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Old   February 29, 2008, 13:36
Default LES models:
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Jonathan Lemay
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Dear CFD users

I am performing a LES simulations on a cold flow of a Bluff-body burner. When I look at the Transient Statistics available in the Output Control tab, there is something called LES Dynamic Model Coefficient.

I though that the only model for LES and Subgridscale available in CFX was the Smagorinski model... When I look on what I found in the Output Control it seems that their is another model available. If it not the case what this LES Dynamic Model Coefficient mean???

I am looking to use the Germano dynamic approach, as it let the C constant be dynamic for each time step.

Thanks in advance

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Old   February 29, 2008, 14:07
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opaque
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Dear Jonathan,

What version of ANSYS CFX are you using? I just look in ANSYS 11.0, and there are 3 LES models: Smagorinsky, WALE and Dynamic.

Setup the case as transient, and under Domain/Fluid Models/Turbulence Model check in the ... section.

Opaque
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Old   February 29, 2008, 15:50
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Jonathan Lemay
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Dear Opaque

Thanks for your tips. You are right... I have been in another computer in which Ansys 11.0 is installed. I found the Dynamic model. My problem is that on the cluster of my school the WALE and Dynamic option do not appear.

Is there a way to make them appearing. Should we get a special license for that?

Regards
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Old   February 29, 2008, 18:13
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alpha
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Have you enabled beta fatures of CFX. If you do they should appear where opaque mentioned.

alpha
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Old   February 29, 2008, 19:10
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Jonathan Lemay
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Dear Alpha

Would you please tell me how can I do to verify if they are turned ok?

regards
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Old   March 1, 2008, 10:42
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Hekler
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look in the options menu in pre. Beta features are enabled with a tickbox.
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Old   March 3, 2008, 07:51
Default Re: LES models:
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Jonathan Lemay
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Dear Hekler

Thanks for your tips. I finally find out how to enable de beta features of CFX. Great I will be able to run LES-Dynamic!! regards
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