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where to set CFX Transition Model?

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Old   January 4, 2007, 11:11
Default where to set CFX Transition Model?
  #1
steven
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hi,

According to CFX10 manual, looks like we can handel turbulence transition model. I want to set some parameters. I selected SST model, but there is not such as transition model tab at all. I tried to input from ccl, but it always says "it is not physically valid".

What should I do to get access to the transition model?

Thanks
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Old   January 4, 2007, 13:27
Default Re: where to set CFX Transition Model?
  #2
Joe
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Its right there ... just under the turb model selection drop down.
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Old   January 4, 2007, 13:55
Default Re: where to set CFX Transition Model?
  #3
steven
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i talked to an Ansys guy. Seems like we need to buy some sort of "advanced turbulence" license to activate this transition model.
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Old   January 16, 2007, 19:19
Default Re: where to set CFX Transition Model?
  #4
Santiago Orrego.
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Put this lines in the .pre file, because CFX 5.7.1 doesnt have a GUI option.

TURBULENCE MODEL:

Option = SST

TRANSITIONAL TURBULENCE:

Option = Gamma Theta Model

TRANSITION ONSET CORRELATION:

Option = Langtry Menter

END # ONSET CORRELATION

END # TRANSITIONAL TURBULENCE

END # TURBULENCE MODEL:

And read the manual to know about other models. Hope it helps.
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Old   January 16, 2007, 19:21
Default Re: where to set CFX Transition Model?
  #5
Santiago Orrego.
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I tried those lines, but in this time, I cant make converge the solution of a NACA airfoil. If anyody how make it converge, let me know please. Thanks santiago
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Old   January 17, 2007, 11:38
Default Re: where to set CFX Transition Model?
  #6
opaque
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Dear Steven and Santiago,

The transition model in ANSYS CFX has been evolving over the years (and releases)..

It became visible in ANSYS CFX 10.0 which is a good reason not to use a previous version (in 5.7.1 was beta feature).

Most important is that you require an additional license to use/access it. Please contact you CFX help desk or provider for information.

Opaque.

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Old   January 17, 2007, 12:19
Default Re: where to set CFX Transition Model?
  #7
Santiago Orrego.
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I made it converge, changing the Ratio to the mesh, to 1.02. Hope it helps santiago.
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