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ThermophysicalTransportModels: Added temperature gradient based heat flux models

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Fourier, eddyDiffusivity and nonUnityLewisEddyDiffusivity thermophysical
transport models now apply an implicit energy correction to a temperature
gradient based heat-flux to provide computational stability and efficiency while
converging to temperature gradient based solution.  This ensures consistent heat
exchange between fluid and solid regions in CHT cases and with heat-flux
boundaries.

The Fourier and eddyDiffusivity models support single specie systems only
whereas nonUnityLewisEddyDiffusivity supports specie diffusion with independent
specification of turbulent Prandtl and Schmidt numbers, i.e. non-unity Lewis
number.

The unityLewisFourier and unityLewisEddyDiffusivity thermophysical transport
models use an implicit energy gradient based heat-flux which is optimal for
numerical stability and convergence but does not guarantee consistent heat
exchange between fluid and solid regions and heat-flux boundaries in the
presence of gradients of heat capacity.  Both of these models support specie
diffusion with the restriction that the laminar and turbulent Prandtl and
Schmidt numbers are equal, i.e. unity Lewis number.

The thermophysical transport model is specified in the optional
thermophysicalTransport dictionary; if this file is not present the
unityLewisFourier model is selected for laminar and unityLewisEddyDiffusivity
for turbulent cases for backward compatibility.

The chtMultiRegionFoam tutorial cases have been updated to use the most
appropriate of the new thermophysical transport models.
This commit is contained in:
Henry Weller
2020-09-23 16:15:38 +01:00
parent f3c21b74a8
commit 747cea6d0f
23 changed files with 1166 additions and 158 deletions
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26
tutorials/heatTransfer/chtMultiRegionFoam/coolingSphere/constant/thermophysicalTransport Normal file
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/*--------------------------------*- C++ -*----------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Version: dev
\\/ M anipulation |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
location "constant";
object thermophysicalTransport;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
RAS
{
model eddyDiffusivity;
Prt 0.85;
}
// ************************************************************************* //

26
tutorials/heatTransfer/chtMultiRegionFoam/coolingSphere/templates/materials/air/thermophysicalTransport Normal file
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@ -0,0 +1,26 @@
/*--------------------------------*- C++ -*----------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Version: dev
\\/ M anipulation |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
location "constant";
object thermophysicalTransport;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
RAS
{
model eddyDiffusivity;
Prt 0.85;
}
// ************************************************************************* //

26
tutorials/heatTransfer/chtMultiRegionFoam/coolingSphere/templates/materials/water/thermophysicalTransport Normal file
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/*--------------------------------*- C++ -*----------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Version: dev
\\/ M anipulation |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
location "constant";
object thermophysicalTransport;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
RAS
{
model eddyDiffusivity;
Prt 0.85;
}
// ************************************************************************* //

24
tutorials/heatTransfer/chtMultiRegionFoam/heatExchanger/constant/porous/thermophysicalTransport Normal file
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@ -0,0 +1,24 @@
/*--------------------------------*- C++ -*----------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Version: dev
\\/ M anipulation |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
location "constant";
object thermophysicalTransport;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
laminar
{
model Fourier;
}
// ************************************************************************* //

27
tutorials/heatTransfer/chtMultiRegionFoam/reverseBurner/constant/gas/thermophysicalTransport Normal file
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@ -0,0 +1,27 @@
/*--------------------------------*- C++ -*----------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Version: dev
\\/ M anipulation |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
location "constant";
object thermophysicalTransport;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
RAS
{
model nonUnityLewisEddyDiffusivity;
Prt 0.85;
Sct 0.7;
}
// ************************************************************************* //

26
tutorials/heatTransfer/chtMultiRegionFoam/shellAndTubeHeatExchanger/constant/shell/thermophysicalTransport Normal file
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@ -0,0 +1,26 @@
/*--------------------------------*- C++ -*----------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Version: dev
\\/ M anipulation |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
location "constant";
object thermophysicalTransport;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
RAS
{
model eddyDiffusivity;
Prt 0.85;
}
// ************************************************************************* //

1
tutorials/heatTransfer/chtMultiRegionFoam/shellAndTubeHeatExchanger/constant/tube/thermophysicalTransport Symbolic link
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../shell/thermophysicalTransport