code_saturne User's Forum

Hi.
Could anyone tell me if C_S already has validated Detached Eddy Simulation (DES) or detached DES (DDES) capabilities?
Regards
Sergio

Hello,

Which models are you thinking of ? I'll check with our turbulence specialists, but I don't believe we have "true" DES or DDES features (the current focus is mainly on the elliptic blending RSM model, and we have various LES models, but no "zonal" type model which switches from LES to RANS type models).

Regards,

Yvan

Hi,

thanks for your reply.
I am referring particularly to DDES based on reasonably reliable RANS turbulence models (e.g. SST-based, similar to Gritskevich etal., Flow Turbulence Combust, 2012, SA-based DDES similar to Spalart et al., Theoretical and Computational Fluid Dynamics, 2006 or similar).
It would be helpful for me to know if, at present, any other hybrid turbulence modelling capability is already available in Code_Saturne, even models based on non-seamless switch RANS/LES (i.e. regions using RANS, LES and weighted mixtures thereof defined a priori).

Regards
Sergio

Hello,

I'll check if anything of the sort is on someone's roadmap, but as of today, we have no such hybrid models. Note that adding turbulence models or plugging your own model in Code_Saturne is usually not the most difficult type of development in the code (especially if the model is based on an implemented one), though it is often the one which requires the most validation...

So if you're motivated for an addition to the code, you're welcome, and we'll be happy to guide you. If you need a model which is already implemented and validated, you'll need to wait until someone implements it (and again, I need to check the roadmap, but I don't recall this type of model being mentioned except in the case of Code_Saturne, where they do not seem to be a priority for our mainly interna, or at the other end, atmospheric) flows, whereas they seem very popular in aeronautics).

Regards,

Yvan