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June 12, 2007, 10:25 
BSL komega model in CFX 10

#1 
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Hi!
Is the BSL komega model available in CFX 10? It is not listed when choosing turbulence models in CFXPre but I thought perhaps it is available through CCL. I have checked the manual but so far no luck. /Kasper 

June 12, 2007, 11:24 
Re: BSL komega model in CFX 10

#2 
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It's there. Click on the [...] button next to the pull down list.


June 12, 2007, 11:40 
Re: BSL komega model in CFX 10

#3 
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I am afraid it isn't. The regular komega model is there but not the BSL version. Likewise the manual doesn't list it. On page 145 of the CFXPre 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: ... • kEpsilon: ... • None (Laminar): ... • Shear Stress Transport: ... • QI / SSG / LRR Reynolds Stress: ... • Zero Equation: ... • RNG kEpsilon: ... • kOmega: ... • Omega Reynolds Stress / BSL Reynolds Stress: ... • LES Smagorinsky: ... • Detached Eddy Simulation: ... /Kasper 

June 12, 2007, 13:35 
Re: BSL komega model in CFX 10

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It should be there... I'm looking at it right now. Note that it isn't called "BSL komega", 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 

June 12, 2007, 13:39 
Re: BSL komega model in CFX 10

#5 
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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 

June 13, 2007, 03:42 
Re: BSL komega model in CFX 10

#6 
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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


June 13, 2007, 04:37 
Re: BSL komega model in CFX 10

#7 
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By the way, I also don't know how to activate low Reynolds ke model in CFX, would you give me a hint? Thanks a lot!


June 13, 2007, 05:34 
Re: BSL komega model in CFX 10

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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: Subobject 'TURBULENCE MODEL' is not allowed in /FLOW/DOMAINomain 1/DOMAIN MODELS Error: Subobject 'TURBULENT WALL FUNCTIONS' is not allowed in /FLOW/DOMAINomain 1/DOMAIN MODELS BSL kw model is forbidden? Why? Thank you! 

June 13, 2007, 06:47 
Re: BSL komega model in CFX 10

#9 
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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 komega 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 eddyviscostiy in the SST model by comparing to the BSL model. /Kasper 

June 13, 2007, 07:22 
Re: BSL komega model in CFX 10

#10 
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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. 

June 13, 2007, 10:29 
Re: BSL komega model in CFX 10

#11 
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kw is a low reynolds model and SST is a combination that uses kw next to the walls and elsewhere ke. Bye.


June 13, 2007, 18:34 
Re: BSL komega model in CFX 10

#12 
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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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