CFD Online Logo CFD Online URL
Home > Forums > FLUENT


Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Display Modes
Old   November 10, 2005, 14:53
Default Units GAMBIT
Posts: n/a
I would like to work with inches in gambit but I have trouble setting the untis I think I am currently in mm and afterward I put it in fluent and i would also like to mesure un inch. Now the fluent softwar is in m all my units are mixed and I cant get good value because of that. Can you tell me how to change my units in both sofwart.

One more question: how is it possible to obtaine Cl and Cd max in fluent for an airfoild in 2_d

Last question: is it better to use k-epsilone or k-omega to calculate in my aifoild.


Virginie Brisebois
  Reply With Quote

Old   November 10, 2005, 15:11
Default Re: Units GAMBIT
Posts: n/a

In Gambit you are working with dimensionless units, you have to specify mesh units in Fluent in Grid - Scale.

  Reply With Quote

Old   November 10, 2005, 18:37
Default Re: Units GAMBIT
Posts: n/a
You can also display what units you want to see in Fluent by going to Define->Units. You still need to scale your grid like Michal said, but this way you can use british units in your boundary conditions, reference values, etc., and also get british units back when looking at the results (like when plotting contours for example).

Fluent doesn't have an automated way of getting CL and CD max. Depending on how you define your boundary conditions, you can change the flow direction, and do this for several angles of attack. Record your values for CL and CD at each AoA in excel or something, and that way you can see the trends vs. AoA. You could do this with a UDF as well (where you vary the boundary conditions and record the CL and CD).

I've seen decent results with k-e realizable and k-w SST (don't use the standard k-e or standard k-w though). The Spallart-Almaras model has the best track record with 2D, steady-state airfoils, as long as you're staying away from stall, and you're paying attention to your y+ values.

Hope this helps, and good luck, Jason
  Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
changing units in gambit Brendan FLUENT 2 August 13, 2012 09:12
Gambit 2.3.16, Xming or Exceed...HELP! bambam3417 FLUENT 10 May 7, 2010 12:39
Units in Gambit........... binubtharayil FLUENT 3 August 18, 2009 04:07
Change Units System in Gambit (microfluidic) djalil FLUENT 0 December 13, 2008 11:53
Gambit -dev X11 doesn't work Ervin Amet FLUENT 0 October 28, 2007 09:33

All times are GMT -4. The time now is 14:31.