CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Main CFD Forum

CFD vs Experimetal Results for Aerofoil

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

Reply
 
LinkBack Thread Tools Display Modes
Old   March 25, 2010, 08:05
Default CFD vs Experimetal Results for Aerofoil
  #1
New Member
 
owhelan
Join Date: Mar 2010
Posts: 3
Rep Power: 7
owhelan is on a distinguished road
Hi, I'm comparing experimental results obtained for a NACA 0012 aerofoil in a wind tunnel with CFD results ran on Fluent.

The CFD model was a very simple 2D, steady time, incompressible model using k-epsilon and standard wall functions. BC's were a pressure inlet and outlet and symmetry on upper/lower surfaces or fluid domain.

Despite the low inlet gauge pressure of 215pa, I'm getting pressure readings on the surface of the aerofoil that lead to pressure coefficients greater than +ve 1 on the pressure surface at 9 deg and 12 deg incidence.

Can anyone explain why this may be happening? Is it a problem with the wall function?

Thanks
Osh
owhelan is offline   Reply With Quote

Old   March 25, 2010, 10:12
Default
  #2
New Member
 
Karatix
Join Date: Sep 2009
Posts: 22
Rep Power: 7
Karatix is on a distinguished road
What CFD Package and mesh generator do you use?
Karatix is offline   Reply With Quote

Old   March 25, 2010, 10:15
Default
  #3
New Member
 
owhelan
Join Date: Mar 2010
Posts: 3
Rep Power: 7
owhelan is on a distinguished road
I an using GAMBIT to generate the mesh and FLUENT to run the simulation.
owhelan is offline   Reply With Quote

Old   March 25, 2010, 11:54
Default
  #4
New Member
 
Karatix
Join Date: Sep 2009
Posts: 22
Rep Power: 7
Karatix is on a distinguished road
Unfortuntately I am not using Gambit and Fluent anymore and cannot remember whether I had similar problems. I think I used a structured grid without a wall function. The turbulence model was Spalart Allmares and worked pretty well.

Have you got subsonic, transonic or supersonic flow?

Does it have a great difference between the value and +1?
Karatix is offline   Reply With Quote

Reply

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
Comparison of experimental and CFD results for the VA-2 supercritical airfoil Aurélien FLUENT 1 May 6, 2013 09:44
CFD vs Experimetal Results for Aerofoil owhelan FLUENT 0 March 25, 2010 08:03
DOES ASPECT RATIO PLAY A PART IN CFD RESULTS? RIF Main CFD Forum 2 January 5, 2008 14:14
ASME CFD Symposium Chris Kleijn Main CFD Forum 0 August 22, 2001 06:41
Can we quantify the fruits of CFD? Brady Brown Main CFD Forum 14 December 15, 1999 10:42


All times are GMT -4. The time now is 23:24.