0 - lambda_), b_) a_*pow((1.0 - lambda_), b_)
+ fvm::SuSp(coeff, lambda_) + fvm::SuSp(coeff, lambda_)
); );
lambdaEqn.relax(); lambdaEqn.relax();
lambdaEqn.solve(); 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 \\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | \\ / O peration |
\\ / A nd | Copyright (C) 2013 OpenFOAM Foundation \\ / A nd | Copyright (C) 2013-2014 OpenFOAM Foundation
\\/ M anipulation | \\/ M anipulation |
------------------------------------------------------------------------------- -------------------------------------------------------------------------------
License License
@ -105,38 +105,18 @@ protected:
// Protected data // 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 //- Model `a' coefficient
dimensionedScalar a_; dimensionedScalar a_;
//- Model `b' coefficient //- Model `b' coefficient
dimensionedScalar b_; dimensionedScalar b_;
//- Model `c' coefficient
dimensionedScalar c_;
//- Model `d' coefficient //- Model `d' coefficient
dimensionedScalar d_; dimensionedScalar d_;
//- Model `c' coefficient (read after d since dims depend on d value)
dimensionedScalar c_;
//- Limiting viscosity when lambda = 1 //- Limiting viscosity when lambda = 1
dimensionedScalar mu0_; dimensionedScalar mu0_;