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Tuesday, May 13, 2008

Enable LES (Large Eddy Simulation) in Fluent 2D

To enable Large Eddy Simulation for Fluent two dimensional models, open the Fluent main console and type the following:
(rpsetvar 'les-2d? #t)
Voila!

This will enable LES in 2D models. Note that turbulence is inherently a 3D phenomenon and using LES for two dimensional flows is not recommended. However, in certain cases such as code benchmarks or debugging, it is useful to run LES in 2D. I would also speculate that LES is a valid model in axisymmetric conditions.
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10 comments:

  1. AnonymousJune 22, 2008 at 1:46 PM

    I am unable to open LES for a 2D case using the command that you specified.
    (After giving this command when I go in the viscous model defination options I don't see the LES option should this be like this ?)
    Can you please explain a bit more.

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  2. yNotJune 22, 2008 at 8:58 PM

    I had a typo in the command that has to be used. I just corrected that. There was a missing hyphen.

    Thanks

    ReplyDelete
  3. AnonymousJanuary 31, 2009 at 10:21 AM

    sorry, I could not open LES using your command.Could you please explain it again? Is there any difference between 2D and 3D using LES?

    ReplyDelete
  4. yNotFebruary 1, 2009 at 9:33 AM

    1. open a 2D case file
    note: check Define/Models/Viscous to verify that LES is not present for a 2D problem

    2. type (rpsetvar 'les-2d? #t) and press enter
    note: you have to include the parentheses

    3. go to: Define/Models/Viscous and you'll see that the LES model has been enabled for the 2D case.

    As I mentioned previously, turbulence is a 3D phenomenon and so, by using it to model a 2D problem your results may lose some of their predictive capabilities.

    I hope this answers your questions.

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  5. AnonymousSeptember 29, 2010 at 11:25 AM

    Thanks T0Ny.

    ReplyDelete
  6. AnonymousApril 21, 2011 at 3:43 PM

    just to mention that make sure there is no space left in front of the common"(rpsetvar 'les-2d? #t)" it will not working.
    as i stuck on this stupid issue for 1~2 days~just to let those new comer to take note on that

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  7. buy cialisMay 3, 2011 at 7:27 AM

    Exactly what I was looking for, I need to present a paper based on this information, thanks a lot, it is going to be very helpful.

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  8. AnonymousMay 24, 2011 at 5:35 AM

    hi yNot, i am working on Fluent 3D LES, i am stuck in postprocessing, can you please recommend any tutorial or something?
    Thanks
    mskamran@gmail.com

    ReplyDelete
  9. Buy CialisJune 8, 2011 at 10:25 AM

    this looks fantastic and I can't wait to try it out. Also just wanted to say that I love your blog and have been reading it a lot recently!it can help tp many people to understand it!

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  10. valeriu draganSeptember 22, 2011 at 6:08 AM

    if you have opened a double precission fluent sesion, the command should be :

    (rpsetvar 'les-2ddp? #t)
    it worked for me
    cheers,
    Valeriu

    ReplyDelete