[Calmly]

Hello FOAMers!

I am working on a shock-wave case and I'd like to use the rhoCentralFoam solver.

I understand that this solver is transient but my question is:
Can it be used in LES or in URANS?

Where can I find more info?

Thank you in advance!

[ddemiroguzhan]

Dear Calmly,
You can use rhoCentralFoam for LES or DES simulations. You do not need to do any changes for the solver but you have to change your turbulenceProperties file in order to make a LES analysis.

Oguz

[Calmly]

Originally Posted by ddemiroguzhan

Dear Calmly,
You can use rhoCentralFoam for LES or DES simulations. You do not need to do any changes for the solver but you have to change your turbulenceProperties file in order to make a LES analysis.

Oguz

Dear Oguz,

Thank you very much for your answer!

[maddy11]

In OF V5.x can k-omega SST DES be implemented with no changes except in the turbulence properties file?

[fertinaz]

Hello maddy11

In OF V5.x can k-omega SST DES be implemented with no changes except in the turbulence properties file?

Looks like you can use DES without putting too much effort to it. First check whether is k-omega SST with DES extension implemented using a simple Linux command:

[ertinaz@supernova OpenFOAM-5.x]$ find . -iname "*kOmega*" -type d

This will give you directory names that contain the string kOmega. See that model is actually implemented:

./src/TurbulenceModels/phaseCompressible/RAS/kOmegaSSTSato
./src/TurbulenceModels/turbulenceModels/LES/kOmegaSSTDES
./src/TurbulenceModels/turbulenceModels/Base/kOmegaSST
./src/TurbulenceModels/turbulenceModels/RAS/kOmegaSSTLM
./src/TurbulenceModels/turbulenceModels/RAS/kOmega
./src/TurbulenceModels/turbulenceModels/RAS/kOmegaSSTSAS
./src/TurbulenceModels/turbulenceModels/RAS/kOmegaSST

Then you can also search your model using the name above with grep in the tutorials directory:

[ertinaz@supernova tutorials]$ grep -rn "kOmegaSSTDES" *

This will give you nothing because apparently this model is not used in any of the tutorials. However there is SpalartAllmarasDDES which you can use as a template:

 incompressible/pisoFoam/LES/motorBike/lesFiles/turbulenceProperties:22:    LESModel            SpalartAllmarasDDES;

Now all you need to change is the model name. Replace it by kOmegaSSTDES. Then you might have to figure out if delta function cubeRootVol is fine for you. If you're interested in their implementation details, take a look at the following path:

[ertinaz@supernova OpenFOAM-5.x]$ ls -l ./src/TurbulenceModels/turbulenceModels/LES/LESdeltas/
total 28
drwxrwxr-x. 2 ertinaz ertinaz 4096 Jan 19  2018 cubeRootVolDelta
drwxrwxr-x. 2 ertinaz ertinaz 4096 Jan 19  2018 IDDESDelta
drwxrwxr-x. 2 ertinaz ertinaz 4096 Jan 19  2018 LESdelta
drwxrwxr-x. 2 ertinaz ertinaz 4096 Jan 19  2018 maxDeltaxyz
drwxrwxr-x. 2 ertinaz ertinaz 4096 Jan 19  2018 PrandtlDelta
drwxrwxr-x. 2 ertinaz ertinaz 4096 Jan 19  2018 smoothDelta
drwxrwxr-x. 2 ertinaz ertinaz 4096 Jan 19  2018 vanDriestDelta

Hope this helps


// Fatih

[maddy11]

Thanks a ton Fatih! Was very helpful.
Have u implemented DES model in Openfoam?