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HerschelBulkley: Changed the definition of the coefficients and stress to more commonly used forms.

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This does not change the form of the function but the coefficients must be set appropriately.
This commit is contained in:
Henry
2011-05-16 10:08:36 +01:00
parent f0f1e29779
commit 52ce8bae96
2 changed files with 23 additions and 5 deletions
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24
src/transportModels/incompressible/viscosityModels/HerschelBulkley/HerschelBulkley.C
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@ -52,10 +52,28 @@ Foam::viscosityModels::HerschelBulkley::calcNu() const
{ {
dimensionedScalar tone("tone", dimTime, 1.0); dimensionedScalar tone("tone", dimTime, 1.0);
dimensionedScalar rtone("rtone", dimless/dimTime, 1.0); dimensionedScalar rtone("rtone", dimless/dimTime, 1.0);
tmp<volScalarField> sr(strainRate()); tmp<volScalarField> sr(strainRate());
return (min(nu0_,(tau0_ + k_* rtone *( pow(tone * sr(), n_)
- pow(tone*tau0_/nu0_,n_))) / (max(sr(), dimensionedScalar // return
("VSMALL", dimless/dimTime, VSMALL))))); // (
// min
// (
// nu0_,
// (tau0_ + k_*rtone*(pow(tone*sr(), n_) - pow(tone*tau0_/nu0_, n_)))
// /max(sr(), dimensionedScalar("VSMALL", dimless/dimTime, VSMALL))
// )
// );
return
(
min
(
nu0_,
(tau0_ + k_*rtone*pow(tone*sr(), n_))
/(max(sr(), dimensionedScalar ("VSMALL", dimless/dimTime, VSMALL)))
)
);
} }

4
src/transportModels/incompressible/viscosityModels/viscosityModel/viscosityModel.C
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) 2004-2010 OpenCFD Ltd. \\ / A nd | Copyright (C) 2004-2011 OpenCFD Ltd.
\\/ M anipulation | \\/ M anipulation |
------------------------------------------------------------------------------- -------------------------------------------------------------------------------
License License
@ -57,7 +57,7 @@ Foam::viscosityModel::viscosityModel
Foam::tmp<Foam::volScalarField> Foam::viscosityModel::strainRate() const Foam::tmp<Foam::volScalarField> Foam::viscosityModel::strainRate() const
{ {
return mag(symm(fvc::grad(U_))); return sqrt(2.0)*mag(symm(fvc::grad(U_)));
} }