CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Cd one more time...

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

LinkBack Thread Tools Display Modes
Old   December 15, 2006, 10:52
Default Cd one more time...
Posts: n/a
Hi all, Itīs seems like determine the Cd is a hell, for at least, many of us. I looked in this forum many, many posts, but couldnīt solve my problem. Itīs simple, a 2d airfoil with a structured (good resolution) mesh. With boundary layer with a proper y+ for the turbulence model, references values ok, etc, etc. The reynolds I need to calculate is 1.5 million, 1 unit of airfoil chord. I can get the Cl with no problem but I donīt know what to do with cd and cp (cp gave me inverted). Can you help me please? What other things should I do? For example, what do you recomend? far-field pressure, press inlet or velocity inlet? (remember the Re number, very low to be compresible flow (120km/h)). I used SA turb. model, what are the settings for that model? I made two meshes, one with <1 y+ and other with 30 y+, like the fluent docs says. Also, for the Cp, it ask me the moment center that is located at x=0.25 and y=0 but the result was inverted (the cp for that airfoil have to be negative at 0 AOA, but I got the same number but positive.

Plase help!

Thanks for your time.
  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
Time step size and max iterations per time step pUl| FLUENT 31 August 21, 2015 04:46
Multiple floating objects CKH OpenFOAM 10 September 21, 2011 23:13
Time step in transient simulation shib FLUENT 0 June 17, 2010 13:07
PostChannel maka OpenFOAM Post-Processing 5 July 22, 2009 09:15
Computational time sunnysun OpenFOAM Running, Solving & CFD 5 March 16, 2009 04:32

All times are GMT -4. The time now is 02:40.