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-   -   Comparison of fluent and CFX for turbomachinery (https://www.cfd-online.com/Forums/cfx/88076-comparison-fluent-cfx-turbomachinery.html)

Far May 27, 2011 08:52
Quote:
Originally Posted by ghorrocks (Post 309492)
Well, the segregated solver does not introduce errors - it just has a looser coupling between the momentum and pressure/mass equation and therefore if the coupling is tricky it makes convergence more difficult. A properly converged segregated solver will be as accurate as a equivalently converged coupled solver.

Segregated solvers iterate much faster, so for cases where the tight coupling is not so important they are superior. For instance you will find segregated solvers often out-perform coupled solvers in transient simulations.
yes you are right

chameco August 29, 2011 09:28
Hello Far,

How you simulated in CFX using the S-A turbulence model? As I know S-A is not implemented in the CFX Solver

Far September 5, 2011 07:26
ya I did. It is implemented as the Beta Feature, and can be activated in CFX Pre

Far September 7, 2011 15:08
any success in using SA model ?

chameco September 7, 2011 15:50
No. Do you refer in CFX pre Beta version is implemented?

I read all the CFX manuals and did not find anything about S-A model. Just one model of one equation developed by Menter.

Thank's

Far September 8, 2011 06:24
Check out this pdf file and you find that SA model is implemented in CFX (from CFX 11 and still as beta in V 13)
http://www1.ansys.com/customer/userg...2.0-update.pdf

Far September 8, 2011 06:43
http://www.ansys.com/staticassets/AN...tech-specs.pdf


it surely contains the reference that CFX has SA model as beta feature. It should be noted that there are no details given in CFX help regarding beta features.

chameco September 14, 2011 15:24
Nice. I will try to find the beta feature.

Thank's a lot.

Far September 14, 2011 16:28
2 Attachment(s)
it is very much simple. Attached files describe how to activate the beta features

mm.abdollahzadeh April 3, 2012 21:08
Hi Far

I am trying to model NASA Rotor 67 with fluent . but I have alot of problem. I can obtain the correct pressuare ratio for near pick efficny but in other cases i am not able.
Could please give me more information about you fluent case setup of NASA Rotor 37 ? in fact i dont have the grid coordinates and the experimental datas for Nasa Rotor 37to start modelling that.

I will be too much thankful to recive your help and suggestions

Best
Mehdi

sehs15 December 22, 2014 05:21
which type of boundary conditions did you use in FLUENT? did you use turbo specific non-reflecting BC ?

Far December 25, 2014 13:54
These were standard boundary conditions

JuPa December 26, 2014 18:11
This is actually a fantastic and informative thread.


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