Comparison of fluent and CFX for turbomachinery

Far · May 27, 2011, 08:52

Quote:

Originally Posted by ghorrocks

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

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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August 29, 2011, 09:28		#42
chameco New Member Diego Thomas Join Date: Jan 2011 Posts: 4 Rep Power: 15	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

September 5, 2011, 07:26		#43
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	ya I did. It is implemented as the Beta Feature, and can be activated in CFX Pre

September 7, 2011, 15:08		#44
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	any success in using SA model ?

September 7, 2011, 15:50		#45
chameco New Member Diego Thomas Join Date: Jan 2011 Posts: 4 Rep Power: 15	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

September 8, 2011, 06:24		#46
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	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

September 8, 2011, 06:43		#47
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	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.

September 14, 2011, 15:24		#48
chameco New Member Diego Thomas Join Date: Jan 2011 Posts: 4 Rep Power: 15	Nice. I will try to find the beta feature. Thank's a lot.

April 3, 2012, 21:08		#50
mm.abdollahzadeh Senior Member mahdi abdollahzadeh Join Date: Mar 2011 Location: Covilha,Portugal Posts: 153 Rep Power: 15	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

December 22, 2014, 05:21		#51
sehs15 New Member mohamed mohsen Join Date: Oct 2012 Posts: 29 Rep Power: 13	which type of boundary conditions did you use in FLUENT? did you use turbo specific non-reflecting BC ?

December 25, 2014, 13:54		#52
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	These were standard boundary conditions

December 26, 2014, 18:11		#53
JuPa Senior Member Mr CFD Join Date: Jun 2012 Location: Britain Posts: 361 Rep Power: 14	This is actually a fantastic and informative thread.