zhyang-dev/openfoam
1
0
Fork 0
mirror of https://develop.openfoam.com/Development/openfoam.git synced 2025-11-28 03:28:01 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

24
src/transportModels/incompressible/viscosityModels/HerschelBulkley/HerschelBulkley.C
View File

@ -52,10 +52,28 @@ Foam::viscosityModels::HerschelBulkley::calcNu() const
{
dimensionedScalar tone("tone", dimTime, 1.0);
dimensionedScalar rtone("rtone", dimless/dimTime, 1.0);
tmp<volScalarField> sr(strainRate());
return (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_) - 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
\\ / O peration |
\\ / A nd | Copyright (C) 2004-2010 OpenCFD Ltd.
\\ / A nd | Copyright (C) 2004-2011 OpenCFD Ltd.
\\/ M anipulation |
-------------------------------------------------------------------------------
License
@ -57,7 +57,7 @@ Foam::viscosityModel::viscosityModel
Foam::tmp<Foam::volScalarField> Foam::viscosityModel::strainRate() const
{
return mag(symm(fvc::grad(U_)));
return sqrt(2.0)*mag(symm(fvc::grad(U_)));
}