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-   -   DES in OpenFOAM (http://www.cfd-online.com/Forums/openfoam-solving/62691-des-openfoam.html)

sven82 March 17, 2009 08:46

DES in OpenFOAM
 
Hi,

i find the spallart allmaras modell in the LES case,
its the equals DES?

The coeffs look like DES, with CDES in the LESProperties !

best regards

mahendra March 10, 2010 01:18

How to set up DES simulation in OpenFOAM-1.5
 
hello everybody

I am looking for setting up a DES simulation, I was wondering if it is similar to LES (LESProperties). Do we need a file DESProperties in /constant and use the oodels code to run it.
Can anyone please let me know how to set up a DES simulation.

Thanks and Regards
Mahendra

sandy March 10, 2010 08:32

I guess, we just need to add RANS model as the wallfuctions to LES, right? Who can give some light?

Budlo March 14, 2012 06:41

Des
 
Hi FOAMer

When we use RANS (Spalart_allmaras) with LES It show that we use a hybrid method. common hybrid method is DES that proposed with Spalart. In OpenFoam when we choice the Spalart in LES It show that we use from a DES method. We first must study about LES then About DES to work correct with it in OpenFoam. Two good references for this two step are :
1- Computational Fluid Dynamics, J.Blazek, Second Edition.
2- Trailing Edge Noise Simulations using IDDES in OpenFOAM, Master of Science Thesis, Olivier Verhoeven, 2011.

Budlo March 14, 2012 06:47

DES in OpenFoam
 
Hi FOAMer

DES is a method that use RANS at the near wall and Use the LES at the far from Wall. the Cost of computational in this method is lower than pure LES but have a good accuracy. So It is a good choice for Industrial application.

hewei November 8, 2012 12:36

Quote:

Originally Posted by Budlo (Post 349370)
Hi FOAMer

DES is a method that use RANS at the near wall and Use the LES at the far from Wall. the Cost of computational in this method is lower than pure LES but have a good accuracy. So It is a good choice for Industrial application.

Hi Budlo,
I tried to choose the LES with SpalartAllmarasIDDES model, is it the hybrid Rans/Les method? how to set the boundary condtions in the 0/ folder, i.e. nuSugs. Do you have some cases about IDDES simulation? thank you!

yours,
Wei

Budlo November 27, 2012 05:42

Hi Hewei
The best tutorial and example for IDDES in OpenFoam is :"Trailing Edge Noise Simulations using IDDES in OpenFOAM" by Olivier Verhoeven ,2011.
All the best
Namdar Budlo.


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