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solver for LES natural convection

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Old   May 24, 2021, 16:43
Default solver for LES natural convection
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enamul Hasan
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Hello everyone.
Is there any particular solver for LES model, incompressible, buoyant flow? I couldn't find any. If you have any custom solver for this, would you please share with me?
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Old   May 25, 2021, 07:42
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Said
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Hi Hasan,

Why don't you use buoyantFoam?


Quote:
buoyantPimpleFoam: Transient solver for buoyant, turbulent flow of compressible fluids for ventilation and heat-transfer

Quote:
buoyantBoussinesqPimpleFoam: Transient solver for buoyant, turbulent flow of incompressible fluids.
You can get the solver which you are looking for by changing the turbulent properties to LES.

If you type buoyantBoussinesqPimpleFoam -listTurbulenceModels you can see the options.

Quote:
LES models
12
(
DeardorffDiffStress
Smagorinsky
SpalartAllmarasDDES
SpalartAllmarasDES
SpalartAllmarasIDDES
WALE
dynamicKEqn
dynamicLagrangian
kEqn
kOmegaSSTDDES
kOmegaSSTDES
kOmegaSSTIDDES
)
Kind Regards,
Said.

Last edited by saidc.; May 25, 2021 at 09:57.
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Old   May 25, 2021, 09:51
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enamul Hasan
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Hi Said,
Thank you for the reply. I searched the tutorial section of buoyantBoussinesqPimpleFoam solver but didn't find any LES example. All of these are in RANS model. If I want to change these into LES, which files do I need to change except the constant (model name) and 0 (boundary condition) folder? Do I need to make any changes to the system folder?
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Old   May 25, 2021, 10:26
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Said
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Hi Hasan,

You can search in tutorial files with
Code:
grep -r LES
for which files use LES turbulence model. For example when you type that you will find a LES turbulence model which you can coppy to your case directly -if LESModel is appropriate for you- in "incompressible/pisoFoam/LES/pitzDaily/constant/turbulenceProperties".

In system folder you should set maxCo (courant number), time step and maybe runTimeModifiable to yes. I have attached a sample turbulenceProperties and controlDict file for you.

Edit: Also if it doesn't suit you, you should make changes in fvSchemes and fvSolution.

Kind Regards,
Said.
Attached Files
File Type: txt turbulenceProperties.txt (1.0 KB, 3 views)
File Type: txt controlDict.txt (1.3 KB, 2 views)
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buoyancy, convection, les, openfoam

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