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BSL k-omega model in CFX 10

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Old   June 12, 2007, 10:25
Default BSL k-omega model in CFX 10
  #1
Kasper
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Hi!

Is the BSL k-omega model available in CFX 10? It is not listed when choosing turbulence models in CFX-Pre but I thought perhaps it is available through CCL. I have checked the manual but so far no luck.

/Kasper
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Old   June 12, 2007, 11:24
Default Re: BSL k-omega model in CFX 10
  #2
Robin
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It's there. Click on the [...] button next to the pull down list.
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Old   June 12, 2007, 11:40
Default Re: BSL k-omega model in CFX 10
  #3
Kasper
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I am afraid it isn't. The regular k-omega model is there but not the BSL version. Likewise the manual doesn't list it. On page 145 of the CFX-Pre manual the available turbulence models are listed. I've pasted it in below.

You can select one of the following turbulence models (the advanced model controls, which are discussed in each section): • Fluid Dependent: ... • k-Epsilon: ... • None (Laminar): ... • Shear Stress Transport: ... • QI / SSG / LRR Reynolds Stress: ... • Zero Equation: ... • RNG k-Epsilon: ... • k-Omega: ... • Omega Reynolds Stress / BSL Reynolds Stress: ... • LES Smagorinsky: ... • Detached Eddy Simulation: ...

/Kasper
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Old   June 12, 2007, 13:35
Default Re: BSL k-omega model in CFX 10
  #4
Robin
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It should be there... I'm looking at it right now. Note that it isn't called "BSL k-omega", just "BSL". It isn't controlled by a specific license either. The formulation is discussed in the manual, but nothing more. BSL was never a very good model and SST was developed to resolve its defficiencies so its use is not encouraged.

Other than academic interest, is there a specific reason you want to run this?

If you still can't see it, here is the CCL:

FLOW:
DOMAIN: Domain 1
DOMAIN MODELS:
TURBULENCE MODEL:
Option = BSL
END
TURBULENT WALL FUNCTIONS:
Option = Automatic
END
END
END
END
-Robin
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Old   June 12, 2007, 13:39
Default Re: BSL k-omega model in CFX 10
  #5
opaque
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Dear Kasper,

Robin is correct.. It is there after clicking on ...

It is listed as BSL

Are you looking at multiphase flows?

Regards, Opaque

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Old   June 13, 2007, 03:42
Default Re: BSL k-omega model in CFX 10
  #6
Li Rong
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Actually I have the same problem with Kasper. I click the ... button, but there isn't BSL model but BSL Reynolds stress model, I don't think they are the same model
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Old   June 13, 2007, 04:37
Default Re: BSL k-omega model in CFX 10
  #7
Li Rong
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By the way, I also don't know how to activate low Reynolds k-e model in CFX, would you give me a hint? Thanks a lot!
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Old   June 13, 2007, 05:34
Default Re: BSL k-omega model in CFX 10
  #8
Li Rong
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I tried the .ccl file that Robin provided, but CFX gave the following error information:

CCLAPI::validateData - CCL validation failed with message: Error: Sub-object 'TURBULENCE MODEL' is not allowed in /FLOW/DOMAINomain 1/DOMAIN MODELS Error: Sub-object 'TURBULENT WALL FUNCTIONS' is not allowed in /FLOW/DOMAINomain 1/DOMAIN MODELS

BSL k-w model is forbidden? Why?

Thank you!
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Old   June 13, 2007, 06:47
Default Re: BSL k-omega model in CFX 10
  #9
Kasper
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Hi again!

Apparently this is not such an easy question since some people can use the model and some can't.

http://imageshack.dk//viewimage.php?...e/9Ib29514.jpg

The above link is to a screengrab showing that the BSL isn't in my list. I tried using the CCL but got the following response from Pre:

The parameter "Option in "/FLOW/DOMAIN:Bump/FLUID MODELS/TURBULENCE MODEL" has the value "BSL". This does not match any of the allowed values: "Laminar, k epsilon, SST, Zero Equation, ...".

I am interested in the BSL k-omega model mostly for comparison purposes. I have a case where the SST model underpredicts the turbulent stresses thereby leading to an overprediction of separation. So I was interested in seeing the effect of the delimiter of the eddy-viscostiy in the SST model by comparing to the BSL model.

/Kasper

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Old   June 13, 2007, 07:22
Default Re: BSL k-omega model in CFX 10
  #10
opaque
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Dear Kasper,

Thanks for the snapshot.. It seems you are running ANSYS CFX 10.0.. Unfortunately, BSL was not available in the GUI back then.. It is in 11.0, and why Robin and I can see it listed..

If you managed to set the Option = BSL, and got the warning

The parameter "Option in "/FLOW/DOMAIN:Bump/FLUID MODELS/TURBULENCE MODEL" has the value "BSL". This does not match any of the allowed values: "Laminar, k epsilon, SST, Zero Equation, ...".

Just write the definition file, and try it in the solver.. It should run.. I do not recall exactly why it was not in the GUI for 10.0

Good luck,

Opaque.

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Old   June 13, 2007, 10:29
Default Re: BSL k-omega model in CFX 10
  #11
Juan Martin Catelén
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k-w is a low reynolds model and SST is a combination that uses k-w next to the walls and elsewhere k-e. Bye.

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Old   June 13, 2007, 18:34
Default Re: BSL k-omega model in CFX 10
  #12
Kasper
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Hey Opaque!

It worked when using the CCL and ignoring the warnings from Pre when writing the .def file. The Solver started and finished without any problems.

Thanks for the help!

/Kasper
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