CFD Online Logo CFD Online URL
Home > Forums > FLUENT

overpredicted lift and stall angle

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

LinkBack Thread Tools Display Modes
Old   November 15, 2009, 10:06
Default overpredicted lift and stall angle
New Member
Join Date: Sep 2009
Posts: 7
Rep Power: 9
student123a is on a distinguished road
hi everyone!
im conducting a CFD experiment for my thesis and have some errors in my results.
Im comparing wind tunnel results and Fluent results for a Naca airfoil. In the wind tunnel, the airfoil (infinite test) was stalling at 14 degrees and max Cl 1.5 . however, fluent is over prediciting these stalling angle of 17 degrees and max cl of 1.9. im preforming the test at low Reynolds numbers (1.5 million)

Is there any reason for the over-predicted values from fluent? i have a very good mesh constructed by an experienced fluent user so i know that is not causing the problem.
(model used: K-E, RNG)

many thanks
student123a is offline   Reply With Quote

Old   November 16, 2009, 13:12
Felipe Gutiérrez Donoso
Join Date: Mar 2009
Posts: 31
Rep Power: 10
Figd84 is on a distinguished road
Try using LES turbulence model if there is any change.

Often that kind of problem respond to turbulence model issues.

Also, check the turbulence boundary conditions.
Figd84 is offline   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
stall simulation Kevin Lamers FloEFD, FloWorks & FloTHERM 1 January 29, 2009 07:24
Thin foil analsis (sail) - Lift Coeff Problem Kelvin CFX 3 December 22, 2008 17:22
Calculation of lift and drag coefficients Prachi CFX 3 August 14, 2007 14:05
Modelling flow over airfoil at near stall angle Kelvin FLUENT 5 June 6, 2007 02:00
static stall atrh Main CFD Forum 1 March 9, 2004 07:07

All times are GMT -4. The time now is 16:20.