CFX11 Vs. CFX12/ CFX13

mohammad · May 24, 2011, 23:56

Hey;
I'm simulating the NREL wind turbine model with CFX11.

At this stage, my plan is to investigate the different turbulent models( DES, SST, SA) and transitional flow.

I have some questions now.

1-Do you have any information about the advantages of the newer versions over CFX 11 about the use of turbulent models? is there any newer turbulent option or influential modification available in newer versions?

2-I read the REF[1] about a transitional model and its better prediction of wind turbine performance. Is this model available in Ansys CFX v11( 2007!!!). If not, which version of CFX has this transitional model?

Reference
[1]-Predicting 2D Airfoil and 3D Wind Turbine Rotor Performance using a Transition Model for General CFD Codes; R.B. Langtry, J. Gola, and F.R. Menter , AIAA; 2006

ghorrocks · May 25, 2011, 07:38

There has been incremental development on the solvers generally. The V13 solver runs 10% or 20% faster than V11, maybe more.

The turbulence models and general solver has had incremental development. I am not exactly sure which version of CFX has which turbulence model.

I cannot see why you would do anything but get the current version. ANSYS will not sell you an old version, so why consider it?

mohammad · May 26, 2011, 04:11

Dear Glenn Horrocks.
Thank you for your help.
To those how may read this page later:
The transitional model is available in CFX-11. And the details are presented in "ANSYS CFX Transition Model Formulation " section of Ansys help.
Also if you see the above help pages , you will see it's similar with the Menter[AIAA-2006] paper. it means that the in CFX-11 the cited paper is used.

Good Luck

May 24, 2011, 23:56	CFX11 Vs. CFX12/ CFX13	#1
mohammad Senior Member mohammad Join Date: Dec 2010 Location: UK Posts: 245 Rep Power: 16	Hey; I'm simulating the NREL wind turbine model with CFX11. At this stage, my plan is to investigate the different turbulent models( DES, SST, SA) and transitional flow. I have some questions now. 1-Do you have any information about the *advantages* of the newer versions over CFX 11 about the use of turbulent models? is there any newer turbulent option or influential modification available in newer versions? 2-I read the REF[1] about a transitional model and its better prediction of wind turbine performance. Is this model available in Ansys CFX v11( 2007!!!). If not, which version of CFX has this transitional model? Reference [1]-Predicting 2D Airfoil and 3D Wind Turbine Rotor Performance using a Transition Model for General CFD Codes; R.B. Langtry, J. Gola, and F.R. Menter , AIAA; 2006

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May 25, 2011, 07:38		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,854 Rep Power: 144	There has been incremental development on the solvers generally. The V13 solver runs 10% or 20% faster than V11, maybe more. The turbulence models and general solver has had incremental development. I am not exactly sure which version of CFX has which turbulence model. I cannot see why you would do anything but get the current version. ANSYS will not sell you an old version, so why consider it?

May 26, 2011, 04:11		#3
mohammad Senior Member mohammad Join Date: Dec 2010 Location: UK Posts: 245 Rep Power: 16	Dear Glenn Horrocks. Thank you for your help. To those how may read this page later: The transitional model is available in CFX-11. And the details are presented in "ANSYS CFX Transition Model Formulation " section of Ansys help. Also if you see the above help pages , you will see it's similar with the Menter[AIAA-2006] paper. it means that the in CFX-11 the cited paper is used. Good Luck