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-   -   DDES length scale (http://www.cfd-online.com/Forums/fluent/101932-ddes-length-scale.html)

simone.bartesaghi May 17, 2012 08:24

DDES length scale
 
Hi,

I'm running a DDES-Spalart-Allmaras simulation in FLUENT and I'd like to visualize the demarcartion of RANS and LES regions.

How does it works the scalar "DES length scale" in FLUENT?

In my results, it's always > 0, and according to theory (FLUENT manual), negative value demark RANS region, positive LES region.

But I'm sure in my simulation it's NOT only LES because of the grid! Can someones explain me how does it work the scalar in Fluent?

Cheers

behest January 27, 2014 08:38

Hello, I am using DDES-SST K-w and I want to visualize the demarcartion of RANS and LES regions. How can I find it? Where is DES length scale in Fluent?

Quote:

Originally Posted by simone.bartesaghi (Post 361655)
Hi,

I'm running a DDES-Spalart-Allmaras simulation in FLUENT and I'd like to visualize the demarcartion of RANS and LES regions.

How does it works the scalar "DES length scale" in FLUENT?

In my results, it's always > 0, and according to theory (FLUENT manual), negative value demark RANS region, positive LES region.

But I'm sure in my simulation it's NOT only LES because of the grid! Can someones explain me how does it work the scalar in Fluent?

Cheers



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