I've read a paper from Fluent on DES simulations using SA as a base. I also have a strong memory that someone talked about that Fluent now had the option to run hybrid RANS/LES or DES simulations. However, now I can't find a way to enable this in the text interface. Does anyone know if a DES model is available in the last commercial release of Fluent or is it still just available in development versions? If it is available, how do you enable it?

Hi, Noting that i have no experience with DES, i can tell that DES is available in 6.1. In text user interface typing de-mo-vi-tu-de enables the model. (you may need to select a turb. model in the GUI before typing the commands)

Best Regards

emre

Ah, it seems as if DES is available in 6.1.18 but not in 6.1.22. This is a bit worrying. Anyone know why Fluent removed it from the 6.1.22 release? Was it buggy? Or have they just changed the way you activate it in 6.1.22?

Hello dear moderator, DES is also available in 6.1.22 (just checked it) There is one point that in order to activate the model, S-A should be chosen from the GUI first. Then under turbulence expert- you see turb-non-newtonian and detached-eddy-simulation options. If you select ke for example, then under turbulence expert you will see low-re-ke, kato-launder-model and turb-non-newtonian. Let me know if it works Regards emre

greetings, jonas.

as far as i'm aware, there were no modifications made to how the DES turbulence model is enabled in versions 6.1.18 and the latest commercial release, 6.1.22.

to expand on emre's feedback, the DES model can be accessed by first (1) enabling the spalart-allmaras turbulence model then (2) enabling the DES model from the TUI via

define/models/viscous/turbulence-expert

the choice "detached-eddy-simulation?" should be available as a menu option.

i've tried these steps to enable the DES model in FLUENT versions 6.1.18 and 6.1.22. i was able to successfully access the model in both versions.

i hope these instructions lead to success for you. if not, please let me know.

eric.

Great! I got DES working also in 6.1.22... you just had to know that you need to activate SA first to activated the correct magical "turbulence expert" menu Thanks emre and eric!

Btw, I've got a paper by Sung-Eun on DES simulations using Fluent (computing airfoils near stall). Have you got any other documentation on using DES in Fluent? We're trying to simulate turbine blades with partially separated pressure sides.

Dear Jonas,

Could you please let me know where I can find the paper from Sung-Eun on DES simulations using Fluent ?

Your reply would be very mcuh appreciated.

Kindest regards

Bowen

aerofoils?? near stall, I have just read DES doesn't really work in 2D. Can anyone point me in the direction of a good reference for meshing a DES problem, I have heard about the requirements, (don't overdo the near-wall after it's adequate) but I don't know the numbers involved, where DES meets RANS, so I don't know what to look out for.

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