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Old   April 23, 2007, 21:07
Default about advance turbulence controlin CFX5.6
  #1
akang
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Hi, everybody, can any of you tell me that if CFX5.6 has the advanced turbulence model control as in CFX10 and how can I set or modify them? Thank you!
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Old   April 24, 2007, 08:53
Default Re: about advance turbulence controlin CFX5.6
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opaque
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Dear akang,

The Advanced turbulence model control were not available in the 5.6 release .

Several of the current advanced control were hidden as expert parameters, and other did not even exists.

Which one are you looking for?

Opaque.

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Old   May 1, 2007, 22:24
Default Re: about advance turbulence controlin CFX5.6
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akang
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Dear Opaque, Thank you for your reply. I want to know Whether I can modify the turbulence model constants. akang
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Old   May 2, 2007, 14:59
Default Re: about advance turbulence controlin CFX5.6
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opaque
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Dear akang,

I am sorry.. for which model?, and which constants?.. Not all of them were available to the user..

Opaque..

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Old   May 4, 2007, 05:08
Default Re: about advance turbulence controlin CFX5.6
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akang
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Dear Opaque, If the k-Epsilon turbulence model? akang
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Old   May 4, 2007, 11:31
Default Re: about advance turbulence controlin CFX5.6
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opaque
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Dear akang,

OK.. it is the k-epsilon model. Which constants in the k-epsilon model do you want to change using the 5.6 release version?

Please as specific as you can be, on which model constant you need.. Just a heads up.. They will not support CEL expressions at all since they were expert parameters back then.

Answering "All" is not a choice..

Regards, Opaque.

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Old   May 5, 2007, 06:29
Default Re: about advance turbulence controlin CFX5.6
  #7
akang
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Dear Opaque, Thank you for your reply very much! Can Cmiu,Sigma_k,Sigma_epsilon,C_epsilon1 and C_epsilon2 be modified? Or just some of them can be modified? Thank you again!

akang
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Old   May 7, 2007, 09:03
Default Re: about advance turbulence controlin CFX5.6
  #8
opaque
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Dear akang,

Below is what you need to modify those models constants you mentioned.. This only worked up until 5.6.. Latest releases do not support these parameters.

I am very skeptical of modifications of the model coefficients by those who are not turbulence modeling experts since there are quite a few relations between the coefficients themselves to satisfy some physics. If you know what you are doing, good luck.

Opaque.

FLOW: EXPERT PARAMETERS:

cmu turbulence model constant = 0.09

ce1 ke model constant = 1.44

ce2 ke model constant = 1.92

sigmak ke model constant = 1.0

sigmae ke model constant = 1.3

END END

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Old   May 9, 2007, 06:30
Default Re: about advance turbulence controlin CFX5.6
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akang
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Dear Opaque, Thank you very much! If I get some interesting results, I'll share them!

akang
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