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multiphaseEulerFoam: Added minimum diameter limit to KochFriedlander sintering model

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Patch contributed by Institute of Fluid Dynamics,
Helmholtz-Zentrum Dresden - Rossendorf (HZDR)
This commit is contained in:
Will Bainbridge
2021-01-15 15:25:18 +00:00
parent fe3910de34
commit d7fd626e41
2 changed files with 15 additions and 6 deletions
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10
applications/solvers/multiphase/multiphaseEulerFoam/phaseSystems/diameterModels/velocityGroup/sizeGroup/shapeModels/fractal/sinteringModels/KochFriedlander/KochFriedlander.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) 2019-2020 OpenFOAM Foundation
\\ / A nd | Copyright (C) 2019-2021 OpenFOAM Foundation
\\/ M anipulation |
-------------------------------------------------------------------------------
License
@ -59,7 +59,8 @@ KochFriedlander
Cs_(dict_.lookup<scalar>("Cs")),
n_(dict_.lookup<scalar>("n")),
m_(dict_.lookup<scalar>("m")),
Ta_(dict_.lookup<scalar>("Ta"))
Ta_(dict_.lookup<scalar>("Ta")),
dpMin_(dict_.lookupOrDefault<scalar>("dpMin", 0))
{}
@ -93,9 +94,10 @@ Foam::diameterModels::shapeModels::sinteringModels::KochFriedlander::tau() const
forAll(tau, celli)
{
const scalar dp = 6/max(6/fi.dSph().value(), kappai[celli]);
tau[celli] =
Cs_*pow(6.0/max(6.0/fi.dSph().value(), kappai[celli]), n_)
*pow(T[celli], m_)*exp(Ta_/T[celli]);
Cs_*pow(dp, n_)*pow(T[celli], m_)*exp(Ta_/T[celli]*(1 - dpMin_/dp));
}
return tTau;

11
applications/solvers/multiphase/multiphaseEulerFoam/phaseSystems/diameterModels/velocityGroup/sizeGroup/shapeModels/fractal/sinteringModels/KochFriedlander/KochFriedlander.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) 2019-2020 OpenFOAM Foundation
\\ / A nd | Copyright (C) 2019-2021 OpenFOAM Foundation
\\/ M anipulation |
-------------------------------------------------------------------------------
License
@ -29,9 +29,12 @@ Description
sintering is given by
\f[
\tau = c_s d_{p_i}^n T^m \exp\left(\frac{T_a}{T}\right)\;.
\tau = c_s d_{p_i}^n T^m \exp(T_a/T \cdot [1 - d_{p,min}/d_{p_i}])\;.
\f]
Note that the correction factor in the exponential function can be
eliminated by setting \f$d_{p,min}\f$ to zero which is done by default.
Reference:
\verbatim
Koch, W., & Friedlander, S. K. (1990).
@ -47,6 +50,7 @@ Usage
n | Particle diameter exponent | yes | none
m | Temperature exponent | yes | none
Ta | Activation temperature | yes | none
dpMin | Minimum primary particle diameter | no | 0
\endtable
SourceFiles
@ -95,6 +99,9 @@ class KochFriedlander
//- Activation temperature
scalar Ta_;
//- Minimum primary particle diameter, defaults to Zero
scalar dpMin_;
public: