about advance turbulence controlin CFX5.6
 

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!

Re: about advance turbulence controlin CFX5.6
 

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.

Re: about advance turbulence controlin CFX5.6
 

Dear Opaque, Thank you for your reply. I want to know Whether I can modify the turbulence model constants. akang

Re: about advance turbulence controlin CFX5.6
 

Dear akang,

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

Opaque..

Re: about advance turbulence controlin CFX5.6
 

Dear Opaque, If the k-Epsilon turbulence model? akang

Re: about advance turbulence controlin CFX5.6
 

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.

Re: about advance turbulence controlin CFX5.6
 

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

Re: about advance turbulence controlin CFX5.6
 

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

Re: about advance turbulence controlin CFX5.6
 

Dear Opaque, Thank you very much! If I get some interesting results, I'll share them!

akang